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2002 Oldsmobile Alero GL1 4dr Sedan

2002 Oldsmobile Alero
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
24 mpg city / 32 mpg hwy
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October 28, 2012, 1:58 pm

Frank C

Question: Please Help Alero Timing Chain

I appreciate any help someone could give me, if you could email me at I can send you some pictures of the work I did to the timing chain.

My wife was driving and the car just quit, after doing alot of research and testing I found it was the timing chain, so I took everything apart - The valve cover and down below to expose the timing chain.

Went and bought a new chain, the tensioners looked good. I took the one cam off (Exaust - the one towards the back of the engine on the ecotec to position the mark EXAUST with the link on the chain. The other one I just turned to bolt with the wrench to line it up. Not sure if I was supposed to turn the cams like that with the wrench, didn't feel any resistance.

Then I went down below and lined up the red dot on the camshaft gear with the mark on the chain. Everything looked good to me. The INT and EXST marks on top were right on and below was right from the instructions.

I put everything back together, the chain was not easy to get in, the instructions didn't say anything about the allen wrench cap in the head that exposes the from tensioner in order to get that out, but I did it and got the chain in.

Then after putting everything together I tried to start it and it did the same exact thing as before, the starter spins , i believe the chain broke again.

I've read about intereference engines, what should I do now? if I take the valve cover off again how can I test to see if the lifters are damaged from looking and did I do something wrong by taking the cam off to align it? is there something I should be looking at to reset the cams if you don't know where the cams were and the timing is totally wacked?

Why would it break a brand new chain right off the bat? your help is appreciated.


November 2, 2012, 11:13 pm

Richard W
Expert Mechanic

You timmed the egine wrong. Have seen it before. Sounds like you are doing it right. There could be something wrong with the engine. Try to spin it over by han. If you can not then you will have to replace the engine.

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