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I have an 08 z06 that started making a strange noise in the engine bay. It has 97,000 miles all stock. I changed the oil about a week ago. And the sound started on Sunday May 17th. I haven’t driven it since it started making the noise.
Lets hope it is something on the accessory drive but that sounds pretty serious. Take the belt off and start it for a moment when it is cold and see if it goes away.
Don't guess.....get yourself a mechanic's stethoscope like this one from Harbor Freight or even a short length of garden hose to pinpoint where the noise is coming from....then go from there.
That doesn't look like a LS7. The valve cover has an oil cap.
LS7s had a dummy cap on the right cover.
Originally Posted by Nacho421
I have an 08 z06 that started making a strange noise in the engine bay. It has 97,000 miles all stock. I changed the oil about a week ago. And the sound started on Sunday May 17th. I haven’t driven it since it started making the noise. https://youtu.be/ueILakOE1oY
I fear the worst.
That sounds like a bad lifter roller cutting a notch into one of your cam lobes.
It's at cam RPM, which rules out the balancer. By all means, poke around with a stethoscope, run the car with the belts off, etc., but I don't think it's going to be an accessory or a bad rocker.
It's at cam RPM, which rules out the balancer. By all means, poke around with a stethoscope, run the car with the belts off, etc., but I don't think it's going to be an accessory or a bad rocker.
Hard to tell. Make sure you place your hand on the right hardline going into the AC condenser. When one of the ribs rips off the accessory belt, it usually slaps against this hardline down by the crank pully and you can feel it with your hand.
It's at cam RPM, which rules out the balancer. By all means, poke around with a stethoscope, run the car with the belts off, etc., but I don't think it's going to be an accessory or a bad rocker.
Oh, man. Mine sounded almost exactly like that. It turned out to be a lifter failure where the roller seized and ate the lobe off the camshaft. Metal shavings everywhere. I ended up doing a complete tear down and rebuild with all forged components. Look under my thread-starting history for “Let’s play, ‘What’s that noise?’”
Oh, man. Mine sounded almost exactly like that. It turned out to be a lifter failure where the roller seized and ate the lobe off the camshaft. Metal shavings everywhere. I ended up doing a complete tear down and rebuild with all forged components. Look under my thread-starting history for “Let’s play, ‘What’s that noise?’”
The aftermath (note the one on the left how much material got eaten):
What's left of the lifter's roller after it seized and ate the cam.
It sounds suspiciously similar to a bad lifter however if that’s the case I wouldn’t tear down for a complete rebuild in my car (God forbid)
I would change the cam get a good set of lifters with force axel oiling (they cost around $600.) clean up the oil pan install a brand new high pressure high volume oil pump inspect the timing chain change only if necessary and put it all back together with a solid bushing trunnion upgrade on the rockers.
Get a 2.5 inch magnet and put it in the bottom of the oil pan actuality I have two of them they are great passive ally’s.
UNLESS the lifter turned and mess up the block that’s a completely different scenario hopefully is not the case here.
It sounds suspiciously similar to a bad lifter however if that’s the case I wouldn’t tear down for a complete rebuild in my car (God forbid)
I would change the cam get a good set of lifters with force axel oiling (they cost around $600.) clean up the oil pan install a brand new high pressure high volume oil pump inspect the timing chain change only if necessary and put it all back together with a solid bushing trunnion upgrade on the rockers.
Get a 2.5 inch magnet and put it in the bottom of the oil pan actuality I have two of them they are great passive ally’s.
UNLESS the lifter turned and mess up the block that’s a completely different scenario hopefully is not the case here.
If you read the attached thread, you'd see that the metal shaving from the failed lifter scored the cam bearings, so machining the block would have been required regardless. I just took the extra step to forge the engine it while it was out of the car.
Help. C6z making strange noise
did not notice that myself
