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post #1 of 7 Old 12-28-2012, 08:32 AM Thread Starter
2001SLVSTNTJ
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compression numbers...what next

Guys-

2001 TJ Auto, 4.0 been running rough with flashing CEL. Did a compression check and all cylinders 170-185 except #3 was 115 dry and 150 wet. Concerned about the cylinder at this point. This is a Jasper reman with @ 14K on it (with TUPY head) but out of warranty. What would be your next step.

Thanks!

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post #2 of 7 Old 12-28-2012, 12:24 PM
mdm
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Out of warranty at 14k? The wet compression number indicates a piston ring problem.

I guess my next step would be to replace the #3 rings. I don't normally recommend working just one cylinder but with just 14k on the rebuild it might be a logical option. While in there I'd be checking the other cylinders also.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #3 of 7 Old 12-28-2012, 01:38 PM Thread Starter
2001SLVSTNTJ
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Yeah, motor replaced in 2008. I bought a year ago and put @ 5K on it ...not a daily driver. Yes, seemed ring/cylinder to me with the wet bumped number. I am not a motor head by any means...might the rings open up if soaked the cylinder with oil (read it might on another thread). Can rings be replaced with motor in jeep?
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post #4 of 7 Old 12-28-2012, 02:36 PM
mdm
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Quote:
Originally Posted by 2001SLVSTNTJ View Post
...Can rings be replaced with motor in jeep?
Yes.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #5 of 7 Old 12-28-2012, 04:04 PM Thread Starter
2001SLVSTNTJ
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ok, thanks....sounds like pull the head and see what i find and go from there.
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post #6 of 7 Old 12-29-2012, 08:22 AM Thread Starter
2001SLVSTNTJ
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May try the block tester that changes the fuild color just to get more info before tearing down.
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post #7 of 7 Old 12-30-2012, 10:23 AM Thread Starter
2001SLVSTNTJ
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Tried the block tester and the fluid didn't change color. So this is telling me there is not likely a head gaskets leak right? If there was a leak between the cylinder and one of the water jackets the color should have turned and A leak between cylinders would have low compression in both cylinders...sound right? No pro here try to get as much as I can before opening up. I need to borrow a compressor to run the leak down test, maybe later today for that.

Last edited by 2001SLVSTNTJ; 12-30-2012 at 11:56 AM.
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