Power Rack and Pinion Steering Gear - Fluid Leaks
89cadillac15NO.: 90-I-14
DATE: Oct. 1989
GROUP: 3B
CORP. NO.: 903003
SUBJECT: POWER RACK AND PINION STEERING GEAR FLUID LEAK (DIAGNOSIS AND IMPROVEMENTS)
A number of changes to the end take off steering gear have been made during the 1989 model year to address external leaks. These changes are detailed below:
^ A new high temperature inner rack seal was introduced in January, 1989.
^ Enhanced assembly installation of the outer bulk head seals to reduce seal damage was implemented in March, 1989.
^ Drive screw sealing method changed in May, 1989 to reduce possibility of water entry in seal areas.
^ Redesigned boot clamps for enhanced sealing at gear in November, 1988 to reduce possibility of water entry in seal areas.
^ Improved rack surface finish in seal areas to reduce leak potential.
^ Saginaw Division and its vendors are involved in various ongoing quality enhancement programs.
How To Address Fluid Leaks:
If a customer has commented about having to add fluid and/or external leakage of power steering fluid and there is fluid in the boot(s), then the steering gear should be replaced.
If fluid has not accumulated in the boot, other causes for the leakage must be determined and corrected. Other causes to check for are:
^ Hoses and connections for proper routing, assembly, and torque.
^ Rotary valve seal for leaks.
^ Pump and/or reservoir areas for leaks.
^ Gear housing for porosity.