I would look for 135+ with all cylinders within 10 PSI dry. If in
doubt, drop a table spoon of oil in each cylinder and retest. If that
makes a big difference - like more that 15-20 PSI - and still within
10 PSI across the bank then it's well used but reasonable. The
absolute number is a bit tricky - sea level will be considerably
higher than in Colorado over 6,000' up.

On Tue, 2 May 2006 19:03:26 UTC "griffin" <gryffy@DELTHISshaw.ca>
wrote:

> Hey all,
>
> Haven't posted on here in ages since the death of my '86 CJ7's engine. I'm
> looking into an '80 CJ5 today with the 4.2L I6 engine. It's been rolled on
> the highway and has some hood/windshield damage. Haven't looked at it yet
> but the engine is said to run fine and the frame would pass integrity (will
> get this checked before purchase). I'm looking into merging the parts off my
> CJ7 into this to amalgamate a nice vehicle I can build up. First off, will
> the hood/windshield parts and most other parts from a CJ7 onto a CJ5 or vice
> versa? My CJ7 has the small 2.5L 4cyl and is very rusty.
>
> Also, I'm going to take a compression test of the I6 engine - what are some
> good numbers? I know they should all be within 5-10 of each other but just
> need a ballpark of decent #'s to watch for. My 4cyl has 3 cylinders around
> 130 and one in the 80's that's blowing smoke so I know that=bad.
>
> Thanks!
>
>


--
Will Honea

 

I would look for 135+ with all cylinders within 10 PSI dry. If in
doubt, drop a table spoon of oil in each cylinder and retest. If that
makes a big difference - like more that 15-20 PSI - and still within
10 PSI across the bank then it's well used but reasonable. The
absolute number is a bit tricky - sea level will be considerably
higher than in Colorado over 6,000' up.

On Tue, 2 May 2006 19:03:26 UTC "griffin" <gryffy@DELTHISshaw.ca>
wrote:

> Hey all,
>
> Haven't posted on here in ages since the death of my '86 CJ7's engine. I'm
> looking into an '80 CJ5 today with the 4.2L I6 engine. It's been rolled on
> the highway and has some hood/windshield damage. Haven't looked at it yet
> but the engine is said to run fine and the frame would pass integrity (will
> get this checked before purchase). I'm looking into merging the parts off my
> CJ7 into this to amalgamate a nice vehicle I can build up. First off, will
> the hood/windshield parts and most other parts from a CJ7 onto a CJ5 or vice
> versa? My CJ7 has the small 2.5L 4cyl and is very rusty.
>
> Also, I'm going to take a compression test of the I6 engine - what are some
> good numbers? I know they should all be within 5-10 of each other but just
> need a ballpark of decent #'s to watch for. My 4cyl has 3 cylinders around
> 130 and one in the 80's that's blowing smoke so I know that=bad.
>
> Thanks!
>
>


--
Will Honea

 

I would look for 135+ with all cylinders within 10 PSI dry. If in
doubt, drop a table spoon of oil in each cylinder and retest. If that
makes a big difference - like more that 15-20 PSI - and still within
10 PSI across the bank then it's well used but reasonable. The
absolute number is a bit tricky - sea level will be considerably
higher than in Colorado over 6,000' up.

On Tue, 2 May 2006 19:03:26 UTC "griffin" <gryffy@DELTHISshaw.ca>
wrote:

> Hey all,
>
> Haven't posted on here in ages since the death of my '86 CJ7's engine. I'm
> looking into an '80 CJ5 today with the 4.2L I6 engine. It's been rolled on
> the highway and has some hood/windshield damage. Haven't looked at it yet
> but the engine is said to run fine and the frame would pass integrity (will
> get this checked before purchase). I'm looking into merging the parts off my
> CJ7 into this to amalgamate a nice vehicle I can build up. First off, will
> the hood/windshield parts and most other parts from a CJ7 onto a CJ5 or vice
> versa? My CJ7 has the small 2.5L 4cyl and is very rusty.
>
> Also, I'm going to take a compression test of the I6 engine - what are some
> good numbers? I know they should all be within 5-10 of each other but just
> need a ballpark of decent #'s to watch for. My 4cyl has 3 cylinders around
> 130 and one in the 80's that's blowing smoke so I know that=bad.
>
> Thanks!
>
>


--
Will Honea