CTS RWD V6-3.6L (2008)
Seals and Gaskets: All Technical Service Bulletins
Drivetrain - Rear Axle Fluid leaks
Bulletin No.: 07-04-20-004
Date: December 19, 2007
TECHNICAL
Subject:
Right Rear Output Axle Shaft Seal Leak (Chamfer Housing)
Models:
2008 Cadillac CTS
Condition
Some customers may comment that the rear axle is leaking fluid.
Confirm the condition following the Rear/Front Axle Lubricant Leak Diagnosis in SI. A technician may find a fluid leak from the right side output axle
shaft seal. The seal may come out of the axle housing when the right hand drive axle flange is removed.
Cause
The axle shaft seal bore in the housing should have a beveled edge or chamfer. This lead-in chamfer helps protect the outer diameter of the seal during
installation. In some vehicles, the chamfer may not have been machined into the housing. In these cases the seal bore will have a sharp, squared-off edge.
Correction
Be careful not to damage or nick the inside axle housing seal bore when removing the seal. A flat bladed tool may be used on the outer edge of the seal
ONLY. DO NOT use a pry bar.
DO NOT replace the complete axle assembly for this condition.
To obtain a proper chamfer for a good seal installation, deburr the right side axle housing seal bore using a standard deburring tool (1), such as
DEBUR300 from Snap-On, EO1000 Edge Off from Noga, SHAVIV by Vargus or the equivalent.
It is necessary to remove the exhaust system and the right rear wheel drive shaft. Refer to Rear Axle Shaft Seal and Rear Wheel Drive Shaft Flange
Replacement in SI to allow room to perform the following service procedure:
Place a clean, lint-free shop towel inside the right side differential seal bore to protect the bearings from any chips created by this process.