SHIFT FORK WEAR AND AXLE SHAFT SEAL LEAKS

SOME 1980 AND 1981 OMEGAS EQUIPPED WITH MANUAL TRANSAXLES MAY HAVE A HARD SHIFTING CONDITION DUE TO SHIFT FORK WEAR. THESE CARS MAY ALSO HAVE AXLE SHAFT SEAL LEAKS DUE TO SIDE GEAR/CASE WEAR. AN INSPECTION SHOULD BE MADE FOR BOTH OF THESE CONDITIONS TO DETERMINE WHAT THE EXTENT OF REPAIR SHOULD BE.

A SPECIAL POLICY ON SUBJECT VEHICLES CONCERNING THESE CONDITIONS IS COVERED IN DEALER INFORMATION BULLETIN 81-1-27, DATED APRIL 30, 1982.

THE FOLLOWING SHOULD BE ADHERED TO WHEN MAKING REPAIRE.

SHIFT FORK WEAR

CONDITIONS OF WORN MANUAL TRANSAXLE SHIFT FORKS (BOTH 1-2 AND 3-4) HAVE BEEN FOUND TO BE CAUSED BY THE SHIFT FORK GROOVE SURFACE FINISH IN THE SYNCHRONIZER ASSEMBLY. TO CORRECT A WORN SHIFT FORK CONDITION, REPLACEMENT OF THE 1-2 SYNCHRONIZER ASSEMBLY WITH NEW P/N 14062629 OR 3-4 SYNCHRONIZER ASSEMBLY WITH NEW P/N 14062631, TOGETHER WITH THE 1-2 SHIFT FORK P/N 14008232 AND 3-4 SHIFT FORK P/N 14009112 IS MANDATORY.

WHILE THE OLD SYNCHRONIZER ASSEMBLY MIGHT APPEAR TO BE REUSEABLE, THE SHIFT FORK GROOVE IN THE SYNCHRONIZER ASSEMBLY WILL CONTAIN MICROSCOPIC BURRS FROM RUNNING METAL-TO-METAL WITH THE FORK AND WILL CAUSE THE CONDITION TO RECUR.

THE NEW SYNCHRONIZER ASSEMBLIES INCORPORATE A SMOOTHER SURFACE IN THE SHIFT FORK GROOVE.

TO REPLACE SYNCHRONIZER ASSEMBLIES, FOLLOW THE PROCEDURES IN SECTION 7B OF THE APPROPRIATE OMEGA SERVICE MANAUL.

AXLE SHAFT SEAL LEAKS

CONDITIONS OF DRIVE AXLE SEAL LUBE LEAKAGE CAN BE THE RESULT OF THE SIDE GEAR BEING LOOSE IN THE DIFFERENTIAL CASE. THIS CAN RESULT IN AXLE SHAFT MOVEMENT EXCEEDING THE SEAL LIMIT, THEREBY ALLOWING A LEAK.

IF EXAMINATION OF THE SEAL REVEALS NO DISCREPANCIES SUCH AS EXCESSIVE WEAR, CUTS, SPLITS OR IMPROPER INSTALLATION, AND IF THE AXLE SHAFT CAN BE MOVED BY HAND ENOUGH TO PRODUCE AN OIL LEAK, IT IS LIKELY THAT THE SIDE GEAR HAS WORN THE DIFFERENTIAL CASE. TO REPAIR, THE DIFFERENTIAL CASE MUST BE REPLACED ALONG WITH THE DIFFERENCTIAL SIDE GEARS.

INSTALL NEW DIFFERENTIAL CASE P/N 463058, SIDE GEARS P/N 14040530 WHICH HAVE IMPROVED FINISH, AND, NEW THRUST WASHERS P/N 14040531 WITH FINE GRAIN PHOSPHA COATING TO CORRECT THE CONDITION.

REFER TO SECTION 7B OF THE APPROPRIATE OMEGA SERVICE MANUAL WHEN MAKING THESE REPAIRS.

WARRANTY INFORMATION

OPERATION YEAR OPERATION NO. LABOR TIME TC FAILED P/N

REPLACE SHIFT FORK/ 1980 T0093 4.0 HRS. 92 14062629 SYNCHRONIZER 1981 T0093 4.5 HRS. 92 14062629

REPLACE DIFFERENTIAL CASE,1980 T0094 3.2 HRS. 92 463058 SIDE GEARS AND THRUST 1981 T0094 3. HRS. 92 463058 WASHERS

REPLACE SHIFT FORK/ 1980 T0095 4.4 HRS. 92 463058 SYNCHRONIZERS, 1981 T0095 4.9 HRS. 92 463058 DIFFERENTIAL CASE, SIDE GEARS AND THRUST WASHERS

CLAIMS FOR CUSTOMER REIMBURSEMENT OF PREVIOUSLY PAID REPAIRS ARE TO BE SUB- MITTED AS A SUBLET REPAIR USING LABOR OPERATION T0096, USE TROUBLE CODE 92.

FOR COMPLETE POLICY INFORMATION, REFER TO DEALER INFORMATION BULLETIN 81-1-27

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.