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Knock by front exhaust cam during warm up

posted by  eventoday on  Sat Oct 7 12:07 CST 2023
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Hello Hello

I have a 98, v90 with 160k miles and it is the 2.9l engine.

The car is newer to me and I am trying to figure out a couple of issues.

I've noticed when I start the car in the morning, after about 30 seconds I get a pretty loud knock/tock. It goes for about 2-3 minutes with a consistent beat. Maybe 1 knock every 1/2 second. Then it seems when the car reaches a certain temp it goes away. Trying to figure out exactly where it is coming from, I put a small hose to my ear and it is loudest behind the upper timing belt cover where the cam sprocket meets the engine.

Any ideas or thoughts would be greatly appreciated.

Also, I pulled the front of the timing belt cover off to take a look. I didn't see anything unusual but I did notice, the top of the rear tb cover, seems to rub on the belt, in two spots near the corners. It almost looks like it is a guide, integrated into the cover, but I can't imagine rubbing on anything is good?

Kindly





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