Last post on Aug 25, 2008 at 3:05 PM
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Pontiac Bonneville, Engine, Sedan
#4 of 7 Pontiac Bonneville Engine noise
Aug 25, 2008 (10:55 am)
I have a 1993 Pontiac Bonneville SSEI (supercharger) with a horrible noise at idle. We at first thought it was the bearing in the nose cone of the supercharger, had that fixed. Start it up and it's still there. Then we thought the tensioner unit caused the problem (supercharger) It is out and the noise is still there. It appears it's now in the crankshaft pulley. We need a diagram of that area to see how it is put together and further diagnose the problem. How is the pulley attached? Does it have a shear pin or what?
Please answer as soon as possible.
#5 of 7 Re: Pontiac Bonneville Engine noise [yardhut]
Aug 25, 2008 (11:41 am)
The crankshaft pulley also carries a block of metal that's called the balancer. They are separated by rubber. The rubber may deteriorate letting the inner and outer parts bang against the other as the crankshaft speeds up and slows down with the pulses of energy from the cylinders firing. See if you can wiggle this inner block of the crankshaft wheel.
The crankshaft pulley comes off with a big nut. It requires an air gun that will turn it quickly against the inertia of the whole crankshaft and all or you block the crankshaft in some way to loosen it yourself with a long handle on the socket.
Sounds like the people doing the superchargeer and idle pulley didn't fully verify that those were the source of the noises before they replaced them.
#6 of 7 Re: Pontiac Bonneville Engine noise [imidazol97]
Aug 25, 2008 (2:50 pm)
Thank you for the quick reply. We will check out that area and let you know how it turns out.
#7 of 7 Re: Pontiac Bonneville Engine noise [yardhut]
Aug 25, 2008 (3:05 pm)
I found a link about removing the harmonic balancer and crankshaft pulley.