INFORMATION ON SERVICE PROCEDURE FOR REPAIR. Cadillac Eldorado 1994

SUBJECT: INFORMATION ON SERVICE PROCEDURE FOR REPAIR OF ENGINE OIL LEAK AT THE REAR MAIN SEAL AND/OR "T" JOINT FACE

MODELS: 1993 CADILLAC ALLANTE 1993-95 CADILLAC ELDORADO, SEVILLE 1994-95 CADILLAC CONCOURS 1995 OLDSMOBILE AURORA WITH 4.6L NORTHSTAR V8 ENGINE OR 4.0L V8 ENGINE (VINS 9, Y, C - RPOS L37, LD8, L47)

THIS BULLETIN PROVIDES INFORMATION FOR REPAIRING AN ENGINE OIL LEAK THAT IS PRESENT AT THE REAR MAIN SEAL AREA OF THE ENGINE. A LEAK IN THIS AREA MAY BE CAUSED BY A DAMAGED OR MISPOSITIONED REAR MAIN SEAL AND/OR A LEAK AT THE "T" JOINT OF THE UPPER TO LOWER CRANKCASE. THE "T" JOINT IS THE SURFACE AT WHICH THE REAR MAIN SEAL AND UPPER/LOWER CRANKCASE SPLIT LINE MEET.

REAR MAIN SEAL/UPPER CRANKCASE TO LOWER CRANKCASE JOINT LEAK

IF INSPECTION OF THE REAR MAIN SEAL AND CRANKCASE REVEALS THAT THE LEAK IS PRESENT AT THE "T" JOINT FACE OR SPLIT LINE AT THE UPPER/ LOWER CRANKCASE, PERFORM THE FOLLOWING PROCEDURE.

1. REMOVE THE TRANSMISSION ASSEMBLY AS DESCRIBED IN SECTION 7A OF THE APPROPRIATE SERVICE MANUAL. 2. REMOVE THE FLYWHEEL AND REINFORCEMENT. 3. CHECK THE REAR MAIN SEAL TO SEE IF IT IS MISPOSITIONED. IF IT IS, REMOVE THE REAR MAIN SEAL BY DRILLING A 1/8" HOLE IN THE METAL BODY AND REMOVING WITH A SLIDE HAMMER. 4. THOROUGHLY CLEAN THE UPPER/LOWER CRANKCASE SEAM WITH DISC BRAKE CLEANER AND DRY THE SURFACE.

NOTICE: THE DISC BRAKE CLEANING SOLVENT MUST BE OF THE AEROSOL TYPE AND MUST NOT LEAVE ANY RESIDUE WHICH WOULD AFFECT THE SILICONE RUBBER SEALANT AND ITS ABILITY TO CURE.

5. PLACE A BEAD OF GM RTV SILICONE RUBBER SEALANT, P/N 12345739, ON THE SPLIT LINE SURFACE. 6. LUBRICATE THE REAR MAIN SEAL SEALING LIPS WITH ENGINE OIL AND SLIDE THE SEAL OVER THE ARBOR OF SEAL INSTALLER J38817. THE GARTER SPRING MUST FACE IN TOWARD THE CRANKCASE. A PROPERLY INSTALLED SEAL SHOULD BE SEATED 0.3 MM BELOW THE SURFACE OF THE BLOCK FACE AROUND THE ENTIRE SEAL (FIGURE 1). 7. THREAD SEAL INSTALLER J38817 INTO CRANKCASE FLANGE AND INSTALL SEAL BY TURNING HANDLE UNTIL TOOL BOTTOMS AGAINST CRANKCASE. 8. INSTALL FLYWHEEL AND REINFORCEMENT. 9. INSTALL THE TRANSMISSION ASSEMBLY AS DESCRIBED IN SECTION 7A OF THE APPROPRIATE SERVICE MANUAL.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: J1120 LABOR TIME: 5.6 HRS.

FIGURES: 1 ATTACHMENTS: 0

Object Number: 82781 Size: FS

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.