Question about 1995 Chevrolet Lumina

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3.1 tming chain

I am changing the timing chain, and when I turn crank gets to a certain spot it comes to a dead stop. I have tried turning the cam a little at a time' but the crank still wont move. At first I thought that a valve was sticking, but I have to back the crank off to turn the cam all of the way around.

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  • jfksunny Aug 06, 2008

    have a 3.1 won't start, pops out of carb when cranking? >cleaned plugs,(barely running when I got ) frank

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There are alignment marks on the timing set,and before you remove the old timing set,you must get cylinder number 1 in the firing order to Top Dead Center....then you can remove the old,and reinstall the new,timing set,but pay careful attention to the marks on each gear,in relationship to each other and where they line up.The new timing gear and chain set should have directions on where they are to line up,if not,you need to buy a Chilton manual for your specific car,as i don't have the specific information for your 3.1 engine.It sounds like your timing is WAY off,and when rotating the crank,a piston is hitting a valve...that means it's WAY out of phase...do not start the engine until resolved.The camshaft actuates the valves in relation to the crank and pistons' position,and when the valves open or close is VERY important for the engine to run properly,this is what i'm talking about (phased in) correctly.

Posted on Jul 27, 2008

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