extremely loud knock - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 13th, 00, 09:45 AM Thread Starter
 
Join Date: May 2000
Location: Knox. Tn. U.S.A
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There's a loud knock coming from (sounds like in the middle of the engine) but I and no one else can tell either. I thought I had a lifter not pumping up so I replaced them and still the noise. The old lifters wasn't wore terribly where they hit the cam so i don't think my cam is shot. maybe one of my valves is burning. Please help this simple noise is driving me crazy.
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post #2 of 7 (permalink) Old Dec 13th, 00, 07:05 PM
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Hey Ozz,

Start your engine and run it for 2 or 3 minutes on a sunny day, then kill the engine and pull the dipstick out and see if there is any glitter, shineys in your oil, if there is pull the engine and fix the bottom end.

You can use a long screw driver to pin point the noise.

Larry
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post #3 of 7 (permalink) Old Dec 13th, 00, 07:29 PM Thread Starter
 
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Somthing tells me it's not the bottom end. it only does it at certain rpm's. or at a certain torque. I've been told it could be the flywheel. but I adjust the valves and tone changes. I've also been told it could be a bent crank. Time for a new motor huh.
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post #4 of 7 (permalink) Old Dec 14th, 00, 03:34 AM
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I once had a loud knock from the engine, only at certain RPM and conditions, swore that the crank was out of it, even had 2nd and 3rd opinions, Yanked the mill out of the Camaro, flipped it over, pulled the pan, started to check individual rod bearings, then when I grabbed the flex plate to roll the engine over I found that the flex plate was loose to the crank, ARRGH !!!! wasted that weekend.

To pin point your knock, pull one plug wire at a time, if the noise is less then you have found what cylinder to look at, another thing you could be running into is the piston slapping the top of the head, would be most noticeable at high RPM with little load.
Lifter or valve train noise would be a light tick noise where the bottom end is a knocking.
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post #5 of 7 (permalink) Old Dec 14th, 00, 07:14 AM
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We just went through this with a Muskrat. In the end, the cam bearings were tear drop shaped!

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post #6 of 7 (permalink) Old Dec 14th, 00, 09:15 AM Thread Starter
 
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thanks for your help guys. I'll check them cam bearings, I'll probably put new bearings in it along with a new cam.
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post #7 of 7 (permalink) Old Dec 14th, 00, 09:54 AM
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David Pozzi
 
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If a rod bearing goes, it could allow a piston to hit the head.
Pull the pan and check the bearings.
David

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