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Unread 11-05-2013, 07:39 PM   #1
lsuguy4
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someone please help me figure this out please

Ok first off im new to this forum. I've had a loud knock after starting my jeep when cold. Btw its a 2000 wrangler 4.0 with 122000 milea. I Recently I replaced my timing chain at a friends house, took about 6 houra to do. But before that it sounded like piston slap maybe. Here is the weird thing. After I put the new chain on and put everyrhing back together I started it and the sounds was gone completely. So after that I started to drive it the next couple days with no knock or slapping what so ever. After the 3 day the noise came back just as loud as it was before. I used mobile 1 before and so im using penns oil. What do yall think would cause it to come back? Timing off a little? Any input with be appreciated! Thanks


Last edited by lsuguy4; 11-05-2013 at 07:49 PM.. Reason: changing the title
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Unread 11-05-2013, 09:03 PM   #2
holysirsalad
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Does your oil filter look like this?



How long does the noise take to go away? If you shut off the engine and restart it, is it gone?

To find roughly where the noise is coming from you can use a small piece of hose like a stethoscope and listen around the engine.
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Unread 11-06-2013, 05:20 AM   #3
lsuguy4
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No my filter is not fram brand. The noise is there right whwn I start it up cold but goes away after warm. If I turn it off it comea for about 30 seconda and then goes away. Why wouod the noise stop after timing chain change? And came back a few days later?
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Unread 11-06-2013, 05:22 AM   #4
cruiser54
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What brand of oil filter DO you have? Fram is not the only junky one out there.
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Unread 11-06-2013, 06:00 AM   #5
BIGBADWOLF
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Post a video so we can hear the noise. If it goes away after 30 seconds it ain't a bearing. My guess would be a lazy lifter. It is also possibly end thrust on the cam shaft. With cold oil the oil pump requires more force to turn it and since the drive gear is helical it forces the cam shaft to move to the front of the engine. Did you notice the timing gear cover when you had it off? Was there any signs of the sprocket hitting the cover? The camshaft has a thrust plate behind the sprocket to prevent the camshaft from "walking" to the front of engine...it could be worn. Also the rear camshaft journal is a blind hole which can allow oil pressure to get trapped and push the cam forward. There is a relief hole in the rear journal to bleed off this pressure which can become clogged.
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Unread 11-08-2013, 02:55 PM   #6
lsuguy4
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My jeep sounds the same.

Could someone tell me why the sound went away at the timing chain replacement? And a few days later the same noise came back
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Unread 11-08-2013, 03:03 PM   #7
lsuguy4
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I also have a wobbly harmonic balancer.... I'm not sure if that could cause the crank shaft itself to wobble a little..
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Unread 11-08-2013, 03:04 PM   #8
cruiser54
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Quote:
Originally Posted by lsuguy4 View Post
I also have a wobbly harmonic balancer.... I'm not sure if that could cause the crank shaft itself to wobble a little..
Won't cause the crank to wobble, but makes some noises on it's own. Why haven't you replaced it?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 11-08-2013, 03:42 PM   #9
lsuguy4
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Quote:
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Won't cause the crank to wobble, but makes some noises on it's own. Why haven't you replaced it?
The motor of the pulley?
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Unread 11-08-2013, 03:47 PM   #10
cruiser54
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The balancer. Didn't you have it off to replace the timing chain?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 11-08-2013, 03:47 PM   #11
lsuguy4
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Can someone tell me why the sound went away at the timing chain replacement? And a few days later the same noise came back. Im stumped. Timming off, harmonic balancer, internal problems?
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Unread 11-08-2013, 03:48 PM   #12
lsuguy4
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Quote:
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The balancer. Didn't you have it off to replace the timing chain?
Yes I did. I replaced everything besides that. Water pump and all gaskets. It was wobbly before the timing chain replacement.
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Unread 11-09-2013, 08:12 PM   #13
cruiser54
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Quote:
Originally Posted by lsuguy4 View Post
Yes I did. I replaced everything besides that. Water pump and all gaskets. It was wobbly before the timing chain replacement.
Shoulda replaced it since the old one was off and stuff.......
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 11-09-2013, 10:16 PM   #14
BIGBADWOLF
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Quote:
Originally Posted by lsuguy4 View Post
Can someone tell me why the sound went away at the timing chain replacement? And a few days later the same noise came back. Im stumped. Timming off, harmonic balancer, internal problems?
Probably because when you were removing/installing it was disturbed into a different position away from the worn bushing.
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