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Unread 08-26-2014, 09:05 AM   #1
ghetdjc320
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Rubbing Noise from engine

Have what sounds like a rubbing noise coming from somewhere around my valve cover. Its almost unnoticeable until the engine warms up but even then it's not to severe. Doesn't sound very harsh either. I initially suspected something on the belt drive but I can feel the rubbing on the valve cover. Could this be a cracked exhaust manifold? I have a stroked 4.0 but it has an original exhaust manifold. Haven't noticed any loss of power either.

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Unread 08-26-2014, 11:52 AM   #2
bpounds
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Possible timing chain you think? I know you hear it on the valve cover, but that thing is a big bell and you hear just about everything up there, so it might be misleading. The timing chain can rub the cover when the plastic guide wears out or the chain gets loose. Just an idea.
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Unread 08-27-2014, 10:17 PM   #3
ghetdjc320
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The thing is that the noise pulses along with the engine. It's not a constant rubbing noise. Good idea though!
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Unread 08-28-2014, 09:20 AM   #4
Mike Romain
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I would be looking close at the bottom pulley and harmonic balancer for the slightest wobble. It also has a rubber insert that starts coming out when it is failing, but either way can cause a rubbing noise.
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Unread 08-28-2014, 02:14 PM   #5
ghetdjc320
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The harmonic balancer looks good. It's also new with less than 5k on stand it the locked kind that doesn't have the rubber insert. What about a rocker arm rubbing on the valve cover oil baffle?
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Unread 08-29-2014, 07:44 AM   #6
Mike Romain
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Quote:
Originally Posted by ghetdjc320 View Post
The harmonic balancer looks good. It's also new with less than 5k on stand it the locked kind that doesn't have the rubber insert. What about a rocker arm rubbing on the valve cover oil baffle?
Did you use a gasket on the valve cover? Have heard of some folks having issues with some engines by just using RTV. Not often though. If you have a rocker coming loose, it usually ticks before it falls off.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 08-30-2014, 10:34 AM   #7
ghetdjc320
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I used a permadry gasket
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