Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
Intercooler Duct: All Technical Service Bulletins
Engine - Oil Leaks from Charge Air Cooler/Turbocharger
TECHNICAL
Bulletin No.: 09-06-93-001A
Date: February 12, 2010
Subject: Engine Oil Leaks from Charge Air Cooler and Turbocharger Air Inlet Adapter (Replace Clamp and/or Turbo Inlet Duct/Pipe)
Models:
2007-2009 Chevrolet Kodiak
2007-2010 Chevrolet and GMC Light and Medium Duty Trucks Equipped with Diesel Engines
2007-2010 Chevrolet Silverado Equipped with Engine RPO LLY, LBZ or LMM Diesel
2007-2009 GMC TopKick Equipped with Engine RPO LLY, LBZ or LMM Diesel
2007-2010 GMC Sierra
Please Refer to GMVIS
Supercede:
This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 09-06-93-001 (Section 06 - Engine/Propulsion
System).
Condition
Some customers may comment on an engine oil leak from the rear of the engine near the flywheel housing. Upon further investigation, a technician may
find oil in the charge air cooler or turbocharger air inlet adapter.
Cause
Note
Oil found in this system is very rarely an indication of a turbocharger failure.
This condition may be caused by a loose clamp at the inlet duct/pipe located on the turbocharger. Oil may carry over from the PCV system and leak out
the turbo inlet duct/pipe.
Correction
Note
Do not replace the turbocharger if oil is found in the charge air cooler pipes.
Important
When replacing the clamp, tighten the clamp to 5 Nm (41 lb in), then loosen and re-tighten to 5 Nm (41 lb in).
OIL LEAK FOUND AT CHARGE AIR COOLER OUTLET (HOT SIDE)
Clean the rubber duct hose with soapy water and allow to dry. Apply a thin bead of high temperature RTV silicone sealant to the turbocharger
compressor outlet port and CAC duct connections.
Tighten
Tighten the clamps to 8 Nm (70 lb in).
OIL LEAK FOUND (Full-Size Pickup Trucks - Silverado and Sierra)
Replace the turbo inlet duct/pipe and clamp with P/N 98011738.
OIL LEAK FOUND (Vans and Medium Duty Trucks)
Replace the air intake clamp with P/N 97376379. Refer to Air Intake Pipe Replacement in SI.
Parts Information
