Timing chain - Chevy Impala SS Forum
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post #1 of 25 (permalink) Old 01-05-2016, 05:13 PM Thread Starter
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Timing chain

How can u tell if the timing chain going bad


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post #2 of 25 (permalink) Old 01-06-2016, 07:42 PM
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Sometimes you can not tell. The timing can be off, or jump around. You need a timing light to check it, and then it may not tell you what you need to know, because the computer controls timing, and can vary it at any time.

How many miles are on the car?

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post #3 of 25 (permalink) Old 01-07-2016, 09:56 AM
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It will break... which never happens.

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post #4 of 25 (permalink) Old 01-13-2016, 04:39 PM
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I saw my mechanic one time to take the belt in two places and try to force to move from one side to other. he explaines me that the only moment in which you can move it is when the chain is loose and need to be replaced.

He turn car off, dismount the upper side of the radiator fan cover and took belt with both hands, left between air compressor and exhaust compressor and right between alt and hidraulic pump... then tried to make it move in both directions. the belt moved a bit and stopped and the same for the other side. He dissasembled and replace the chain and tooth wheels.
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post #5 of 25 (permalink) Old 01-13-2016, 05:51 PM
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The only way you can check for a worn timing set is to remove the timing cover, and see if the chain is slack. Once you have it open, you might as well replace it anyway. The timing set is cheap, and relatively easy to replace after removing all the stuff to get the timing cover off. Do not replace just the chain, or just the cam gear and chain. You have to replace all of it, or it will wear out quickly.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
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post #6 of 25 (permalink) Old 01-13-2016, 08:32 PM
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Your mechanic knows how to make money from you.
The car will still run fine with a loose timing chain.
Timing CHAINS are good for at least 400k miles.

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post #7 of 25 (permalink) Old 01-15-2016, 12:23 PM
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I think even a brand new OEM chain for a LT1 will have some slack in it.
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post #8 of 25 (permalink) Old 01-15-2016, 12:26 PM
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Quote:
Originally Posted by Goldmaster View Post
I think even a brand new OEM chain for a LT1 will have some slack in it.
I am not a mechanic but I am sure no lack must be allowed in this parts due it will affect the sincronization between vlaves and piston positions. It must be as firm as possible

Last edited by JOSEFO; 01-15-2016 at 12:43 PM.
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post #9 of 25 (permalink) Old 01-15-2016, 02:02 PM
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Quote:
Originally Posted by JOSEFO View Post
I am not a mechanic but I am sure no lack must be allowed in this parts due it will affect the sincronization between vlaves and piston positions. It must be as firm as possible
If what you were saying is "No "Slack" must be allowed" then this is not true. I only say this due to what I saw on my factory chain, there was a good amount of Slack in it.

Back when I had the Front Cover off the engine I decided to replace the Stock chain with one from Cloyes. The car ran fine before the swap, I just decided to replace the Chain and Sprockets anyway. As Nab had mentioned, its highly unlikely that these go bad unless the chain Breaks (unlikely) or the teeth on sprockets wear. So your mechanic may not have been truthful or just didn't know any better....either one of those is not good in a mechanic.

There was definitely more slack in the Stock Chain as the Cloyes setup had less slack in it when new. Keep in mind that if I was to pull the cover today and recheck it, it's highly possible that the Cloyes chain could have opened up a bit after running and have a little more Slack then when new.

EDIT - There is Slack. Here are some pics to prove it at the bottom of this thread.

https://www.impalassforum.com/vBullet...s+timing+chain

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post #10 of 25 (permalink) Old 01-15-2016, 06:04 PM
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Quote:
Originally Posted by 4DoorSS View Post
If what you were saying is "No "Slack" must be allowed" then this is not true. I only say this due to what I saw on my factory chain, there was a good amount of Slack in it.

Back when I had the Front Cover off the engine I decided to replace the Stock chain with one from Cloyes. The car ran fine before the swap, I just decided to replace the Chain and Sprockets anyway. As Nab had mentioned, its highly unlikely that these go bad unless the chain Breaks (unlikely) or the teeth on sprockets wear. So your mechanic may not have been truthful or just didn't know any better....either one of those is not good in a mechanic.

There was definitely more slack in the Stock Chain as the Cloyes setup had less slack in it when new. Keep in mind that if I was to pull the cover today and recheck it, it's highly possible that the Cloyes chain could have opened up a bit after running and have a little more Slack then when new.

EDIT - There is Slack. Here are some pics to prove it at the bottom of this thread.

https://www.impalassforum.com/vBullet...s+timing+chain

Dear friends... as I said, I am not a mechanic but work with precise machines (CT's) and perhaps the problem is my bad manegement of the english languajes. of course CAN be some slack and it doesn't mean you need to change chain. There is a tolerance range, but when I replace it. The total assesembly must look like the bycicle chain... not tigh but not holding just with the movement inherent to the chain parts itself.
I donīt say that a car doesnīt work with a slack chain, I say it can fail and jump a tooth in one of the pulleys with a elonged one. To adjust and keep the 0° calibrations before reconnect the calibration plug is easy but after connect it the ECM will over work to maintain it without detonate.

From another stand point, I want to be clear with something. I want to learn, and, if I make a mistake or say a wrong thing . I will no problem to apologize about.

Best regards
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