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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 04-24-2019, 09:04 PM   #1 (permalink)
markw8
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When to change serpentine belt

I have an 08 LMM. 127,xxx miles. It still has the oem belt. There is no noise or any cracking I can see. We will be going from Ohio to Vancouver Canada with a truck camper and pulling a Jeep.

Is there any consences on the service life of the belt and tensioner? I don't want to change something that isn't necessary.


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Old 04-25-2019, 02:42 AM   #2 (permalink)
davester
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Will the belt and tensioner probably last for your trip and longer? Yes.


Will it totally suck if the tensioner decides to pack it in 100 miles from the nearest town, where it will take at least 24 hours to get the part in? Yes.


I would suggest at least having the parts in your truck (belt/s, idler/s and tensioner/s [I'm not sure if GMT900's have 1 or 2 belts]). It should be pretty straightforward to fix on the side of the road...

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Old 04-25-2019, 09:16 AM   #3 (permalink)
Rvn4me
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I think your manual recommends your serpentine belt change at 150k Or every 10 years, whichever comes first.
I’m a believer of (pm) preventive maintenance since working at GM. Ideally you don’t want to break down and loose productivity.
I replaced my belt, tensioner, idlers at 10 years & 100k.
The way I think is if you do maintenance now it should be good for another 127k. That’s one less thing to worry about on a trip.

Last edited by Rvn4me; 04-25-2019 at 09:31 AM.
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Old 04-25-2019, 04:43 PM   #4 (permalink)
Desert DMAX
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For whatever its worth, at 89K we just had both Thermostats replaced and had the serpentine belt replaced at the same time.


After getting the Thermostats and belt back, I'm glad that we had the belt swapped out because little cracks had developed.


Peace of mind!
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Old 04-25-2019, 05:27 PM   #5 (permalink)
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Out of all the parts spinning with the belt, one of the two idler pulleys will be the first to fail.
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Old 04-26-2019, 12:48 PM   #6 (permalink)
markw8
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Quote:
Originally Posted by heymccall View Post
Out of all the parts spinning with the belt, one of the two idler pulleys will be the first to fail.
Thanks for the reply's

This is the kind of stuff I wanted to hear. I'm going to go ahead and change the belt and pulleys.


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Old 04-26-2019, 01:26 PM   #7 (permalink)
mp06011999
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Quote:
Originally Posted by heymccall View Post
Out of all the parts spinning with the belt, one of the two idler pulleys will be the first to fail.
THIS^^

Can't recall which, but since one was sloppy I did 'em all and the belt since I was already in there. Btw, on my LBZ I found it easy enough to remove the cooler tube on the lower passenger side to have room for the breaker bar to move the tensioner and pulled the belt from the bottom of the truck. It was a few years ago and my memory isn't that great or I'd offer more tips.

Also, there's mention of a particular brand of belt NOT to use. Something about building up harmful static electricity. Again, memory
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Old 04-26-2019, 04:46 PM   #8 (permalink)
markw8
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I read something about a TSB about the brand belt. Does anyone know if it still applies?
Mark
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Old 04-26-2019, 04:48 PM   #9 (permalink)
markw8
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Also I'm seeing two different AC delco numbers, not sure which is correct.
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Old 04-26-2019, 05:26 PM   #10 (permalink)
mp06011999
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Belt: GATES K061195HD
Idler pulley: GATES 36310
Tensioner pulley: GATES 36239

Here's what I got for my LBZ back mid 2017 from Rockauto.

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