buying a cj need advice
is it a good idea to do a compression test when checking out a CJ. i've never done one so how hard is it. does it take long? can someone please explain how to do one and what numbers should i look for with a 83 cj with a 4.2L with a GM TBI. i did a search and only got people talking about the rresults of one
WTF is that?
It's certainly a good idea to test out the engine. $100 seems high to me, but I've never had one done. There are several step by steps on how to do it, and if you have the tester, shouldn't take all that long. Google Engine Compression Test and you will get lots of info. I can't speak for what your compression numbers should be, but I know they should all be realtively close to each other. If you have one significantly lower, then you have problems with that cylinder.
1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.
AMC 20 Write Up
In Progress - 4.56 gears, Aussie Rear Locker, Moser 1 Piece Axles
Coming Soon - CV Shafts, Welded Tubes, trusses
It's not hard. I have a V8 and it only took like 20 minutes or so. Having another person makes it easier, then one person can crank the engine while the other checks the reading (you can count the revolutions that way).
BTW, I just checked my '79 service manual and a new 4.2 6 cyl. should have 140psi (keep in mind this is what a new engine should be). Also, according to the specs there shouldn't be more than a 20 psi difference between cyls. Hope this helps!
I usually just ask them to fire it up, bring a stethoscope and wrap it around your neck. That will make them think. My 258 runs 125 across all 6, it just needs to be close by ten. A $100 to do a test?? I am sure you can do it for much less. Do you need a motor or a Jeep?
85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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