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20 years ago
1996 saturn head problem sohc
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20 years ago
Sounds to me like the timing chain wasn't properly indexed.
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20 years ago
Whenever I have done anything to a car which would effect the timing, I always turn the engine over by hand using a breaker bar on the crankshaft nut. This way, if anything is going to bind up and break, I can feel it in my fingers before damaging anything. After spinning 360 degrees I can be confident that nothing is going to snap/crack/dent/ etc.
-David
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20 years ago
David Teichholtz wrote: > Whenever I have done anything to a car which would effect the > timing, I always turn the engine over by hand using a breaker bar > on the crankshaft nut. This way, if anything is going to bind up > and break, I can feel it in my fingers before damaging anything. > After spinning 360 degrees I can be confident that nothing is > going to snap/crack/dent/ etc.
Except in this case the new cam may have had the wrong timing gear on it, meaning that you wouldn't notice a problem for several revolutions.
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- posted
20 years ago
Two rev's
Wes
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20 years ago
I thought about David's comment a while and realized he's right. If the number of teeth on the camshaft sprocket is not exactly twice the number on the crankshaft sprocket, it could take several turns to ruin the engine.
But, if you aren't an absolute idiot, and you put the correct sprockets >
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20 years ago
snipped-for-privacy@lycos.com wrote: > Dan Hicks wrote: >
Two revs for the right gear, to go entirely through a cycle. Would take more for the wrong gear. Say it's 38 teeth vs forty. Each rev of the crank is 1/2 rev of the cam. So each two revs of the crank advances the cam by two teeth. Figure that worst case is when the cam is 90 degrees out, or around 9 1/2 teeth. You'd need 9 1/2 revs of the crank to reach 90 degrees.