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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 12-28-2011, 12:42 AM   #1 (permalink)
tbensor
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cricket noise on 07 dmax

My truck makes a chirping (cricket) noise under load at exactly 1300 rpm. I believe it is the tensioner. Based on the index marks I am at the bottom end of the tollerance on the tensioner. I am at 55K and 5 years old now and my belt looks good. My questions: 1) Could the noise be something else? 2) Should I replace the belt even though it looks good? 3) Do I need to remve the fan shroud to replace the tensioner? 4) Where is the best (cheapest) place to buy a tensioner?

Thanks,

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Old 12-28-2011, 01:27 AM   #2 (permalink)
jlawles2
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Cheap easy way to determine if the belt is on the way out.

Take one of the extremely cheap hotel bars of unused soap straight out of the package. With the truck running, and being extremely careful, take the dry bar of soap and let it rub on the belt. Do both sides of the belt.

Drive and check. If the chirp goes away, replace the belt as it is glazed and the noise will come back.

If chirp is still present, keep looking.

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Old 12-28-2011, 10:28 AM   #3 (permalink)
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thanks. I'll post the results.
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Old 12-28-2011, 08:45 PM   #4 (permalink)
tbensor
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I replaced the tensioner tonight because it was jumping real bad. Didn't fix it. Going to do the belt and pullies soon. It only took an hour, but what a pain.
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Old 12-30-2011, 09:52 PM   #5 (permalink)
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Many are fighting this issue with no real conclusion as to it's cause or how to fix it. Some have had their power steering bracket changed and fixed the problem, others a pulley or two, etc. Mine is doing it and is killing me slowly. I've changed my belt to a gator back and no dice. I don't care to spend a fortune trying to figure out Chevys issue. Too many trucks doing the same thing to be a coincidence. I asked my stealer about the issue and they say they never heard of such a problem. Service counter guys says his does it and he changed his pullies and still has the chirp but he says it's because he didn't change his belt when he changed the pullies, Whatever!!!

Anyway, Good luck on fixing it, I'll likely go after it someday but I have another car I drive so it barely moves so it's only a pain once in a while.
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Old 02-24-2012, 01:19 PM   #6 (permalink)
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Issue resolved. It was the exhaust bracket on the passenger side of the motor.
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Old 02-24-2012, 01:21 PM   #7 (permalink)
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Cricket noise resolved

I have had a chirping noise at 1300 rpms since November. After battling this noise for several months and replacing the tensioner, idlers and belt my noise turned out to be the exhaust bracket on the passenger side of the motor. Hope this helps you all find your noise.
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Old 02-24-2012, 09:12 PM   #8 (permalink)
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What about it? Was it loose, broken, misaligned, etc? What did you do to remedy the problem?
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Last edited by jacksonw; 02-24-2012 at 09:14 PM.
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Old 02-24-2012, 11:15 PM   #9 (permalink)
tbensor
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Quote:
Originally Posted by jacksonw View Post
What about it? Was it loose, broken, misaligned, etc? What did you do to remedy the problem?
It was loose. It was tightned to fix the problem.
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Last edited by tbensor; 02-24-2012 at 11:18 PM.
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Old 02-25-2012, 08:13 AM   #10 (permalink)
K. Trout
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Good job finding and fixing the problem. I have an "07" also but no chirp yet. Thanks for the heads up.

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