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Old 01-24-2011, 09:19 PM
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Timing chain noise

i have a 2001 pontiac grandam with the 2.4 L engine. about a month ago, the timing chain, sprockets, and water pump were replaced. after that, the engine was making a ticking type noise, took it to a shop and was probably over charged for them to replace the tensioner, now i have what sounds like the chain slapping around. i pulled the cover off again and the chain appears tight except the guides seem to have a slight clearance between them and the chain. but nothing that seems really bad.

Would the old guides cause the chain slapping noise?

Will replacing the guides solve this noise?

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Old 01-25-2011, 07:44 AM
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The chain guides should have been replaced when the chain and tensioner were replaced. A competant shop would know this. Yes, the chain guides will wear thru the slide material and create slack that the tensioner can't adjust out to.
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Old 01-25-2011, 10:39 AM
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Was the tensioner shoe replaced too? They are available separately, it might not have been replaced when the tensioner was.
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Old 01-25-2011, 01:34 PM
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Does it still do it with the cover off ?


Cole
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Old 01-25-2011, 02:01 PM
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the shoe for the tensioner appears new and looks like it was replaced. the other three guides are yellow in color and all have a slight concave affect were the chain sits on them. i havent tried starting the engine with the cover off. that will make a mess. I will tonight turn the motor by hand and see.

What do you guys think. thanks so far.
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Old 01-25-2011, 02:15 PM
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Quote:
Originally Posted by novadan
the shoe for the tensioner appears new and looks like it was replaced. the other three guides are yellow in color and all have a slight concave affect were the chain sits on them. i havent tried starting the engine with the cover off. that will make a mess. I will tonight turn the motor by hand and see.

What do you guys think. thanks so far.
Yeah guess it would make a mess what was i thinking.
It just would be nice to know if it still made the sound with it off, did you notice any marks on the inside of the cover anywhere ?
I would say the others are right about it being the guides though.

Cole
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Old 01-25-2011, 02:18 PM
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I would start it with the cover off. There will be some mess involved, but it will not damage anything as long as everything's out of the way, etc. You can use some old towels to catch what flies off the chain and gears, maybe towels or newspaper on the ground under the front of the engine.

That way you can see exactly what's happening.

Good idea to look for any 'witness' marks where it might have been contacting the cover or whatever.
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Old 01-25-2011, 02:29 PM
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I didnt really look at the cover, i will inspect it more when i get home. ill probably start it and let it run for a minute and see what happens. the noise will appear within a few seconds of running.
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Old 01-25-2011, 02:31 PM
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Quote:
Originally Posted by novadan
I didnt really look at the cover, i will inspect it more when i get home. ill probably start it and let it run for a minute and see what happens. the noise will appear within a few seconds of running.
That's what i would do and the mess won't be that bad IMHO


Cole
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Old 01-25-2011, 02:50 PM
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ill let you know what happens after i start the engine
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Old 01-25-2011, 08:43 PM
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so i found out that when the chain and sprockets were replaced, all the guides were also replaced.

I ran the engine with the front cover off, it still sounds like guides are worn out. but i did notice that the tensioner shoe could move about an 1/16 of an inch away from the piston of the tensioner.

Is there a way to adjust the tensioner to eliminate the slack in the chain?
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Old 01-26-2011, 04:20 AM
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Quote:
Originally Posted by novadan

Is there a way to adjust the tensioner to eliminate the slack in the chain?
IIRC there is no adjustment on that, The spring inside the tensioner is more then likely worn and you would have to replace it if it has to much slack in it. That's the only thing that i know that can fix it anyway. And that is more then likely where your noise is coming from.JMO


Cole
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Old 01-26-2011, 04:34 AM
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Was the tensioner 'reset' after it was installed? It has to be installed retracted, IIRC. Then the piston is pushed back into the body of the hydraulic 'caliper' to allow it to release so it can extend outward.
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Old 01-26-2011, 04:37 AM
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Quote:
Originally Posted by cobalt327
Was the tensioner 'reset' after it was installed? It has to be installed retracted, IIRC. Then the piston is pushed back into the body of the hydraulic 'caliper' to allow it to release so it can extend outward.
X2 you remember correctly Mark , That's how it's supposed to be done.


Cole
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Old 01-26-2011, 06:54 AM
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the tensioner was replaced, but the guy that installed it, told me he kinda pryed into place. he said he had to bolt one side in then pry it into place to get the other bolt lined up. im gonna pull the tensioner off tonight and see if it can be reset.

would you guys recomended replacing te tensioner or just try reseting it first.
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