1. Home
  2. Jeep and Willys (new and old)
  3. 1980 CJ5 Compression #'s?

1980 CJ5 Compression #'s?

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!

Reply to
griffin
Loading thread data ...

On Tue, 02 May 2006 19:03:26 GMT in , "griffin" graced the world with this thought:

I think the compression is 150, but not absolutely positive on that.

Reply to
bizbee

Reply to
L.W.(Bill) Hughes III

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 reas> Hey all,
Reply to
Will Honea

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.