overheating 258 HELP!
02-09-2004, 10:29 AM
#21
Guest
Posts: n/a
Re: overheating 258 HELP!
If a 160 is the only way yo keep the temp down, I would guess you have a
blown head gasket.
I would try heating it up with the rad cap off and watch for many tiny
bubbles and smoke coming out the hole or a major explosion of fluid when
the t-stat opens.
On some, once the thermostat has opened you can put your hand over the
opening and feel the puffs of compression.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
blown head gasket.
I would try heating it up with the rad cap off and watch for many tiny
bubbles and smoke coming out the hole or a major explosion of fluid when
the t-stat opens.
On some, once the thermostat has opened you can put your hand over the
opening and feel the puffs of compression.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
02-09-2004, 10:29 AM
#22
Guest
Posts: n/a
Re: overheating 258 HELP!
If a 160 is the only way yo keep the temp down, I would guess you have a
blown head gasket.
I would try heating it up with the rad cap off and watch for many tiny
bubbles and smoke coming out the hole or a major explosion of fluid when
the t-stat opens.
On some, once the thermostat has opened you can put your hand over the
opening and feel the puffs of compression.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
blown head gasket.
I would try heating it up with the rad cap off and watch for many tiny
bubbles and smoke coming out the hole or a major explosion of fluid when
the t-stat opens.
On some, once the thermostat has opened you can put your hand over the
opening and feel the puffs of compression.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
02-09-2004, 01:14 PM
#23
Guest
Posts: n/a
Re: overheating 258 HELP!
You have to be sure that you have the right waterpump.
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
02-09-2004, 01:14 PM
#24
Guest
Posts: n/a
Re: overheating 258 HELP!
You have to be sure that you have the right waterpump.
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
02-09-2004, 01:14 PM
#25
Guest
Posts: n/a
Re: overheating 258 HELP!
You have to be sure that you have the right waterpump.
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
There is a version for the Vbelt and another version for the serpentine
belt. They spin backwards from each other. If yo have a serpentine belt
conversion, but use the vbelt water pump, or vice versa, the impeller on the
pump will be reversed and the coolant will not flow very well.
You could also have a stuck tstat.
"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>
02-09-2004, 01:16 PM
#26
Guest
Posts: n/a
Re: overheating 258 HELP!
My '81 258 (4.2L) has no shroud either. I also have no fan clutch, which
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
02-09-2004, 01:16 PM
#27
Guest
Posts: n/a
Re: overheating 258 HELP!
My '81 258 (4.2L) has no shroud either. I also have no fan clutch, which
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
02-09-2004, 01:16 PM
#28
Guest
Posts: n/a
Re: overheating 258 HELP!
My '81 258 (4.2L) has no shroud either. I also have no fan clutch, which
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
presents its own issues, but overheating isn't any of them.
"Greg" <greglc84@hotmail.com> wrote in message
news:ntNVb.450241$X%5.443585@pd7tw2no...
> I have an 81 CJ7 258 too, no fan shroud.
>
> "Cherokee-LTD" <spammenot@home.com> wrote in message
> news:PFFVb.42744$3YE1.25320@news04.bloor.is.net.ca ble.rogers.com...
> > Put the fan shroud back on, the shroud will make a big difference at
idle
> > and low speed.
> > -Brian
> >
> > "brad smith" <bradley_k_smith@hotmaill.com> wrote in message
> > news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> > : My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > : it is always running at the very end of the green band in the
> > : winter and last summer was on the H line. After driving it I can
> > : hear the coolant bubbling in the system and the radiator cap will
> > : have it's vent popped. I have replaced the water pump, fan
> > : clutch, hoses, temperature sending unit, temperature gauge in
> > : spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > : (using 160 now, only way to "keep it in the green") and had
> > : radiator steam cleaned. It still seams to be running hot even in
> > : Kansas City's 20-30 F weather we are having now. I don't see any
> > : coolant in the oil and there doesn't seem to be any burn off.
> > :
> > : I did have to run a wire direct from the sending unit to the
> > : gauge - my Painless harness has a break in the temp wire (not
> > : that it matters). I do not have a fan shroud. I have run out of
> > : things to replace and I am still running hot. My only thoughts
> > : are that my aftermarket products are causing to much heat in the
> > : combustion chamber or to much carbon build-up inside the engine.
> > :
> > : Thoughts?
> > :
> > : Also - I am planning on the 4.0 head swap in the near future -
> > : any suggestions on where to get a head and what casting I should
> > : look for?
> > :
> > : Thanks for looking
> > : Brad
> > :
> > : P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > : headers, GM HEI distributor, stock heat range spark plugs, aprox
> > : 95,000 miles.
> > :
> > :
> >
> >
>
>
02-09-2004, 01:17 PM
#29
Guest
Posts: n/a
Re: overheating 258 HELP!
If he had a bad head gasket though, wouldn't he have oil and coolant mixed
in either the crankcase or the radiator, or both?
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4027A73F.FC2A6C97@sympatico.ca...
> If a 160 is the only way yo keep the temp down, I would guess you have a
> blown head gasket.
>
> I would try heating it up with the rad cap off and watch for many tiny
> bubbles and smoke coming out the hole or a major explosion of fluid when
> the t-stat opens.
>
> On some, once the thermostat has opened you can put your hand over the
> opening and feel the puffs of compression.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> brad smith wrote:
> >
> > My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > it is always running at the very end of the green band in the
> > winter and last summer was on the H line. After driving it I can
> > hear the coolant bubbling in the system and the radiator cap will
> > have it's vent popped. I have replaced the water pump, fan
> > clutch, hoses, temperature sending unit, temperature gauge in
> > spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > (using 160 now, only way to "keep it in the green") and had
> > radiator steam cleaned. It still seams to be running hot even in
> > Kansas City's 20-30 F weather we are having now. I don't see any
> > coolant in the oil and there doesn't seem to be any burn off.
> >
> > I did have to run a wire direct from the sending unit to the
> > gauge - my Painless harness has a break in the temp wire (not
> > that it matters). I do not have a fan shroud. I have run out of
> > things to replace and I am still running hot. My only thoughts
> > are that my aftermarket products are causing to much heat in the
> > combustion chamber or to much carbon build-up inside the engine.
> >
> > Thoughts?
> >
> > Also - I am planning on the 4.0 head swap in the near future -
> > any suggestions on where to get a head and what casting I should
> > look for?
> >
> > Thanks for looking
> > Brad
> >
> > P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > headers, GM HEI distributor, stock heat range spark plugs, aprox
> > 95,000 miles.
in either the crankcase or the radiator, or both?
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4027A73F.FC2A6C97@sympatico.ca...
> If a 160 is the only way yo keep the temp down, I would guess you have a
> blown head gasket.
>
> I would try heating it up with the rad cap off and watch for many tiny
> bubbles and smoke coming out the hole or a major explosion of fluid when
> the t-stat opens.
>
> On some, once the thermostat has opened you can put your hand over the
> opening and feel the puffs of compression.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> brad smith wrote:
> >
> > My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > it is always running at the very end of the green band in the
> > winter and last summer was on the H line. After driving it I can
> > hear the coolant bubbling in the system and the radiator cap will
> > have it's vent popped. I have replaced the water pump, fan
> > clutch, hoses, temperature sending unit, temperature gauge in
> > spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > (using 160 now, only way to "keep it in the green") and had
> > radiator steam cleaned. It still seams to be running hot even in
> > Kansas City's 20-30 F weather we are having now. I don't see any
> > coolant in the oil and there doesn't seem to be any burn off.
> >
> > I did have to run a wire direct from the sending unit to the
> > gauge - my Painless harness has a break in the temp wire (not
> > that it matters). I do not have a fan shroud. I have run out of
> > things to replace and I am still running hot. My only thoughts
> > are that my aftermarket products are causing to much heat in the
> > combustion chamber or to much carbon build-up inside the engine.
> >
> > Thoughts?
> >
> > Also - I am planning on the 4.0 head swap in the near future -
> > any suggestions on where to get a head and what casting I should
> > look for?
> >
> > Thanks for looking
> > Brad
> >
> > P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > headers, GM HEI distributor, stock heat range spark plugs, aprox
> > 95,000 miles.
02-09-2004, 01:17 PM
#30
Guest
Posts: n/a
Re: overheating 258 HELP!
If he had a bad head gasket though, wouldn't he have oil and coolant mixed
in either the crankcase or the radiator, or both?
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4027A73F.FC2A6C97@sympatico.ca...
> If a 160 is the only way yo keep the temp down, I would guess you have a
> blown head gasket.
>
> I would try heating it up with the rad cap off and watch for many tiny
> bubbles and smoke coming out the hole or a major explosion of fluid when
> the t-stat opens.
>
> On some, once the thermostat has opened you can put your hand over the
> opening and feel the puffs of compression.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> brad smith wrote:
> >
> > My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > it is always running at the very end of the green band in the
> > winter and last summer was on the H line. After driving it I can
> > hear the coolant bubbling in the system and the radiator cap will
> > have it's vent popped. I have replaced the water pump, fan
> > clutch, hoses, temperature sending unit, temperature gauge in
> > spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > (using 160 now, only way to "keep it in the green") and had
> > radiator steam cleaned. It still seams to be running hot even in
> > Kansas City's 20-30 F weather we are having now. I don't see any
> > coolant in the oil and there doesn't seem to be any burn off.
> >
> > I did have to run a wire direct from the sending unit to the
> > gauge - my Painless harness has a break in the temp wire (not
> > that it matters). I do not have a fan shroud. I have run out of
> > things to replace and I am still running hot. My only thoughts
> > are that my aftermarket products are causing to much heat in the
> > combustion chamber or to much carbon build-up inside the engine.
> >
> > Thoughts?
> >
> > Also - I am planning on the 4.0 head swap in the near future -
> > any suggestions on where to get a head and what casting I should
> > look for?
> >
> > Thanks for looking
> > Brad
> >
> > P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > headers, GM HEI distributor, stock heat range spark plugs, aprox
> > 95,000 miles.
in either the crankcase or the radiator, or both?
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4027A73F.FC2A6C97@sympatico.ca...
> If a 160 is the only way yo keep the temp down, I would guess you have a
> blown head gasket.
>
> I would try heating it up with the rad cap off and watch for many tiny
> bubbles and smoke coming out the hole or a major explosion of fluid when
> the t-stat opens.
>
> On some, once the thermostat has opened you can put your hand over the
> opening and feel the puffs of compression.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> brad smith wrote:
> >
> > My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> > it is always running at the very end of the green band in the
> > winter and last summer was on the H line. After driving it I can
> > hear the coolant bubbling in the system and the radiator cap will
> > have it's vent popped. I have replaced the water pump, fan
> > clutch, hoses, temperature sending unit, temperature gauge in
> > spedo cluster, 15# radiator cap, thermostat housing, thermostat
> > (using 160 now, only way to "keep it in the green") and had
> > radiator steam cleaned. It still seams to be running hot even in
> > Kansas City's 20-30 F weather we are having now. I don't see any
> > coolant in the oil and there doesn't seem to be any burn off.
> >
> > I did have to run a wire direct from the sending unit to the
> > gauge - my Painless harness has a break in the temp wire (not
> > that it matters). I do not have a fan shroud. I have run out of
> > things to replace and I am still running hot. My only thoughts
> > are that my aftermarket products are causing to much heat in the
> > combustion chamber or to much carbon build-up inside the engine.
> >
> > Thoughts?
> >
> > Also - I am planning on the 4.0 head swap in the near future -
> > any suggestions on where to get a head and what casting I should
> > look for?
> >
> > Thanks for looking
> > Brad
> >
> > P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> > headers, GM HEI distributor, stock heat range spark plugs, aprox
> > 95,000 miles.
