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post #7051 of 7915 Old 03-21-2013, 10:37 AM
AMP fabrication
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1990 YJ Wrangler 
 
Join Date: Aug 2007
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Hey James, I don't if this will help or not depending on how you did the compression test. If you missed any steps repeat it like this:

Charge the battery if the battery is not fully charged.
Disable the ignition system.
Disable the fuel injection system.
Remove all of the spark plugs.
Block the throttle plate wide open.
Start with the compression gauge at zero, and crank the engine through 6 compression strokes (6 puffs). ( Note: I use four )
Make the compression check for each cylinder. Record the reading.
If a cylinder has low compression, inject approximately 15 ml (one tablespoon) of engine oil into the combustion chamber through the spark plug hole, recheck the compression and record the reading.
The minimum in any one cylinder should not be less than 70% of the highest cylinder. No cylinder should read less than 100 PSI. For example, if the highest pressure in any one cylinder is 150 PSI, the lowest allowable pressure for any other cylinder would be 105 PSI.
Interpreting the readings.
Normal: Compression builds up quickly and evenly to the specified compression for each cylinder.
Piston Rings Leaking: Compression is low on the first stroke. Compression builds up with the following strokes but does not reach normal. Compression improves considerably when you add oil.
Valves Leaking: Compression is low on the first stroke. Compression usually does not build up on the following strokes. Compression does not improve much when you ad oil.
If two adjacent cylinders have lower than normal compression and injecting oil into the cylinders does not increase the compression, the cause may be the head gasket leaking between the cylinders.
Call me if you have any questions.

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post #7052 of 7915 Old 03-21-2013, 10:45 AM
Kenbo-Slice
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Quote:
Originally Posted by Black-Shadow View Post
Where is there a Harbor Freight? they always have good stuff
We have one right in the town of Poughkeepsie off Rt.9.

Harbor Freight is a godsend for certain items. I plan on getting their tubing roller and the SwagOffroad.com weld-on kit for it. For the price it can't be beat!
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post #7053 of 7915 Old 03-21-2013, 10:53 AM
Black-Shadow
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Quote:
Originally Posted by Kenbo-Slice View Post
We have one right in the town of Poughkeepsie off Rt.9.

Harbor Freight is a godsend for certain items. I plan on getting their tubing roller and the SwagOffroad.com weld-on kit for it. For the price it can't be beat!
yea thats the only one that I know of, I didnt think he was going all the way up there but I guess so. I always found cool things there
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post #7054 of 7915 Old 03-21-2013, 11:04 AM
Kenbo-Slice
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Originally Posted by hammerstien View Post
Thanks bone. Appreciate the input and ill definitely check out that site
No problem, if you have any questions let me know. I'm no master welder but I love fabrication and did it prior to becoming a fireman. It's a good trade to pick up!
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post #7055 of 7915 Old 03-21-2013, 11:05 AM
Bear94
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Quote:
Originally Posted by Black-Shadow

yea thats the only one that I know of, I didnt think he was going all the way up there but I guess so. I always found cool things there
There is also one in Middletown near the Toys R Us and Home Depot.

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post #7056 of 7915 Old 03-21-2013, 12:08 PM
YJames90
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I went there and got the tester. Now just have to find TDC on each cly. For some reason I have a problem with that

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #7057 of 7915 Old 03-21-2013, 04:52 PM
Yjdaddy
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So i think the rear in my yj is about to take a dump it feels like its gonna drop out the back of the truck how can i tell if it is the rear or something else is wrong
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post #7058 of 7915 Old 03-21-2013, 04:56 PM
Yjdaddy
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It starts shaking really bad anything over 40 i already ruled out the universals and i checked for slack at the pinion yoke and everything seems to be ok!!
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post #7059 of 7915 Old 03-21-2013, 05:00 PM
Yjdaddy
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I recently put a different ax15 in jeep and it came out of a 94 cherokee it did change the angle of my transfer case but i dont think that has anything to do with whats goin on but i could be wrong
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post #7060 of 7915 Old 03-21-2013, 05:01 PM
Yjdaddy
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Any ideas on where to look next
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post #7061 of 7915 Old 03-21-2013, 05:03 PM
Yjdaddy
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If you let clutch out slow from a dead stop and look under jeep you can see the rear drive shaft shaking something fearce
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post #7062 of 7915 Old 03-21-2013, 05:05 PM
Yjdaddy
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Its got a dana 35 rear is it hard to rebuild if it is bad
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post #7063 of 7915 Old 03-21-2013, 05:05 PM
hammerstien
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Quote:
Originally Posted by Yjdaddy
If you let clutch out slow from a dead stop and look under jeep you can see the rear drive shaft shaking something fearce
Maybe a bad bearing?
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post #7064 of 7915 Old 03-21-2013, 05:09 PM
YJames90
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Did the leak test.
This image has been resized. Click this bar to view the full image.
This is the worst one and its on the side thats leaking oil. all others were at 20 or below. I did the test with the motor cold. I read that its ok and a warmer engine gives better readings ( lower percentage).
I did the test by finding TDC with the mark on the fly wheel. The other 5 others I put air into the tester and moved the flywheel and watched the guage drop and felt the resistance of the compression to find TDC. I felt this was an acceptable method.
The plugs are back in and Im going to try it again tomorrow when the engines warm
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #7065 of 7915 Old 03-21-2013, 05:13 PM
Kenbo-Slice
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Quote:
Originally Posted by Yjdaddy View Post
So i think the rear in my yj is about to take a dump it feels like its gonna drop out the back of the truck how can i tell if it is the rear or something else is wrong
Quote:
Originally Posted by Yjdaddy View Post
It starts shaking really bad anything over 40 i already ruled out the universals and i checked for slack at the pinion yoke and everything seems to be ok!!
Quote:
Originally Posted by Yjdaddy View Post
I recently put a different ax15 in jeep and it came out of a 94 cherokee it did change the angle of my transfer case but i dont think that has anything to do with whats goin on but i could be wrong
Quote:
Originally Posted by Yjdaddy View Post
Any ideas on where to look next
Quote:
Originally Posted by Yjdaddy View Post
If you let clutch out slow from a dead stop and look under jeep you can see the rear drive shaft shaking something fearce

The XJ tranny causes the t-case to be clocked slightly lower. That could have changed your pinion angle enough to cause an issue. Without a CV style driveshaft, the shaft and pinion yoke should be close to being in line. Is your transfer case stock?
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