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Old 12-22-2021, 09:12 AM   #1
Chaz9496
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Default Noise Coming From Timing Belt Cover, Rear Sprocket

On my 3.0 engine I just had put in a few months ago, I'm getting a knock/rattle from the rear of the camshaft sprocket cover area. It starts about 2 min or so after cold overnight start-up, then quiets down after a few minutes. When I push down on the cover above the sprocket, it stops. It's a "plastic sound" knock/rattle from the cover. I did have the belt replaced as well. This just started last week and doesn't do it the rest of the day, even after sitting for a few hours when it's cold out. I've never heard anything like that before. I'm hoping I can still drive it safely without any damage to the belt. Any ideas ? I was going to have my mechanic check it next week. I didn't know if i should park it until then or not. Thanks for any suggestions.
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Old 12-22-2021, 09:53 AM   #2
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

I would park it until you know what the problem is. Not worth taking the chance.
...
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Old 12-22-2021, 11:33 AM   #3
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

I called my mechanic today and he said the same thing. I wouldn't think its too serious because it doesn't last that long, but you never know. If it did it all the time it'd be easier to diagnose.
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Old 12-22-2021, 07:12 PM   #4
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

Remove timing belt cover and inspect the timing belt components.
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Old 12-22-2021, 10:12 PM   #5
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

I read something today on a Saturn mechanic website that a Saturn owner back in 2018 had the simular noise on his L300. Turned out it was the timing belt tensioner. If that's the case, it could be catastrophic if the belt would come off. The problem is that I have no loaner vehicle. I can't afford to rent anything over the weekend until I can take it in next week. I'm kinda in a hard place with what to do.
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Old 12-22-2021, 11:34 PM   #6
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

It may run for another 5,000 miles or quit in less than 10 miles. When our timing belt tensioner failed, we had just driven 200 miles, I noticed a lack of power going down the highway. It was intermittent. A few days later after not driving it, I took my wife to work and at a stop light, the engine started jumping around and ran like crap with engine light ON. I managed to drive it to a repair shop. They inspected the timing belt and found the belt jumped a tooth on cam1. Their repair cost was too high and I managed to drive it to resting place where I could work on it much later. The belt tensioner was expired. I installed a timing belt kit and it's been running strong ever since.

Risk: Interference Engine i.e. if the timing goes out of time, for whatever reason, you run the risk of damaging valves. I got lucky, but most don't.

If you have to drive the vehicle... plan for it to die. Carry jackets/clothes, water and everything you need to stay warm in case it quits on you. Hell, put a bike on the trunk for alternate transportation.

Chances are, it will run for some time yet. But, don't drag race!
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Old 12-23-2021, 08:38 PM   #7
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

I don't know many 63 year olds that drag race. Lol.
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Old 12-24-2021, 09:48 AM   #8
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

Just as I suspected, it was 40 degrees this morning and, nothing. It's only in 20 degree temperatures it does it. I wondered about that, and my hunch was correct about only being in colder temperatures it's there, because it wasn't when it was warmer out.That makes it even more difficult to understand. I don't know about it being a catastrophic issue due to that, who knows.
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Old 12-28-2021, 03:26 PM   #9
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

Better to diagnose what is and forget about what is not otherwise you consider iterations which mean nothing and convolute the works.
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Old 12-28-2021, 11:50 PM   #10
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Default Re: Noise Coming From Timing Belt Cover, Rear Sprocket

wow what an iteration. sometimes these saturns are more ponderous than a neoclassical motif in an iambic pentameter. watch out though for dealers who are tantamount to pernicious troglodytes. have a good new year sages . bob f
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