timing chain noise?? - JeepForum.com
 
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post #1 of 14 Old 05-05-2007, 08:28 PM Thread Starter
cherojeep
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timing chain noise??

Well I had my jeep looked at and was told i have a rod knock first. got a guy i know to give me his opinion and he seems to think its timing chain. he did the old stethescope diagnosis with a screwdriver all over the motor and heard nothing from the oil pain area but heard it right behind the crank pulley where the chain is on the crank.

is it known for timing chains and/or tensioners to go bad?? he also seems to thinnk the heads were already off it at one time.

i dont want to tear it apart if its something major. so i would like some opinions


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post #2 of 14 Old 05-06-2007, 08:53 PM
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Try rotating the crank back and forth while observing the rotor. I believe 10 degrees is acceptable slop. Anything over that and you are looking at a replacement.
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post #3 of 14 Old 05-07-2007, 06:35 PM Thread Starter
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replacement what?? chain/tensioner??? engine?? rotor as is distributor?

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post #4 of 14 Old 05-08-2007, 05:57 AM
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Quote:
Originally Posted by cherojeep
replacement what?? chain/tensioner??? engine?? rotor as is distributor?
Yes..no...yes
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post #5 of 14 Old 05-08-2007, 08:26 AM
75SV1
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The timing chain isn't a major project. Basicllay a bit more involved than a water pump. Beyond a water pump, you will have to take off the front cover. The timing chains do streach.
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post #6 of 14 Old 05-08-2007, 04:34 PM Thread Starter
cherojeep
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hmm guess if i dont sell it i will fix it.

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post #7 of 14 Old 05-09-2007, 03:42 PM
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if it is a rod knock at idle, it will go away or be noticeably less knock when the offending cylinders spark plug wire is pulled off.
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post #8 of 14 Old 05-10-2007, 10:53 PM Thread Starter
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oil pressure is low. idle it reads 0ish and cruising is about 40. what suggests can you give?

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post #9 of 14 Old 05-11-2007, 05:46 AM
75SV1
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First I suggest you have the oil pressure measured by a manual gauge. Make sure the dash gauge is reading correctly. Then if its reading that low, I would think its time for a new oil pump.
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post #10 of 14 Old 05-17-2007, 06:20 PM Thread Starter
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see what happens, my master tech buddy is leaving the dealership i work for and hes the only guy i trust 100%

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post #11 of 14 Old 08-08-2010, 05:08 PM
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bump for solution

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post #12 of 14 Old 03-05-2014, 10:23 PM
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I had the same issue. I was told i have slack in the chain & rod knock.. which seemed strange since i only have 104k miles, oil pressure was good & it only made the knock when revved beyond 3rpm. my timing chain DID have slack and is now replaced. my symptoms were a ticking noise only after engine was warm, and it would come & go as I was driving. I didn't have rod knock. My mechanic says the noise from the chain can travel through the cam shaft creating a noise similar to rod knock. 04 4.7
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post #13 of 14 Old 03-10-2014, 09:31 AM
Jmdperformance
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Your noise is a timing chain tensioner, the tensioner is oil pressure fed to keep the chain tight and when these go bad it allows oil to seep around it causing oil pressure lose and chain noise,, hope this helped
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post #14 of 14 Old 03-11-2014, 08:02 AM Thread Starter
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wow, old thread! I ended up selling this 98 5.9, after I made a claim with ebay after purchase and got full refund and was able to keep/sell it.

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