Timing Chain Tennsioner Question - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 29 (permalink) Old 02-02-2014, 07:49 AM Thread Starter
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Timing Chain Tennsioner Question

My 07 Cobalt is about to hit the 100,000 mile mark on it's 2.2L motor. I've read a lot about the timing chain needing to be replaced about now. My question, can I change out the tennsioner and not change out the chain? Or is it best to go ahead and change both out with this many miles? I understand there is an updated tennsioner that should replace the existing one. Apologies if this has been asked already. I couldn't find anything to answer this question..
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post #2 of 29 (permalink) Old 02-02-2014, 08:19 AM
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I'm not 100% sure on this answer either.. You could pull off the valve cover and inspect the chain, see if its stretched
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post #3 of 29 (permalink) Old 02-02-2014, 09:50 AM
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Yes, you can change the tensioner without changing the chain.

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post #4 of 29 (permalink) Old 02-02-2014, 09:58 AM
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I think I misread the question
Coby to change the tensioner you still have to pull of the valve cover to release the tensioner right?

Not sure if there were any tricks to get around that. I don't know of any.
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post #5 of 29 (permalink) Old 02-02-2014, 10:04 AM
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Yes, that is the safest way, eventhough some people have done it without it. The tensioner releases the minute the chain rattles around on the guide, but I don't think I would chance it on a 100K miles car. Removing and re-installing the valve cover is easy enough. That's the way I did mine, it took all of 20 minutes.

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post #6 of 29 (permalink) Old 02-02-2014, 04:39 PM Thread Starter
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I'm not getting any noise yet, so I'm hoping I can save this for some warmer weather... Just doing my homework before I get into it.
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post #7 of 29 (permalink) Old 02-03-2014, 03:08 AM
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This is just me, but if you're going through the work of changing timing chain tensioners, why not take time to also complete required maint. (chain/belt & water pump)? Maybe I'm drinking the koolaid, but 100K service in my mind is one of the important motor milestones and timing chain/belt failure is catastrophic results so I say peace of mind's worth a little extra time. Am I wrong...??

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post #8 of 29 (permalink) Old 02-03-2014, 04:54 AM
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You can change the tensioner in 30 mins, the t-chain/balance shaft chain /wp will take you 5+ hrs and cost a bit more..
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post #9 of 29 (permalink) Old 02-05-2014, 12:44 PM
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Maybe I haven't talked to the right people, but I've never heard of a timing chain failing. Belts are another matter, but I've known people with GM vehicles with 200,000 to 500,000 miles who've never touched the chain and it's still working just fine when the vehicle goes to the junk yard.
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post #10 of 29 (permalink) Old 02-05-2014, 01:17 PM
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Timing chains won't break but they can stretch to the point where the tensionner can,T keep it tight and it will jump timing. Yes, some last a long time if you do regular oil changes and keep it topped up. But I read some horror stories on here. Just do a little search about timing chain and you will see quite a few. I've been on this forum for about 2 years and at least a dozen have reported timing chain failures.

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