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post #1 of 34 (permalink) Old 10-16-2013, 01:30 PM Thread Starter
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Timing chain sound?

When my cobalt is running it's making a odd sound kinda sound from the left side of the motor. Not quite as loud as when you cold start it the timing chain. It just sounds like the chain is rolling. Checked the oil and it's good. Even added some to see if it'd fix the problem. Any ideas?


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post #2 of 34 (permalink) Old 10-16-2013, 02:18 PM
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What kind of mileage?

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post #3 of 34 (permalink) Old 10-16-2013, 02:30 PM
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Ticking or knocking?

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post #4 of 34 (permalink) Old 10-16-2013, 03:16 PM Thread Starter
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What kind of mileage?
170,766

And it sounds like its Almost loose, I added another half quart to put it 3/4 full it had gotten a lot quieter but still can hear it.


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post #5 of 34 (permalink) Old 10-16-2013, 03:50 PM
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3 possibilities here, your chain is stretched to the point where the tensioner can't keep it tight anymore or hopefully it's just your tensioner that has failed like mine did. Check the head of the tensioner for a bump instead of a flat surface. If it is flat it should be changed anyways. If it doesn't fix the problem then chances are the chain has stretched or it's the waterpump/balance chain tensioner in which case you will need to remove the front cover to change or check.

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post #6 of 34 (permalink) Old 10-16-2013, 05:13 PM Thread Starter
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3 possibilities here, your chain is stretched to the point where the tensioner can't keep it tight anymore or hopefully it's just your tensioner that has failed like mine did. Check the head of the tensioner for a bump instead of a flat surface. If it is flat it should be changed anyways. If it doesn't fix the problem then chances are the chain has stretched or it's the waterpump/balance chain tensioner in which case you will need to remove the front cover to change or check.
what's the easiest way to get it off


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post #7 of 34 (permalink) Old 10-16-2013, 07:59 PM
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Get what off???

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post #8 of 34 (permalink) Old 10-17-2013, 05:20 AM Thread Starter
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Get what off???
Timing cover to check tensioner


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post #9 of 34 (permalink) Old 10-17-2013, 05:37 AM
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You don't need to pull the timing cover for the cam chain tensioner. Pull valve cover to see if there's slack. If there is, the tensioner is on the back of the head. You can take it off with any 1 1/4 wrench or socket, but make sure to ziptie the chain on the sprockets before you do it

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post #10 of 34 (permalink) Old 10-17-2013, 06:32 AM
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There are 2 chain tensioners, if you hear the chain rattle on cold starts chances are it's your timing chain tensioner. You can access it from the back of the block.



First style tensioner was prone to failure. Pictured above is the old style. New one has a bump on head and plunger is held in place with C-clip and cannot fall in.




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