Debating on Whether to Attempt Changing the Timing Chain Tensioner; - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 12-28-2017, 04:54 PM Thread Starter
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Debating on Whether to Attempt Changing the Timing Chain Tensioner;

Hey folks,

I have an '08 Cobalt with the original style tensioner and 202k miles - more recently I've noticed that it has that rattle on startup. It goes away after a second or so, but it's still unnerving to me.

I ordered a new tensioner, and it should be here shortly, but now I'm second guessing myself on whether to change it.

The more that I read about it the more I worry about causing the timing to go out when changing the tensioner out.

I spoke to the shop I usually deal with when things are out of my capabilities and they tried to convince me away from swapping it out. Citing the fact that if I happened to take it out of correct time I'm going to into a much bigger repair.

Anywho,

Cliff notes;

How much risk is it to change this thing out? I've seen about removing the valve cover in order to ziptie the gears and so on. I'm worried about down on the crank where I can't see.

Thanks in advance for any insight.
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post #2 of 4 (permalink) Old 12-29-2017, 02:16 PM
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Did min last year on a 2006 Pontiac Pursuit...just removed the valve cover, tie wrapped the chain to the sprockets, replaced the tensionner, removed the tie wraps and put the valve cover back on...no problems yet...just take your time and be meticulous, this is a fairly easy job to do...good luck
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post #3 of 4 (permalink) Old 12-29-2017, 04:06 PM
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The only problem that may arise is that the OEM tensioner has fallen apart. But from your statement that it quiets down after a few seconds to me means it hasn't yet. If you have clatter at startup this clearly proves the original tensioner has failed and you need to replace it. It is a fairly simple procedure but if you are not comfortable it's best to let a mechanic do it. When unscrewing the old tensioner it is a good idea to apply pressure on the guide against the tensioner to avoid parts falling inside the cover if the old tensioner has come apart. I did this to my 07 and 08, 07 took 20 minutes to do and 08 took 2 hours because it had fallen apart and in the front cover. Took a bit of time to recover the spring and the tip with a magnet but got her done.

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post #4 of 4 (permalink) Old 01-06-2018, 07:23 AM Thread Starter
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I went ahead and changed this last night, -25 weather. Initially I ruled it a success, but today I went to go drive it and it sounds absolutely awful.

I'm contemplating switching it back at this point - not sure what to think.

---------- Post added at 10:23 AM ---------- Previous post was at 10:01 AM ----------

Anddd.. now it's running beautiful.

AHHHHH!
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