Time for new bearings? - JeepForum.com

 
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post #1 of 9 Old 11-17-2013, 07:32 PM Thread Starter
nstevic01
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Time for new bearings?

Im getting alot of play in the crank shaft, I'm assuming that the thrust bearing is shot. Thoughts?




99 WJ with a 4.0l and Selec-Trac; 01 WJ with a 4.0l and 2wd
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post #2 of 9 Old 11-17-2013, 07:36 PM
99_wj_QD
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leave it be, I know that may sound like a bad idea but if there are no abnormal noises from that engine I wouldn't think twice about that play you are seeing...simply proves that your crankshaft is getting good lubrication and the bearings are allowing freedom of movement to that crankshaft.

technically speaking too much endplay on a crankshaft is a bad thing, but realistically I would rather have too much endplay than too little.
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post #3 of 9 Old 11-18-2013, 08:13 AM Thread Starter
nstevic01
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There is a couple of sounds coming from the motor at the moment. One sounds like some sort of pulley bearing failure that is intermittent, this lead me to discovering the crank movement. The other is almost like a light knocking noise. I used the stethoscope on pretty much everything and was unable to pinpoint the origins. I just want to do whatever preventative measures that are necessary to avoid killing the motor all together.

I'm debating a full rebuild at the moment since she has 178k on the clock, but aside from the crank movement and the noises listed above, it runs pretty smooth. So If I can get more use out of it by replacing something and not doing a rebuild, that would be preferred.

99 WJ with a 4.0l and Selec-Trac; 01 WJ with a 4.0l and 2wd
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post #4 of 9 Old 11-18-2013, 08:50 AM
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That does seem like excessive play in the crank. You could pull the oil pan and the thrust bearing for a visual inspection. How is your oil pressure?

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post #5 of 9 Old 11-18-2013, 08:51 AM Thread Starter
nstevic01
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Between just below and right at the center of the gauge.

99 WJ with a 4.0l and Selec-Trac; 01 WJ with a 4.0l and 2wd
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post #6 of 9 Old 11-18-2013, 09:04 AM
Jeeples
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Looks to me like it's more of a worn harmonic balancer vs. bad main bearings. IMO, with that much movement of the crank you would have some pretty serious engine noise. If you look closely at your video, you can see the outer ring of the balancer moving independent of the hub that's actually pressed onto the crank snout. I bet with a pry bar or large screwdriver you can probably replicate that movement with the engine off.

I'd replace the balancer and see if the movement continues.

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It is what Jeeples has *PARTIALLY* stated.
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post #7 of 9 Old 11-18-2013, 09:19 AM Thread Starter
nstevic01
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I see what your saying, that's pretty good news, Ill check for play with the pry bar and replace the balancer if necessary. I'll report back with any updates.

99 WJ with a 4.0l and Selec-Trac; 01 WJ with a 4.0l and 2wd
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post #8 of 9 Old 11-18-2013, 09:45 AM Thread Starter
nstevic01
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Other things to do while there? I heard to do the timing cover gasket and related seals, which the kit says I have to do the oil pan gasket at the same time? May also tackle the rear main seal if the pan gasket is required.

99 WJ with a 4.0l and Selec-Trac; 01 WJ with a 4.0l and 2wd
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post #9 of 9 Old 11-18-2013, 09:58 AM
Jeeples
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Yeah, if you're going to replace the timing cover gasket you need to drop the pan. In your video you can see two bolts along the u-shaped part of the oil pan. Those go straight into the bottom of the timing cover.

It might not be a bad idea to do the oil pan gasket and RMS since you're going to be working in the same general area, not to mention they're common leaks so chances are it's time to do them anyway. It'd be a weekend's worth of work, but the parts are pretty cheap.

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It is what Jeeples has *PARTIALLY* stated.
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