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Old 05-04-2016, 08:19 PM   #8
Hiker3309
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Join Date: Apr 2016
Location: Woodstock, Georgia
Posts: 4
Re: 1986 K10 Engine Noise - Help Needed! What could it be?

Okay, so here's the update. I took the belts off one by one and started the truck to listen after removing each belt. First the belt to alternator, still noise, so not the alternator. Next the ac compressor, still heard it. Last belt is both water pump and power steering, sounds much better, but still something. I replaced the water pump anyways. I put a link to videos below of it running with no belts and running after I replaced the water pump. Damn it....the stupid noise is still there. I got out my stethoscope again...checked power steering pump, nothing. Then wedged it down behind the water pump and put it on the timing chain cover...could something in there be the culprit? It definitely how the most commotion and noise going on.

Any thoughts? Also, seems the truck has to warm up to start making this ruckis...And not sure if this is relevant, but I also hear a sound around 40-50 that sounds like grinding or metal on metal rubbing. It seems that when I step on the gas and the truck down shifts, it goes away, but as soon as I let off its back. Could be a completely different issue, but figured I mention it.

No belts
https://youtu.be/ooV2jywgCXw
Post new water pump, all belts
https://youtu.be/QJFwrg3QV7M

Thanks again for all the input! I really hope I can get this thing healthy again. This is the first time I've been so stumped with it.
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