1996 saturn head problem sohc

1996 saturn sohc 1.9 liter put diaonostic computer on the car , getting misfire on cylinder #2 , then did a compreasion test , okey now we got problems . so take the head of the car , and one of the valves are shot (not that big of deal send out to get fix) so they tell me that the cam is beyond repair, okey so get me another cam (used) so the shop puts it in(you would think they would check the lobes to see if they where the same ) and i get the head back . cleaned up nice , put the head on set timing to where it is suppose to be , put it all back to geather , now here is where the problem starts , with the plugs out i roll it over till i see i got oil preasure then i hear crack . (piss me off) so i take the cover off and there is two rocker arms busted off (ahhhhhhhhhh) they where all checked befor hand to make sure where all set right . and as they are self ajusting no problems there , my question is do you people think that maybe that the wrong cam got put in ? person said timeing , but all was set to spec and loke said no plugs where in it . so any help that you may be able to send my way would be very help full . thank you to all that reply :-)
Reply to
trollhunter
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Sounds to me like the timing chain wasn't properly indexed.

Reply to
Dan Hicks

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

Reply to
David Teichholtz

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.

Reply to
Dan Hicks

Two rev's

Wes

Reply to
clutch

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 >

Reply to
Kirk Kohnen

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.

Reply to
Dan Hicks

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