Rainier 2WD L6-4.2L VIN S (2005)
Crankshaft: All Technical Service Bulletins
Engine - Oil Leak from Rear of Crankshaft
Bulletin No.: 05-06-01-022B
Date: June 11, 2007
INFORMATION
Subject:
Diagnostic Information on LL8 Engine Oil Leak from Rear of Crankshaft Due to Porosity (Follow Special Crankshaft Porosity Service Repair
Procedure)
Models:
2005-2007 Buick Rainier
2005-2007 Chevrolet TrailBlazer Models
2005-2007 GMC Envoy Models
2005-2007 Saab 9-7X
with 4.2L Inline 6 Cylinder Engine (VIN S - RPO LL8)
Supercede:
This bulletin is being revised to add the 2006 and 2007 model years. Please discard Corporate Bulletin Number 05-06-01 -022A (Section 06 -
Engine/Propulsion System).
Special Crankshaft Porosity Service Repair Procedure
This bulletin is being published to aid technicians in the diagnosis and repair of oil leak from the rear of the engine. Some engines may have slight
crankshaft casting porosity that results in a leak in the crankshaft flange bore. This leak may be misdiagnosed as a rear main oil seal leak.
Do not assume that an oil leak at the rear of the engine is from a leak at the rear of the crankshaft.
Refer to above illustration for the area of the oil leak (1). Verify the leak by looking in the end of the crankshaft. If oil is present in the bore (where the
torque converter nose engages the crankshaft), the special service procedure needs to be performed. If the bore is dry, or oil appears to be from the seal
area, perform normal oil leak analysis. Refer to Oil Leak Diagnosis in SI.
A service cup plug was recently developed to repair this leak and is available through the Warranty Parts Center (WPC).
Refer to the information in this bulletin to order a service cup plug.
