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Old 04-28-2013, 11:34 AM   #1
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Timing Chain Question

Whats the difference between the failed timing chains and the replacement chains GM uses? Are they the same chain that will have the same problem or is it a different design?
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Old 04-28-2013, 11:38 AM   #2
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Whats the difference between the failed timing chains and the replacement chains GM uses? Are they the same chain that will have the same problem or is it a different design?
It's a different chain.


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Old 04-28-2013, 06:20 PM   #3
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It's a different chain.


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different part number basically same chain... the issue isn't really the chains themselves... When GM replaced the chains in the Acadia, they were the new part # chains... they only lasted 50,000 miles...
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Old 04-29-2013, 11:06 AM   #4
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Wasn't this issue due in part to the original oil life monitor being set to be changed at 10,000 miles instead of 5,000?
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Old 04-29-2013, 12:04 PM   #5
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Wasn't this issue due in part to the original oil life monitor being set to be changed at 10,000 miles instead of 5,000?
No, not entirely.


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Old 04-29-2013, 05:02 PM   #6
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different part number basically same chain... the issue isn't really the chains themselves... When GM replaced the chains in the Acadia, they were the new part # chains... they only lasted 50,000 miles...
What kind of oil was used in the motor? Conventional or synthetic?
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Old 04-29-2013, 07:43 PM   #7
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What kind of oil was used in the motor? Conventional or synthetic?
conventional.
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Old 05-03-2013, 05:57 PM   #8
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However, if you look on a Cadillac forum at the amount of issues they ha e had with all of the revised chains while using only synthetic oil, to realize that there is a problem.
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Old 05-03-2013, 06:05 PM   #9
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However, if you look on a Cadillac forum at the amount of issues they ha e had with all of the revised chains while using only synthetic oil, to realize that there is a problem.

I know GM knew they had a problem with this engine and put it in the CAMARO ANYWAY. What do you expect from a Cadillac engine.
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Old 05-04-2013, 07:16 AM   #10
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Only use full syn in the 3.6 if you want long life out of the timing chains.
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Old 05-04-2013, 09:38 AM   #11
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This is the biggest worry I have with the LLT. I have used full synth from day 1 changing the oil every 4K but from what I am seeing this won't prevent the chain from eventually failing. I'm at 48K right now and I now find myself waiting for the CEL to come on
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Old 05-11-2013, 10:53 PM   #12
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This is the biggest worry I have with the LLT. I have used full synth from day 1 changing the oil every 4K but from what I am seeing this won't prevent the chain from eventually failing. I'm at 48K right now and I now find myself waiting for the CEL to come on
I changed my out to Mobil 1 after 500 miles or so. My oil was always changed at around 5k. Mine went at 35k miles or so. I really wish people would stop with the
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Only use full syn in the 3.6 if you want long life out of the timing chains.
. When I told the dealer I was going to change over to Mobil1 he said I would be wasting my money. I guess in a way he was right
They claimed it is an upgraded chain. Who really knows......
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Old 05-11-2013, 11:37 PM   #13
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do most people use mobil 1 or royal purple?
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Old 05-12-2013, 07:37 AM   #14
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I use Mobil 1 and I believe a lot of people on the forum use Mobil 1. Does it make a difference? Who knows. I only put around 3500 miles on my V6 a year. I hope to trade it in way before the timing chain issue for a V8.
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Old 05-12-2013, 08:56 AM   #15
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M1 is not nearly as good as it used to be. For of the shelf oil, Castrol syntec is great, pennzoil/QS as well. For a premium Amsoil, valvoline, etc. I stll cant bring myself to trust RP oil.....no problems with gear lube, etc. but we lost to many engines in the days they were title sponsor of some of the IHRA classes.

The biggest issue is using convemtional or a dexos approvend blend. After breakin, get a good full syn in and never use a conventioanl. It is a sure recipe for failure (I know of no one doing more with the LLT & LFX engines than RX). Any one that should know better and still uses conventional is just asking for failure.

And yes, the new chains are improved, but not by alot. It is also critical that you check oil levels regularly as these do NOT have low oil indicators, so you need to monitor it every few fuel fuel ups.



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Old 05-13-2013, 09:31 PM   #16
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M1 is not nearly as good as it used to be. For of the shelf oil, Castrol syntec is great, pennzoil/QS as well. For a premium Amsoil, valvoline, etc. I stll cant bring myself to trust RP oil.....no problems with gear lube, etc. but we lost to many engines in the days they were title sponsor of some of the IHRA classes.

The biggest issue is using convemtional or a dexos approvend blend. After breakin, get a good full syn in and never use a conventioanl. It is a sure recipe for failure (I know of no one doing more with the LLT & LFX engines than RX). Any one that should know better and still uses conventional is just asking for failure.

And yes, the new chains are improved, but not by alot. It is also critical that you check oil levels regularly as these do NOT have low oil indicators, so you need to monitor it every few fuel fuel ups.



Looks like I might be switching to Syntech . . . I've actually heard bad things about the Penzoil, though?
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Old 05-14-2013, 07:04 AM   #17
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Looks like I might be switching to Syntech . . . I've actually heard bad things about the Penzoil, though?
Penzoil platinum is getting better results then M1 on lab tests. M1 is not what it used to be and PP is a very good store bought oil. I am switching to it when I next change my oil.


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Old 05-14-2013, 03:31 PM   #18
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Penzoil platinum is getting better results then M1 on lab tests. M1 is not what it used to be and PP is a very good store bought oil. I am switching to it when I next change my oil.


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Old 05-14-2013, 03:44 PM   #19
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I fail to see how synthetic oil can keep a timing chain from stretching. Any enlightenment on the subject would be appreciated.
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Old 05-14-2013, 10:08 PM   #20
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It didn't help the Cadillac 3.6 either. With that said, it is what goes in my Camaro.
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Old 05-15-2013, 06:01 PM   #21
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I fail to see how synthetic oil can keep a timing chain from stretching. Any enlightenment on the subject would be appreciated.
All so far that reported failures were using synthetic and went by the original oil monitor (9,000 - 10,000) oil change intervals.

I don't think we ever had anyone com on here and say they changed their oil between 3,500 - 4,500 miles and the chains failed.
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Old 05-16-2013, 10:34 PM   #22
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All so far that reported failures were using synthetic and went by the original oil monitor (9,000 - 10,000) oil change intervals.

I don't think we ever had anyone com on here and say they changed their oil between 3,500 - 4,500 miles and the chains failed.
Yeah watch me be the first one . . . I've changed every 3k with Mobil 1 (which I know is probably flushing money down the toilet) but I'm so paranoid about these chains . . . .
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Old 05-17-2013, 06:16 AM   #23
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That still doesn't make sense, from an engineering standpoint. My understanding is that the chains are stretching, not wearing. If that's true, oil or change intervals wouldn't have anything to do with that failure. It would be a weakness in the chain material.

Add to the fact that, if it were the oil that was breaking down prematurely, other components (bearings, can lobes, cylinder walls) would be damaged too. I assume that isn't happening. Until someone can post up a technical reason why this happens, I'm not buying the oil explanation.

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Old 05-17-2013, 11:27 AM   #24
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That still doesn't make sense, from an engineering standpoint. My understanding is that the chains are stretching, not wearing. If that's true, oil or change intervals wouldn't have anything to do with that failure. It would be a weakness in the chain material.

Add to the fact that, if it were the oil that was breaking down prematurely, other components (bearings, can lobes, cylinder walls) would be damaged too. I assume that isn't happening. Until someone can post up a technical reason why this happens, I'm not buying the oil explanation.

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Wait a minute, so you guys are saying 9,000 - 10,000 mile oil changes are OK??
That is what the orig monitor let you go.
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Old 05-17-2013, 12:02 PM   #25
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Wait a minute, so you guys are saying 9,000 - 10,000 mile oil changes are OK??
That is what the orig monitor let you go.
My Porsche called for 15k oil changes...using good old Mobil One.

I've gone to seminars about motor oil, synthetics, etc. A C5 member (Gunny, I think) did testing and proved that there was no significant degradation or contamination in the oil after 8k miles of use.

Synthetic oil will go the distance with no problem. No OEM is going to make that claim unless it's a fact. They are responsible for the warranty, after all.

All bets are off if you're racing it.
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