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Knocking sound coming from harmonic balancer - 1999 Oldsmobile 88

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  • Oldsmobile Master
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Do you think one of of the rod bearings is spun?

Posted on Oct 13, 2010

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I have a 1996 gmc jimmy and it make a loud knock noise coming from the belt area not sure what it is. I does that noise off and on all the time.


Well, as you know this could be almost anything. I suggest that you check the harmonic balancer. Most internal parts would not stop knocking.....

Feb 16, 2015 | 1996 GMC Jimmy

2 Answers

The out of the pulley with the harmonic balancer keeps coming out causing the belt to come off I've tapped it back on a couple of times it keeps coming back out only now my car has a loud knock what could...


typically harmonic balancers are balanced and indexed to the crankshart they are bolted to. the harmonic balancer should have been replaced when it first came apart. it sounds like the the reinstallation of the defective balancer caused the rotating assembly of the engine to be out of balance. given time this will always damage the main bearings of the engine and I think this is the loud knock you are now hearing. do not continue to use the car and take it to a competent mechanic to evaluate and give you an estimate for the repairs.

Jun 19, 2014 | Cars & Trucks

1 Answer

Loud Knocking noise coming from engine


Most likely the engine harmonic balancer on the front of the crankshaft is coming apart. This is a fairly common issue.

Nov 06, 2013 | 1995 Buick Riviera

1 Answer

99 trooper 3.5 v6 , believe balancer pulley sheared the key.pulley is wobbling and motor knocking like rod knock.is this a zero tolerance engine and are they known for this problem.sounds like motor is out...


IT is a zero tolerance engine which means that if you break a timing belt there will be valve damage. Check the harmonic balancer and if there is a rubber insert between the pulley and the crank shaft hub then replace the harmonic balancer as this rubber has failed and the pulley will fall off. If the key has sheared as you suspect there would be no engine noise as the engine would not be running. Fix the balancer first then check for the noise as it may be just the balancer

Sep 08, 2013 | 1999 Isuzu Trooper

1 Answer

Screechind and knocking sound when it is started


check the harmonic balancer for failure first The sound is probably the pulley slipping on the bonded rubber to the crank hub.

Jun 06, 2013 | Cars & Trucks

1 Answer

Harmonic balancer the ruber is seperating does this meen its bad will it make a noise like a knocking sound


Yes, it's definitely bad. But I'm not sure it would make a knocking sound. That sounds more like your crankshaft, but the harmonic balancer is designed to smooth out crank imbalances.

Oct 09, 2011 | Cars & Trucks

1 Answer

A freind of a freinds' Daewoo has a knocking sound (from the bottom of the engine I think) and a lot of clicking (from the valves or lifters on the top). While she was out of town her daughter used the...


knocking sound in lower half something let go on crank piston rod, bearing,even oil pump pick up upper end noise no oil to valves sucked in a valve ,bent valve,broken rocker etc ,sounds like daughter had engine let go /blow up on her while driving and balancer let go also balancer on crank usually bolted or can be pressed on hard to put one one incorrectly

Sep 29, 2009 | 1999 Daewoo Lanos

3 Answers

Knocking noise coming from belt area. when belt


Had the same issue and it turned out to be the balancer. Not too difficult to fix any questions or advice, I am happy to help you. Justlet me know. Good luck

Jul 11, 2009 | 1992 Buick Century

1 Answer

Knocking sound coming from harmonic balance


the most common cause of this is the balancer rings starting to come apart, replace it and the problem will be fixed.

Jan 30, 2009 | Suzuki Vitara Cars & Trucks

1 Answer

Engine knocking in front


if the sound is a constant clanking and its awfully loud and people turn their heads when you drive by....and its coming from the front, its most likely the harmonic balancer

Jun 24, 2008 | 1991 Oldsmobile 88

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