Piston Slap....again.....
Racer
Joined: Apr 2011
Posts: 415
Likes: 1
From: british columbia
heres a video of one of my old cars.
take a guess what the issue was here
http://www.youtube.com/watch?v=oZbQt37HsMQ
take a guess what the issue was here
http://www.youtube.com/watch?v=oZbQt37HsMQ
The Op's post sure sounds like a wiped out cam lobe, it does sound too slow to be a rod, and a rod has kind of a hollow sound to it like rapping the end off a broom handle on a hollow concrete block wall.
(Hows that for a description)
And sorry, it ain't piston slap!
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Well I guess I'll jump on the "It's not piston slap" bandwagon... Pull your Main drive belt off and start the car. If the noise goes away you've narrowed it down to one of the main belt driven components. If it is still there remove your A/C belt as well and start the car. If the noise is still there it's not a belt driven component. If the noise goes away leave the A/C belt off and reinstall the main belt and start the car. If the noise returns it's your harmonic balancer (the only common component of the two belt systems) if it's still gone you've narrowed it down to a component on the A/C belt system.
Another way is to just get a mechanics stethoscope (pretty cheap) and listen. Or you could use a long screwdriver or a portion of a hose, but I prefer a real stethoscope...
Does engine speed have any impact on the noise?
Another way is to just get a mechanics stethoscope (pretty cheap) and listen. Or you could use a long screwdriver or a portion of a hose, but I prefer a real stethoscope...
Does engine speed have any impact on the noise?
Drifting
Joined: Feb 2011
Posts: 1,826
Likes: 1
From: Plymouth Wisconsin
St. Jude Donor '11-'12
This one sounds like a timing chain that stripped a gear, the engine is dieseling.
The Op's post sure sounds like a wiped out cam lobe, it does sound too slow to be a rod, and a rod has kind of a hollow sound to it like rapping the end off a broom handle on a hollow concrete block wall.
(Hows that for a description)
And sorry, it ain't piston slap!
The Op's post sure sounds like a wiped out cam lobe, it does sound too slow to be a rod, and a rod has kind of a hollow sound to it like rapping the end off a broom handle on a hollow concrete block wall.
(Hows that for a description)
And sorry, it ain't piston slap!
it was actually the flywheel bolts hitting the bell housing. they werent even finger tight! I almost spent a lot of money on a rebuild until i found that. 3 minute fix
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,599
Likes: 1
From: Long Island, Nassau County New York
Guys,
The car is in the shop. A very trusted Corvette expert is looking at it. Without tearing anything apart yet, his first though is that it might be just an exhaust leak. His second thought is that its a loose pulley. One thing he said for sure is that its nothing 'major". This mechanic is a very trusted GM guy, so I trust him with diadnosing the issues
The car is in the shop. A very trusted Corvette expert is looking at it. Without tearing anything apart yet, his first though is that it might be just an exhaust leak. His second thought is that its a loose pulley. One thing he said for sure is that its nothing 'major". This mechanic is a very trusted GM guy, so I trust him with diadnosing the issues
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Flywheel bolts should have loctite on them...
Drifting
Joined: Feb 2011
Posts: 1,826
Likes: 1
From: Plymouth Wisconsin
St. Jude Donor '11-'12
Racer
Joined: Apr 2011
Posts: 415
Likes: 1
From: british columbia
My neighbor years ago bought a nova that the previous owner thought had blown a transmission, same problem, ten minutes later he was driving it home after practically stealing it.
