Engine - Oil Leak At Charge Air Cooler/Air Inlet Adapter

TECHNICAL

Bulletin No.: 09-06-93-001

Date: May 05, 2009

Subject: Engine Oil Leaks from Charge Air Cooler and Turbocharger Air Inlet Adapter (Replace Clamp and/or Turbo Inlet Duct/Pipe)

Models:
2004-2010 Light and Medium Duty Trucks Equipped with Diesel Engines
2010 and Prior Chevrolet Kodiak, Silverado Equipped with Engine RPO - LLY, LBZ or LMM Diesel
2010 and Prior GMC Sierra, TopKick Equipped with Engine RPO - LLY, LBZ or LMM Diesel
Please Refer to GMVIS

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 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

Note
Do not replace the inlet adapter/duct on vans and medium duty trucks - only replace the clamp.

Warranty Information





For vehicles repaired under warranty, use the table above.





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