That has the AMC 360 right?

http://amccf.com/tech/v8_specs.html



"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
> Any one got the specs for a compression check on a 360 v8 '91 ?
>
> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> cylinders.
> I would have expected about 140-160 psi and am a bit surprised it is so
> consisently low. That was a dry test - didn't do a wet one.
>
> Dave Milne, Scotland '91 Wagoneer
>
>

 

That has the AMC 360 right?

http://amccf.com/tech/v8_specs.html



"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
> Any one got the specs for a compression check on a 360 v8 '91 ?
>
> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> cylinders.
> I would have expected about 140-160 psi and am a bit surprised it is so
> consisently low. That was a dry test - didn't do a wet one.
>
> Dave Milne, Scotland '91 Wagoneer
>
>

 

That has the AMC 360 right?

http://amccf.com/tech/v8_specs.html



"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
> Any one got the specs for a compression check on a 360 v8 '91 ?
>
> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> cylinders.
> I would have expected about 140-160 psi and am a bit surprised it is so
> consisently low. That was a dry test - didn't do a wet one.
>
> Dave Milne, Scotland '91 Wagoneer
>
>

 

Here is what the coolant will look like if you have a blown headgasket
and warm it up with no cap on:

http://www.imagestation.com/album/pi...?id=4290636987

Mike

Dave Milne wrote:
>
> Cheers Mike - inline !
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:45293415.B87F702@sympatico.ca...
> > If you are burning the water, the spark plug in that cylinder will look
> > like new.
>
> No, they are all a nice shade of light brown.
>
> > How old is the rad cap? A bad one can let too much water into the
> > overflow and not suck it back when it cools down. So can a leak in the
> > line from the rad to the overflow. It might not drip when the coolant
> > is coming out of the rad as it warms up, but it might allow air to be
> > sucked back in when the system is supposed to be sucking coolant back as
> > it cools down.
>
> The rad cap is approx 2 years old. I only use the vehicle at weekends, so
> has done less than
> 600 miles in that time (was doing it up). Don't think the expansion line is
> bad, but it is
> cheap enough to replace on a whim.
>
> > Even if it fills the overflow, when the rad cap is working, it will
> > 'unfill' it as it cools down. If not it is a bad cap or air leak.
>
> That didn't happen.The top of the radiator was low by 1/2". Will get another
> cap as well, I guess.
>
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > (More Off Road album links at bottom of the view page)
> >
> > Dave Milne wrote:
> > >
> > > Hi Carl,
> > > Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> > > Trouble is, I think something is pressurising the coolant and I can't
> work
> > > out what it is. Cylinder pressures are uniform, no steam coming out the
> > > exhaust, no mayo in the oil, no oil in the water. Everything points to
> not
> > > having a problem were it not for the fact water is coming out of the
> > > expansion tank ! Occams Razor says it is me replacing the inlet manifold
> 3
> > > weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> > > Felpro gaskets both times with RTV around both sides of the gaskets
> around
> > > the water jackets and exhaust as per instructions), and that didn't
> solve
> > > the problem.
> > >
> > > "Slightly baffled" Dave
> > >
> > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > Dave,
> > > >
> > > > Was the engine warm or cold? I'll second the uniformity. So long
> as
> > > they
> > > > are all close to 8 bar, I wouldn't really worry about it. You can try
> > > > putting a few drops of oil in each cylinder and trying the test again.
> If
> > > > the numbers rise your rings are a worn.
> > > >
> > > > However, with 8bar and uniformity, I wouldn't worry.
> > > >
> > > > Carl
> > > >
> > > >
> > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > Thanks Doug & Earle.
> > > > >
> > > > > Dave
> > > > >
> > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > >> Dave Milne wrote:
> > > > >> > Any one got the specs for a compression check on a 360 v8 '91 ?
> > > > >>
> > > > >> Got me. 160 is "normal" for the I6, but it has a higher compression
> > > > >> rating than the V8.
> > > > >>
> > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> > > > >> > cylinders. I would have expected about 140-160 psi and am a bit
> > > > >> > surprised it is so consisently low. That was a dry test - didn't
> do a
> > > > >> > wet one.
> > > > >>
> > > > >> Consistency (psi +- 10%) is what your looking for in a compression
> > > test.
> > > > >>
> > > > >> - Run the engine till it gets warm to the touch.
> > > > >> - I find it easier on the battery with all the plugs out.
> > > > >> - Hold the throttle all the way open or the engine won't breathe.
> > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > >>
> > > > >> FWIW, I do a compression test each time I change plugs. Except
> this
> > > > >> time, the hose on my compression tester sprang a leak. :( 160-165
> is
> > > > >> what the I6 gets when warm.
> > > > >>
> > > > >> --
> > > > >> DougW
> > > > >>
> > > > >>
> > > > >
> > > > >
> > > >
> > > >

 

Here is what the coolant will look like if you have a blown headgasket
and warm it up with no cap on:

http://www.imagestation.com/album/pi...?id=4290636987

Mike

Dave Milne wrote:
>
> Cheers Mike - inline !
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:45293415.B87F702@sympatico.ca...
> > If you are burning the water, the spark plug in that cylinder will look
> > like new.
>
> No, they are all a nice shade of light brown.
>
> > How old is the rad cap? A bad one can let too much water into the
> > overflow and not suck it back when it cools down. So can a leak in the
> > line from the rad to the overflow. It might not drip when the coolant
> > is coming out of the rad as it warms up, but it might allow air to be
> > sucked back in when the system is supposed to be sucking coolant back as
> > it cools down.
>
> The rad cap is approx 2 years old. I only use the vehicle at weekends, so
> has done less than
> 600 miles in that time (was doing it up). Don't think the expansion line is
> bad, but it is
> cheap enough to replace on a whim.
>
> > Even if it fills the overflow, when the rad cap is working, it will
> > 'unfill' it as it cools down. If not it is a bad cap or air leak.
>
> That didn't happen.The top of the radiator was low by 1/2". Will get another
> cap as well, I guess.
>
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > (More Off Road album links at bottom of the view page)
> >
> > Dave Milne wrote:
> > >
> > > Hi Carl,
> > > Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> > > Trouble is, I think something is pressurising the coolant and I can't
> work
> > > out what it is. Cylinder pressures are uniform, no steam coming out the
> > > exhaust, no mayo in the oil, no oil in the water. Everything points to
> not
> > > having a problem were it not for the fact water is coming out of the
> > > expansion tank ! Occams Razor says it is me replacing the inlet manifold
> 3
> > > weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> > > Felpro gaskets both times with RTV around both sides of the gaskets
> around
> > > the water jackets and exhaust as per instructions), and that didn't
> solve
> > > the problem.
> > >
> > > "Slightly baffled" Dave
> > >
> > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > Dave,
> > > >
> > > > Was the engine warm or cold? I'll second the uniformity. So long
> as
> > > they
> > > > are all close to 8 bar, I wouldn't really worry about it. You can try
> > > > putting a few drops of oil in each cylinder and trying the test again.
> If
> > > > the numbers rise your rings are a worn.
> > > >
> > > > However, with 8bar and uniformity, I wouldn't worry.
> > > >
> > > > Carl
> > > >
> > > >
> > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > Thanks Doug & Earle.
> > > > >
> > > > > Dave
> > > > >
> > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > >> Dave Milne wrote:
> > > > >> > Any one got the specs for a compression check on a 360 v8 '91 ?
> > > > >>
> > > > >> Got me. 160 is "normal" for the I6, but it has a higher compression
> > > > >> rating than the V8.
> > > > >>
> > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> > > > >> > cylinders. I would have expected about 140-160 psi and am a bit
> > > > >> > surprised it is so consisently low. That was a dry test - didn't
> do a
> > > > >> > wet one.
> > > > >>
> > > > >> Consistency (psi +- 10%) is what your looking for in a compression
> > > test.
> > > > >>
> > > > >> - Run the engine till it gets warm to the touch.
> > > > >> - I find it easier on the battery with all the plugs out.
> > > > >> - Hold the throttle all the way open or the engine won't breathe.
> > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > >>
> > > > >> FWIW, I do a compression test each time I change plugs. Except
> this
> > > > >> time, the hose on my compression tester sprang a leak. :( 160-165
> is
> > > > >> what the I6 gets when warm.
> > > > >>
> > > > >> --
> > > > >> DougW
> > > > >>
> > > > >>
> > > > >
> > > > >
> > > >
> > > >

 

Here is what the coolant will look like if you have a blown headgasket
and warm it up with no cap on:

http://www.imagestation.com/album/pi...?id=4290636987

Mike

Dave Milne wrote:
>
> Cheers Mike - inline !
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:45293415.B87F702@sympatico.ca...
> > If you are burning the water, the spark plug in that cylinder will look
> > like new.
>
> No, they are all a nice shade of light brown.
>
> > How old is the rad cap? A bad one can let too much water into the
> > overflow and not suck it back when it cools down. So can a leak in the
> > line from the rad to the overflow. It might not drip when the coolant
> > is coming out of the rad as it warms up, but it might allow air to be
> > sucked back in when the system is supposed to be sucking coolant back as
> > it cools down.
>
> The rad cap is approx 2 years old. I only use the vehicle at weekends, so
> has done less than
> 600 miles in that time (was doing it up). Don't think the expansion line is
> bad, but it is
> cheap enough to replace on a whim.
>
> > Even if it fills the overflow, when the rad cap is working, it will
> > 'unfill' it as it cools down. If not it is a bad cap or air leak.
>
> That didn't happen.The top of the radiator was low by 1/2". Will get another
> cap as well, I guess.
>
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > (More Off Road album links at bottom of the view page)
> >
> > Dave Milne wrote:
> > >
> > > Hi Carl,
> > > Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> > > Trouble is, I think something is pressurising the coolant and I can't
> work
> > > out what it is. Cylinder pressures are uniform, no steam coming out the
> > > exhaust, no mayo in the oil, no oil in the water. Everything points to
> not
> > > having a problem were it not for the fact water is coming out of the
> > > expansion tank ! Occams Razor says it is me replacing the inlet manifold
> 3
> > > weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> > > Felpro gaskets both times with RTV around both sides of the gaskets
> around
> > > the water jackets and exhaust as per instructions), and that didn't
> solve
> > > the problem.
> > >
> > > "Slightly baffled" Dave
> > >
> > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > Dave,
> > > >
> > > > Was the engine warm or cold? I'll second the uniformity. So long
> as
> > > they
> > > > are all close to 8 bar, I wouldn't really worry about it. You can try
> > > > putting a few drops of oil in each cylinder and trying the test again.
> If
> > > > the numbers rise your rings are a worn.
> > > >
> > > > However, with 8bar and uniformity, I wouldn't worry.
> > > >
> > > > Carl
> > > >
> > > >
> > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > Thanks Doug & Earle.
> > > > >
> > > > > Dave
> > > > >
> > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > >> Dave Milne wrote:
> > > > >> > Any one got the specs for a compression check on a 360 v8 '91 ?
> > > > >>
> > > > >> Got me. 160 is "normal" for the I6, but it has a higher compression
> > > > >> rating than the V8.
> > > > >>
> > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> > > > >> > cylinders. I would have expected about 140-160 psi and am a bit
> > > > >> > surprised it is so consisently low. That was a dry test - didn't
> do a
> > > > >> > wet one.
> > > > >>
> > > > >> Consistency (psi +- 10%) is what your looking for in a compression
> > > test.
> > > > >>
> > > > >> - Run the engine till it gets warm to the touch.
> > > > >> - I find it easier on the battery with all the plugs out.
> > > > >> - Hold the throttle all the way open or the engine won't breathe.
> > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > >>
> > > > >> FWIW, I do a compression test each time I change plugs. Except
> this
> > > > >> time, the hose on my compression tester sprang a leak. :( 160-165
> is
> > > > >> what the I6 gets when warm.
> > > > >>
> > > > >> --
> > > > >> DougW
> > > > >>
> > > > >>
> > > > >
> > > > >
> > > >
> > > >

 

Nothing like that fortunately. When I start it up, water just overflows the
top if the caps not on.

Dave

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4529497A.AA8E835C@sympatico.ca...
> Here is what the coolant will look like if you have a blown headgasket
> and warm it up with no cap on:
>
> http://www.imagestation.com/album/pi...?id=4290636987
>
> Mike
>
> Dave Milne wrote:
> >
> > Cheers Mike - inline !
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:45293415.B87F702@sympatico.ca...
> > > If you are burning the water, the spark plug in that cylinder will
look
> > > like new.
> >
> > No, they are all a nice shade of light brown.
> >
> > > How old is the rad cap? A bad one can let too much water into the
> > > overflow and not suck it back when it cools down. So can a leak in
the
> > > line from the rad to the overflow. It might not drip when the coolant
> > > is coming out of the rad as it warms up, but it might allow air to be
> > > sucked back in when the system is supposed to be sucking coolant back
as
> > > it cools down.
> >
> > The rad cap is approx 2 years old. I only use the vehicle at weekends,
so
> > has done less than
> > 600 miles in that time (was doing it up). Don't think the expansion line
is
> > bad, but it is
> > cheap enough to replace on a whim.
> >
> > > Even if it fills the overflow, when the rad cap is working, it will
> > > 'unfill' it as it cools down. If not it is a bad cap or air leak.
> >
> > That didn't happen.The top of the radiator was low by 1/2". Will get
another
> > cap as well, I guess.
> >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > > Canadian Off Road Trips Photos: Non members can still view!
> > > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > > (More Off Road album links at bottom of the view page)
> > >
> > > Dave Milne wrote:
> > > >
> > > > Hi Carl,
> > > > Engine was warm. Lowest reading was about 7.75 bar on one
cylinder
> > only.
> > > > Trouble is, I think something is pressurising the coolant and I
can't
> > work
> > > > out what it is. Cylinder pressures are uniform, no steam coming out
the
> > > > exhaust, no mayo in the oil, no oil in the water. Everything points
to
> > not
> > > > having a problem were it not for the fact water is coming out of the
> > > > expansion tank ! Occams Razor says it is me replacing the inlet
manifold
> > 3
> > > > weeks ago, but I've just redone the inlet manifold gasket yesterday
(new
> > > > Felpro gaskets both times with RTV around both sides of the gaskets
> > around
> > > > the water jackets and exhaust as per instructions), and that didn't
> > solve
> > > > the problem.
> > > >
> > > > "Slightly baffled" Dave
> > > >
> > > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > > Dave,
> > > > >
> > > > > Was the engine warm or cold? I'll second the uniformity. So
long
> > as
> > > > they
> > > > > are all close to 8 bar, I wouldn't really worry about it. You can
try
> > > > > putting a few drops of oil in each cylinder and trying the test
again.
> > If
> > > > > the numbers rise your rings are a worn.
> > > > >
> > > > > However, with 8bar and uniformity, I wouldn't worry.
> > > > >
> > > > > Carl
> > > > >
> > > > >
> > > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > > Thanks Doug & Earle.
> > > > > >
> > > > > > Dave
> > > > > >
> > > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > > >> Dave Milne wrote:
> > > > > >> > Any one got the specs for a compression check on a 360 v8 '91
?
> > > > > >>
> > > > > >> Got me. 160 is "normal" for the I6, but it has a higher
compression
> > > > > >> rating than the V8.
> > > > > >>
> > > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across
all
> > > > > >> > cylinders. I would have expected about 140-160 psi and am a
bit
> > > > > >> > surprised it is so consisently low. That was a dry test -
didn't
> > do a
> > > > > >> > wet one.
> > > > > >>
> > > > > >> Consistency (psi +- 10%) is what your looking for in a
compression
> > > > test.
> > > > > >>
> > > > > >> - Run the engine till it gets warm to the touch.
> > > > > >> - I find it easier on the battery with all the plugs out.
> > > > > >> - Hold the throttle all the way open or the engine won't
breathe.
> > > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > > >>
> > > > > >> FWIW, I do a compression test each time I change plugs. Except
> > this
> > > > > >> time, the hose on my compression tester sprang a leak. :(
160-165
> > is
> > > > > >> what the I6 gets when warm.
> > > > > >>
> > > > > >> --
> > > > > >> DougW
> > > > > >>
> > > > > >>
> > > > > >
> > > > > >
> > > > >
> > > > >

 

Nothing like that fortunately. When I start it up, water just overflows the
top if the caps not on.

Dave

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4529497A.AA8E835C@sympatico.ca...
> Here is what the coolant will look like if you have a blown headgasket
> and warm it up with no cap on:
>
> http://www.imagestation.com/album/pi...?id=4290636987
>
> Mike
>
> Dave Milne wrote:
> >
> > Cheers Mike - inline !
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:45293415.B87F702@sympatico.ca...
> > > If you are burning the water, the spark plug in that cylinder will
look
> > > like new.
> >
> > No, they are all a nice shade of light brown.
> >
> > > How old is the rad cap? A bad one can let too much water into the
> > > overflow and not suck it back when it cools down. So can a leak in
the
> > > line from the rad to the overflow. It might not drip when the coolant
> > > is coming out of the rad as it warms up, but it might allow air to be
> > > sucked back in when the system is supposed to be sucking coolant back
as
> > > it cools down.
> >
> > The rad cap is approx 2 years old. I only use the vehicle at weekends,
so
> > has done less than
> > 600 miles in that time (was doing it up). Don't think the expansion line
is
> > bad, but it is
> > cheap enough to replace on a whim.
> >
> > > Even if it fills the overflow, when the rad cap is working, it will
> > > 'unfill' it as it cools down. If not it is a bad cap or air leak.
> >
> > That didn't happen.The top of the radiator was low by 1/2". Will get
another
> > cap as well, I guess.
> >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > > Canadian Off Road Trips Photos: Non members can still view!
> > > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > > (More Off Road album links at bottom of the view page)
> > >
> > > Dave Milne wrote:
> > > >
> > > > Hi Carl,
> > > > Engine was warm. Lowest reading was about 7.75 bar on one
cylinder
> > only.
> > > > Trouble is, I think something is pressurising the coolant and I
can't
> > work
> > > > out what it is. Cylinder pressures are uniform, no steam coming out
the
> > > > exhaust, no mayo in the oil, no oil in the water. Everything points
to
> > not
> > > > having a problem were it not for the fact water is coming out of the
> > > > expansion tank ! Occams Razor says it is me replacing the inlet
manifold
> > 3
> > > > weeks ago, but I've just redone the inlet manifold gasket yesterday
(new
> > > > Felpro gaskets both times with RTV around both sides of the gaskets
> > around
> > > > the water jackets and exhaust as per instructions), and that didn't
> > solve
> > > > the problem.
> > > >
> > > > "Slightly baffled" Dave
> > > >
> > > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > > Dave,
> > > > >
> > > > > Was the engine warm or cold? I'll second the uniformity. So
long
> > as
> > > > they
> > > > > are all close to 8 bar, I wouldn't really worry about it. You can
try
> > > > > putting a few drops of oil in each cylinder and trying the test
again.
> > If
> > > > > the numbers rise your rings are a worn.
> > > > >
> > > > > However, with 8bar and uniformity, I wouldn't worry.
> > > > >
> > > > > Carl
> > > > >
> > > > >
> > > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > > Thanks Doug & Earle.
> > > > > >
> > > > > > Dave
> > > > > >
> > > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > > >> Dave Milne wrote:
> > > > > >> > Any one got the specs for a compression check on a 360 v8 '91
?
> > > > > >>
> > > > > >> Got me. 160 is "normal" for the I6, but it has a higher
compression
> > > > > >> rating than the V8.
> > > > > >>
> > > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across
all
> > > > > >> > cylinders. I would have expected about 140-160 psi and am a
bit
> > > > > >> > surprised it is so consisently low. That was a dry test -
didn't
> > do a
> > > > > >> > wet one.
> > > > > >>
> > > > > >> Consistency (psi +- 10%) is what your looking for in a
compression
> > > > test.
> > > > > >>
> > > > > >> - Run the engine till it gets warm to the touch.
> > > > > >> - I find it easier on the battery with all the plugs out.
> > > > > >> - Hold the throttle all the way open or the engine won't
breathe.
> > > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > > >>
> > > > > >> FWIW, I do a compression test each time I change plugs. Except
> > this
> > > > > >> time, the hose on my compression tester sprang a leak. :(
160-165
> > is
> > > > > >> what the I6 gets when warm.
> > > > > >>
> > > > > >> --
> > > > > >> DougW
> > > > > >>
> > > > > >>
> > > > > >
> > > > > >
> > > > >
> > > > >

 

Nothing like that fortunately. When I start it up, water just overflows the
top if the caps not on.

Dave

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4529497A.AA8E835C@sympatico.ca...
> Here is what the coolant will look like if you have a blown headgasket
> and warm it up with no cap on:
>
> http://www.imagestation.com/album/pi...?id=4290636987
>
> Mike
>
> Dave Milne wrote:
> >
> > Cheers Mike - inline !
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:45293415.B87F702@sympatico.ca...
> > > If you are burning the water, the spark plug in that cylinder will
look
> > > like new.
> >
> > No, they are all a nice shade of light brown.
> >
> > > How old is the rad cap? A bad one can let too much water into the
> > > overflow and not suck it back when it cools down. So can a leak in
the
> > > line from the rad to the overflow. It might not drip when the coolant
> > > is coming out of the rad as it warms up, but it might allow air to be
> > > sucked back in when the system is supposed to be sucking coolant back
as
> > > it cools down.
> >
> > The rad cap is approx 2 years old. I only use the vehicle at weekends,
so
> > has done less than
> > 600 miles in that time (was doing it up). Don't think the expansion line
is
> > bad, but it is
> > cheap enough to replace on a whim.
> >
> > > Even if it fills the overflow, when the rad cap is working, it will
> > > 'unfill' it as it cools down. If not it is a bad cap or air leak.
> >
> > That didn't happen.The top of the radiator was low by 1/2". Will get
another
> > cap as well, I guess.
> >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > > Canadian Off Road Trips Photos: Non members can still view!
> > > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> > > (More Off Road album links at bottom of the view page)
> > >
> > > Dave Milne wrote:
> > > >
> > > > Hi Carl,
> > > > Engine was warm. Lowest reading was about 7.75 bar on one
cylinder
> > only.
> > > > Trouble is, I think something is pressurising the coolant and I
can't
> > work
> > > > out what it is. Cylinder pressures are uniform, no steam coming out
the
> > > > exhaust, no mayo in the oil, no oil in the water. Everything points
to
> > not
> > > > having a problem were it not for the fact water is coming out of the
> > > > expansion tank ! Occams Razor says it is me replacing the inlet
manifold
> > 3
> > > > weeks ago, but I've just redone the inlet manifold gasket yesterday
(new
> > > > Felpro gaskets both times with RTV around both sides of the gaskets
> > around
> > > > the water jackets and exhaust as per instructions), and that didn't
> > solve
> > > > the problem.
> > > >
> > > > "Slightly baffled" Dave
> > > >
> > > > "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> > > > news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
> > > > > Dave,
> > > > >
> > > > > Was the engine warm or cold? I'll second the uniformity. So
long
> > as
> > > > they
> > > > > are all close to 8 bar, I wouldn't really worry about it. You can
try
> > > > > putting a few drops of oil in each cylinder and trying the test
again.
> > If
> > > > > the numbers rise your rings are a worn.
> > > > >
> > > > > However, with 8bar and uniformity, I wouldn't worry.
> > > > >
> > > > > Carl
> > > > >
> > > > >
> > > > > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > > > > news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
> > > > > > Thanks Doug & Earle.
> > > > > >
> > > > > > Dave
> > > > > >
> > > > > > "DougW" <post.replies@invalid.address> wrote in message
> > > > > > news:MC8Wg.32151$iA5.14083@dukeread11...
> > > > > >> Dave Milne wrote:
> > > > > >> > Any one got the specs for a compression check on a 360 v8 '91
?
> > > > > >>
> > > > > >> Got me. 160 is "normal" for the I6, but it has a higher
compression
> > > > > >> rating than the V8.
> > > > > >>
> > > > > >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across
all
> > > > > >> > cylinders. I would have expected about 140-160 psi and am a
bit
> > > > > >> > surprised it is so consisently low. That was a dry test -
didn't
> > do a
> > > > > >> > wet one.
> > > > > >>
> > > > > >> Consistency (psi +- 10%) is what your looking for in a
compression
> > > > test.
> > > > > >>
> > > > > >> - Run the engine till it gets warm to the touch.
> > > > > >> - I find it easier on the battery with all the plugs out.
> > > > > >> - Hold the throttle all the way open or the engine won't
breathe.
> > > > > >> - Cranking time varies, but most go with 5-10. I usually do 5.
> > > > > >>
> > > > > >> FWIW, I do a compression test each time I change plugs. Except
> > this
> > > > > >> time, the hose on my compression tester sprang a leak. :(
160-165
> > is
> > > > > >> what the I6 gets when warm.
> > > > > >>
> > > > > >> --
> > > > > >> DougW
> > > > > >>
> > > > > >>
> > > > > >
> > > > > >
> > > > >
> > > > >

 

One thing I don't think anyone mentioned. Did you have the throttle open
when you did the test? If not, the reading will be low.

Chris

"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:bf3f2$45294873$422afc51$312@FUSE.NET...
> That has the AMC 360 right?
>
> http://amccf.com/tech/v8_specs.html
>
>
>
> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
>> Any one got the specs for a compression check on a 360 v8 '91 ?
>>
>> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> cylinders.
>> I would have expected about 140-160 psi and am a bit surprised it is so
>> consisently low. That was a dry test - didn't do a wet one.
>>
>> Dave Milne, Scotland '91 Wagoneer
>>
>>
>
>