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1992 Pontiac Sunbird Question: Any suggestions on a diagnosis?

 

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Flydutchman, 3.1L V6, Leesburg, VA, January 22, 2013, 15:07
 Rookie

Inside oil replenishment hole on top of the engine the push rod doesn't move while turning the starter. Engine just stopped running after a 2 minute drive. Battery strong, fuel pump running, starter turning but, push rod not moving while starter is cranking.
Thanks for any help.

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  • Answer #1

    Miles Auto Services (884 Answers) , Richmond, VA - (804) 885-4176
    milesauto January 22, 2013, 15:47
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     Master

    If starter is cranking engine and push rod is not moving most likely the timing chain has jumped off sprocket that turns camshaft. If chain has jumped off sprockets the engine cranking speed may sound a bit faster than normal also.

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    Flydutchman, January 22, 2013, 16:06
     Rookie

    So there is still hope that the chain did not necessarily break. If it did, would there be metal parts from the chain or sprockets floating in the block potentially reeking havoc or is there some kind of filter separating this cavity from the guts of the engine?
    Thx for your reply.

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    gmc4me, January 22, 2013, 17:45
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     Journeyman

    If the timing chain jumped off it is very possible that there are no parts in the engine except the complete chain. The timing cover will need to be taken off to determine the necessary action to repair. There is a screen at the bottom of the oil pump which does not allow parts to be sucked into pump and if any shavings get through they should be caught by the oil filter. The holes in the screen are very small. I estimate about 1/16 of an inch.

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    milesauto, January 23, 2013, 00:14
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     Master

    Yes there is hope...but there is work to be done. No chain does not break....teeth wear off cam sporcket or chain tensioner wears out and too much slack in chain.

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