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Question

I have 2001 chevy pickup 2wd 6 cylinder 4.3engine I have A knocking noise on the right side not low on oil this noise gose away after it worm up sounds like lifters the truck has 63000 miles on it . it is not always there when i start it in the morning. then after the truck sits for thee or four hr.its there and can get a little loud

Submitted: 323 days and 8 hours ago.
Category: Chevy
Value: $15
Status: CLOSED
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Optional Information

2001 Chevrolet sylverado 4.3

Already Tried:
I took it to a shop thay said it was a bad oring on the oil pump thay said i was getting air mixing my oil that was not the problem also had a coolent leak at the manifold thay replased the gasket it was a small leak sound like the noise is coming from the lifters

Posted by Clayso 323 days and 8 hours ago.

Answer

Hi there. You are at the beginning stages of intake gasket failure. What is happenning is small amounts of coolant is getting into the lifters. To prove it drain the oil leave the drain plug out and pressure test the cooling system to 15psi for about an hour and you will see coolant drip from the oil pan drain hole.

323 days and 8 hours ago.

Reply

thay replaced the intake manifold gasket at the shop would i still have this problem

Accepted Answer

Hi there. The latter part of your post is now visible to me, as it was not the first time I viewed your post. Yes the coolant that leaked into the oil system has damaged the lifters, I did not know you had already replaced the intake gaskets. I did this same job last week and I was smart enough to replace the lifters when I had the engine apart, I also read about this problem in a forum while diagnosis's the truck I was working on.

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Expert: Clayso
Pos. Feedback: 100.0 %
Accepts: 36
Answered: 12/21/2008

ASE Certified Technician

30 years experience full service, all makes and models. I fix cars.

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