Exhaust System - Exhaust Leak/Rattle/Rumble/Noise

TECHNICAL

Bulletin No.: 10-06-05-003B

Date: December 12, 2011

Subject: Exhaust Leak, Rattle, Rumble and/or Noise (Install New Clamp and Align Correctly)

Models:
2009-2012 Cadillac Escalade Hybrid
2009-2012 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, Tahoe Hybrid
2009-2012 GMC Sierra 1500, Yukon, Yukon Hybrid, Yukon XL

Equipped with 4.3L, 4.8L, 5.3L or 6.0L Engine

2011-2012 Cadillac Escalade, Escalade ESV, Escalade EXT
2011-2012 Chevrolet Avalanche, Silverado, Suburban
2011-2012 GMC Sierra, Sierra Denali, Yukon Denali, Yukon XL, Yukon Denali XL

All Equipped with 6.2L Engine

Supercede:
This bulletin is being revised to add the 2012 model year and update Parts Information. Please discard Corporate Bulletin Number 10-06-05-003A (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on an exhaust leak or noise. The noise may be described as a rattle or rumble.

Cause

This condition may be caused by an unseated pipe to pipe mid-joint connection as shown below.





Correction





Note
Ensure that the pipe flares remain fully seated to each other while tightening the clamp.

1. Remove and discard the exhaust band (Norma) clamp.

2. Install and position a new exhaust band (Norma) clamp to the pipe joint.

3. Firmly push and maintain the pipes together while tightening the exhaust band (Norma) clamp bolt.

Tighten
Tighten the clamp bolt to 28 Nm (21 lb ft).

Note
After the clamp is installed, it does not need to be perpendicular to the pipe. It is acceptable to have a pipe to pipe or clamp angle.

4. Confirm that the clamp edges (both sides and all the way around the clamp) are fully seated on the pipe.

5. Run the engine and inspect the clamp joint to ensure there are no leaks and that the condition is corrected.

Parts Information





Warranty Information





For vehicles repaired under warranty, use:





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