4.0L overheating
#31
Guest
Posts: n/a
Re: 4.0L overheating
Roughly 1/24/04 18:50, Ryan's monkeys randomly typed:
> I don't think I'm turning the pump backwards because I bought the belt
> for the 96 ZJ. Plus, all the grooved pullies are touching the grooved
> ide of the belt. I'll doublecheck it though. Thanks.
The pump should have had an "R" stamped on the impeller. The
pump should be turning widdershins [counterclockwise] as viewed
from the front of the engine. The '95 FSM also notes that the
viscous fan clutch is unique for the 4.0 in the ZJ's.
The temp sensor at the thermostat housing has a chart of
temperature versus resistance that you can check with a
cheap meter.
32 F 29.3K to 35.9K ohm
68 F 11.3K to 13.6K ohm
140 F 2.3K to 2.7K ohm
194 F 860 ohm to 970 ohm
212 F 640 ohm to 720 ohm
With the general statement that the temp sensor should read
less than 1K [1,000] ohms with the engine at normal operating
temp... about 190 degrees.
--
Now that Spirit Rover has confirmed the presence of weapons of
mass destruction on Mars, we are preparing to invade...
> I don't think I'm turning the pump backwards because I bought the belt
> for the 96 ZJ. Plus, all the grooved pullies are touching the grooved
> ide of the belt. I'll doublecheck it though. Thanks.
The pump should have had an "R" stamped on the impeller. The
pump should be turning widdershins [counterclockwise] as viewed
from the front of the engine. The '95 FSM also notes that the
viscous fan clutch is unique for the 4.0 in the ZJ's.
The temp sensor at the thermostat housing has a chart of
temperature versus resistance that you can check with a
cheap meter.
32 F 29.3K to 35.9K ohm
68 F 11.3K to 13.6K ohm
140 F 2.3K to 2.7K ohm
194 F 860 ohm to 970 ohm
212 F 640 ohm to 720 ohm
With the general statement that the temp sensor should read
less than 1K [1,000] ohms with the engine at normal operating
temp... about 190 degrees.
--
Now that Spirit Rover has confirmed the presence of weapons of
mass destruction on Mars, we are preparing to invade...
#32
Guest
Posts: n/a
Re: 4.0L overheating
Thanks everyone for the excellent advice. Just thought I'd update you
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
#33
Guest
Posts: n/a
Re: 4.0L overheating
Thanks everyone for the excellent advice. Just thought I'd update you
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
#34
Guest
Posts: n/a
Re: 4.0L overheating
Thanks everyone for the excellent advice. Just thought I'd update you
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
with my findings.
It looks like the apparent overheating was because of a fault with the
gauge itself. I determined this after turning the key to the "on"
position and checking the gauge with the engine cold. It read 160
degrees. I unplugged the temperature sender (both of them). Still 160
degrees. The weird part is that after grounding the temperature sensor
wire and pegging the gauge for a few moments, it appears to be working
fine. Go figure.
Also thought I'd let you know what I figured out on the position of the
senders. Apparently the 93 YJ has two *different* coolant temperature
senders. One is a switch in the thermostat housing for the computer and
the other is a thermistor in the traditional spot in the head by the
firewall (this one is for the gauge).
Again, thanks for the help.
Also, if anyone has any questions on the 4L swap into an early YJ let me
know and I'll offer what advice I can.
Ryan
Ryan wrote:
> Hi,
>
> I'm having a weird overheating problem and I need a little help. First,
> the details. I have an 87 YJ and I just finished putting a 4.0L into it
> from a 96 ZJ donor. The swap went well except that the motor "appears"
> to be overheating. I am running the new engine with my original radiator
> (never had heat problems before).
>
> After running it for a few minutes the temp gauge starts to climb up
> towards red line. However, the engine shows no physical signs of
> overheating. I can touch the head (front and back) and it's not very hot
> at all. Also, I can open the radiator cap and actually stick my finger
> in the coolant for a second or so. The is all while the temp gauge is
> reading about 210-220.
>
> I thought perhaps the coolant wasn't flowing, but I felt the large hose
> on top and the two hoses to and from the heater core. All three were
> pretty warm. The bottom radiator hose was warm too, but not as warm as
> the top hose (I think). Also the radiator itself was pretty warm
> indicating at least some circulation.
>
> I've put the front wheels on ramps in case I had an air bubble in the
> pump, but it didn't help any. Also, I looked in the radiator while the
> engine was running, and couldn't really see fluid flowing. Should I be
> able to see this?
>
> Final notes - I have a bit of belt squeal at initial startup, but all
> the pullies are moving. Also, keep in mind that all this is happening in
> 15* degree weather.
>
> What do you guys think? Any ideas? Your help is greatly appreciated.
>
> Ryan
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