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Unread 06-20-2010, 09:12 AM   #1
Blackfish
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1995 YJ Wrangler 
 
Join Date: Mar 2008
Location: Ash NC
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Timing Chain?

Engine Noise
I have had a increase in a knock in the bottom front of the 2.5l so I have removed the timing chain cover to look for wear, have a few questions before I purchase the kit.

1. The Chain has about 3/4 of an inch of play on the buffer side is this to much?
2. The buffer has 2 groves worn in it that appear to be the drag tracks of the chain they are 1/8 of an inch deep is this normal?
3. could the harmonic damper be clogged with dirt and create a wobble that could have caused this an other damage?
4. Can I put the harmonic damper on without the cover and run for a short period to see if the chain was causing the noise?



Help requested,

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Unread 06-20-2010, 09:28 AM   #2
Brown Dog
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I believe the chain is worn pretty badly, and no further diagnosis is necessary.
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Unread 06-20-2010, 09:45 AM   #3
moonshinefuel
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If it were mine I would change out the timing chain, gears, tensioner, guide, the whole timing chain replacement kit. Also, I would not start it with the timing chain cover off. I don't think dirt clogged in the balancer is causing this no. The grooves and play in the chain are telling you it's a great time right now to replace it. Not advisable to wait any longer. Can't say for sure if it is the cause of the knock, but at least you won't get stranded from a broken timing chain.
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Unread 06-20-2010, 10:29 AM   #4
Blackfish
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1995 YJ Wrangler 
 
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Location: Ash NC
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Thanks for the help as I was cleaning up the harmonic damper I noticed that the shaft on it was worn where it contacts the cover seal also the harmonic damper was full of dirt between the spokes about a 1/2 a cup of dirt, I have ordered the whole kit, any other help would be welcomed.
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