here's a good one
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here's a good one
I've recently aquired a 65,000 mile 351W. The engine was only driven in a town of about 10000 people. It pretty much never hit 55 MPH, or probably fully warmed up. The engine has more penzoil sludge than oil in Iraq.
But the interesting problem is that it has a killer knock.... or so it seems. When the engine is cold, it runs smoother than a baby's butt. When at operating temp, one hell of a knock. When accelerating it goes away. When decelerating (with tranny) , the knock goes away. When cruising or sitting still, it knocks and almost sounds like a bells' echo.
The crank pullies and balancer wobble about a quarter of an inch, which is also in perfect sync with the knock. The dampner is removed and has the rubber falling off it. Both the front and rear seal are leaking like a drunken dog. I don't know what to think. Can the crank be turned, or is it absolutely trashed. What do all you think it might be???
But the interesting problem is that it has a killer knock.... or so it seems. When the engine is cold, it runs smoother than a baby's butt. When at operating temp, one hell of a knock. When accelerating it goes away. When decelerating (with tranny) , the knock goes away. When cruising or sitting still, it knocks and almost sounds like a bells' echo.
The crank pullies and balancer wobble about a quarter of an inch, which is also in perfect sync with the knock. The dampner is removed and has the rubber falling off it. Both the front and rear seal are leaking like a drunken dog. I don't know what to think. Can the crank be turned, or is it absolutely trashed. What do all you think it might be???
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here's a good one
[updated:LAST EDITED ON 21-Dec-01 AT 10:24 PM (EST)]I had a 302 that the crankshaft actually broke in two, and it still ran! It had a serious wobble too. Before it broke, I had a thumping noise. It actually sounded like somebody was pounding on top of the cab with his fist. But it wouldn't do it unless you had a heavy load on the engine. Going to the dump one day, I noticed pulling a hill, the pounding went away, replaced by what sounded like the muffler was loose. I drove it home and checked it all over, and couldn't find anything till I pulled on the fan belt and saw the damper move up and down. Where I used to work, they had large forklifts with 350 chevys in them. I actually stood there and watched the engine run, and the damper wobble around. It had a broken crankshaft too. Later, it broke again, but that time it came to a sudden halt because the timing chain got hung up when the crank broke.
Oh, to answer your question, there's no way of knowing without pulling the engine and tearing it apart so the crank can be miked by a machinist.
Oh, to answer your question, there's no way of knowing without pulling the engine and tearing it apart so the crank can be miked by a machinist.
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