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Pontiac Bonneville Engine Knock

7 messages,  Last post on Aug 25, 2008 at 3:05 PM

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#3 of 7 Engine Knock by dhillger Nov 16, 2007 (7:56 am)
Oil Pressure is fine, maybe a little low but the knock is gone at high rpms.   I went to O'Rielys and bought an oil additive. (the kind thats says it will quiet noisy engines.) Put it in ad let it run for a few minutes. It has made the knock less noticeable at idle but is still there when revved. It now doesn't knock as much when coming down from high rpm, BUT it is still there. I'm not much of a mechanic so do you think replacing a push rod or rocker arm or race pin is hard? It it as easy as taking the valve cover off and doing it there? One of the valve covers is going to be hard to get to if I do.   Here is my conclusion. This engine has been making this sound for at least a few years and has been driven about 10k miles per year. If it was a major problem, i think something would have happened by now. I think its just a slightly loose push rod or rocker. (thinking its a push rod where it touches the cam because the sound comes from deep in the engine) So... if that is all, I think this engine will be fine and will give another 70k to 80k miles no problem. What do you think?
#4 of 7 Pontiac Bonneville Engine noise by yardhut 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. Replies to this message: imidazol97 (Aug 25, 2008 11:41 am) yardhut (Aug 25, 2008 2:50 pm) imidazol97 (Aug 25, 2008 3:05 pm)
#5 of 7 Re: Pontiac Bonneville Engine noise [yardhut] by imidazol97 Aug 25, 2008 (11:41 am)
Replying to: yardhut (Aug 25, 2008 10:55 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. Replies to this message: yardhut (Aug 25, 2008 2:50 pm) imidazol97 (Aug 25, 2008 3:05 pm)
#6 of 7 Re: Pontiac Bonneville Engine noise [imidazol97] by yardhut Aug 25, 2008 (2:50 pm)
Replying to: imidazol97 (Aug 25, 2008 11:41 am) Thank you for the quick reply. We will check out that area and let you know how it turns out. Replies to this message: imidazol97 (Aug 25, 2008 3:05 pm)
#7 of 7 Re: Pontiac Bonneville Engine noise [yardhut] by imidazol97 Aug 25, 2008 (3:05 pm)
Replying to: yardhut (Aug 25, 2008 2:50 pm) I found a link about removing the harmonic balancer and crankshaft pulley. link title   Picture

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