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Discussion Starter #1
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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What kind of mileage?
 

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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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Discussion Starter #6
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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Get what off???
 

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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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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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you and your pictures Coby7.
 

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Discussion Starter #12
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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Okay I will check that tonight,


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---------- Post added at 11:14 AM ---------- Previous post was at 11:14 AM ----------

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.



I was hearing it on cold starts till I filled it 3/4 full of oil now it doesn't do it...hmmm


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Would you prefer I try explaining in french.....????

---------- Post added at 08:39 PM ---------- Previous post was at 08:38 PM ----------



All the time you hear the chain you're chewing the guides.
I probably will have to change the cam guide I didn't get a chance to take off the valve cover been busy helpin a buddy put his 350 sbc together for his bracket car


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I just noticed some chain noise a few days ago briefly at cold start up. I'm guessing I'll need to replace the tensioner. I have an '05 with 117k miles. Ive seen some threads on here with instructions but the job looks a bit intimidating. I changed out my water pump on my '97 grand am gt back in the day. I remember having issues resetting the timing chain tensioner. I'm just dreading doing this job. Is it difficult? Can anyone guesstimate how long this job takes? I've priced the tensioner. They aren't too expensive. I'm just wondering what else I need to buy? Any new gaskets, guides, seals? I want to make sure I'll have anything is need to get it back together once I've opened it up. Maybe I'll call the shop and get a price on just having it done.


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It took me about 20 minutes. The valve cover gasket is reusable. All you will need is 2 tie-raps to hold the chain in place while you remove the old one, then with the new one in place you just have to push on the guide where it touches the tip of the tensioner to release it from its preset to preload the chain. Remove the ties, reinstall cover and coils, torque bolts and start the car to hear nothing but a purr.
 

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It took me about 20 minutes. The valve cover gasket is reusable. All you will need is 2 tie-raps to hold the chain in place while you remove the old one, then with the new one in place you just have to push on the guide where it touches the tip of the tensioner to release it from its preset to preload the chain. Remove the ties, reinstall cover and coils, torque bolts and start the car to hear nothing but a purr.
I just ordered the tensioner. I'll install it the week after next.


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How do you prevent timing chain failure? Then again I only have 40k baby miles.
 
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