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Old 06-07-2011, 07:10 AM   #1
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1995 YJ 2.5 Compression Test...

Hi Guys,

Just finished a complete rebuild on a 1995 YJ 2.5l. I did a compression check right after I installed the engine into the truck. No intake/exhaust manifolds were installed during the compression test, The compression test was completed dry. Here are the numbers...

#1 - 150 psi
#2 - 150 psi
#3 - 150 psi
#4 - 135 psi

Before the rebuild, #4 had the problem and there was 0 psi on #4 before the rebuild. A sleeve was installed into that cylinder.

Are these compression #'s within spec.?


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Old 06-07-2011, 08:38 AM   #2

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They'er good

Some would like to see it around 155 psi +,- 10%. the book say +,- 20% accross all cyliners. Did you do the head in the rebuild? That could be your other missing 15psi. All in all, you're not bad.

Ero sum: aut viam inveniam aut faciam = I will either find a way or make one
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Old 06-07-2011, 11:03 PM   #3
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I forgot about this but the engine hasn't been started nor has it been broken in. The #4 cylinder is probably lower than the other 3 because it has a new cylinder wall with cross hatches where as the other 3 were lightly honed. The compression should increase once the engine is broken in once the rings are set.
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