Pontiac: Noisey '92 Bonneville - I'm getting worried

Jknomail wrote: 

The idler pully is the most likely suspect. Pull the belt back off and spin
the idler and check it for wobbling or side-play.

"Jknomail" <com> wrote in message
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Hi Jack check the idler and tensioner pullys could be bad bearings or weak
or broken tensioner spring.

Jim.J

"Jknomail" wrote
 
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this 
away. 

You may have a harmonic balancer that is coming apart.

Ian

>The idler pully is the most likely suspect. Pull the belt back off and spin 

Sorry. I left that off the list of stuff I already replaced. I replaced it, and
the noise didn't change, so it's back in the box to be returned.

JK

>You may have a harmonic balancer that is coming apart. 

Can you explain a little more? I've never heard of a harmonic balancer coming
apart. Would that explain the lack of noise when the belt is off?


Still searching...

Jack

Mine came apart a month ago. It is an expensive piece (~ 420 dollars tax
included plus labor about 80 dollars). You should hear a clunk noise when
you start the engine and it will rattle at idling. Increase idling to about
1200 rpm or more, the noise should be less. You can verify this by using
work light with a mirror to check for rubber crack along the puller and
rubber. Or remove the belts and try to rotate the pulley both direction.
If it turns, it's broken. Check the picture enclosed. If it is the
harmonic (pulley) problem, limit your driving or driving as slow as soon as
possible to prevent engine damage. As for water pump. You should hear a
rolling (grinding noise) not rattle.

http://www3.sympatico.ca/mannig/pulley1.jpg

Cheers,
Paul


"Jknomail" <com> wrote in message
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"Jknomail" <com> wrote in message
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One common problem is the Harmonic Balancer coming apart due to being oil
soaked from the fron crank seal & therefore detoriating the rubber material
of the Balancer causing a vibration.

Another possiblity could be your Belt Tensioner &/or Idler Pulley. I've
seen both of these bearings make a noise when their live's have ended.

--

Sincerely, Alan Ralston
--
GM Patsman

Owner of Pure Performance Fever (On-Line Performance Parts Store)
http://www.bonnevilleattitude.com/store/

Owner of Bonneville Attitude.Com (A Bonneville Informational Archive Forum)
http://www.bonnevilleattitude.com/forum/
--
Home Page: http://www.bonnevilleattitude.com/deathrat/

"Jknomail" wrote
 
coming 

Most harmonic balancers have an inner and outer section that
are held together by a rubber section. When that rubber section
breaks....you can get a lot of noise. It's not real common, but
it was common enough on the 3800 to tell you that you may
want to check that before you replace a bunch of other parts.

Ian