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· DuramaxForum Veteran
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INFORMATION

Bulletin No.: 02-06-01-022H

Date: August 18 2008
Subject:
Information on Engine Ticking Noise

Models:
2001-2007 Chevrolet Silverado (Classic)
2003-2009 Chevrolet Kodiak C4500/C5500 Series
2006-2009 Chevrolet Express
2001-2007 GMC Sierra (Classic)
2003-2009 GMC TopKick C4500/C5500 Series
2006-2009 GMC Savana

with 6.6L Duramax(TM) Diesel Engine (VINs D, 1, 2 - RPOs LBZ, LB7, LLY)

Supercede:

This bulletin is being revised to add model years and remove RPO LMM. Please discard Corporate Bulletin Number 02-06-01-022G (Section 06 - Engine/Propulsion System).

Some of the above vehicles may exhibit a random ticking noise that is most audible on an engine with a coolant temperature of 70°C (158°F) or higher and from idle to approximately 1500 RPM. The noise usually is most noticeable at the rear of the drivers side front wheel well. Customers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window. All 6600 Duramax(TM) diesel engines have this condition; however some are more audible than others. Engine build variation from engine to engine contributes to differences in perceived volume. All Duramax(TM) engines are manufactured to very close tolerances to meet the durability and reliability standards.

This noise is caused by the relationship of the engine cylinder block crankshaft journals bearing inserts and the oil film. This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound like random typing on a mechanical typewriter.

This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when in fact it was masked by other noises in the past. Many manufacturers such as Isuzu Hino Mitsubishi and Nissan report a similar condition in their diesel engines. Testing and engine teardowns with this condition reveal no condition that would affect reliability or durability of this engine.

Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicles as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. This noise is a normal operating characteristic of the engine. This noise has no short or long term effects on the engine. Do not attempt repairs for this noise.
Important: Replacing the engine or internal components for this noise will not reduce or eliminate the noise.


Moderators put this wherever you feel it will help, even multiple threads, do what you want with it, maybe make it a sticky as this topic comes up ALOT.
 

· Registered
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413 Posts
Thanks Durally. Yep, mine has that typewriter ticking. Always thought it to be the egr gizmo.
 

· DuramaxForum Veteran
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4,790 Posts
Discussion Starter · #4 ·
nope, but you do have to be able to distinguish between fueel knock and this tick. If it is fuel knock it could be bad injectors, but that is typically on 01-04 LB7s.

On 04.5-05 LLys a lot of people hear the pilot injection switching on and off.
 

· yep yep...
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8,658 Posts
You should hear mine from cold to 170 degrees w my cheap bullydog sounds like a rods gonna fly out of it
 

· Timeless Perfection!
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1,016 Posts
I thought it was the water pump... Good to know. wonder if Amsoil will fix it.
 

· Premium Member
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My LMM is the same. Same sound as the LBZ. Wonder if it has to do with removing emmisions
 

· Premium Member
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Huh??? I dont know what your talking about, it came like that. LOL
New mexico does not have emmisions regulations. YET!!!
 

· Premium Member
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Of Course!!! I talked them into it when Diesel was 5 bucks a gallon. It went from gettin 7 up to 10 in town and 11 up to 14.5 on the highway. It is heavy being a CC with a 9ft utility bed loaded with tools.
 

· Registered
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599 Posts
thats very cool its exactlythe same spot on my truck I dont here it all the time ,good know thank you kind sir
 
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