REAR AXLE SEAL LEAKS. GMC Truck GMC MD P Bus Chassis 1990

SUBJECT: REAR AXLE SEAL LEAKS (INSTALL NEW REAR AXLE SEALS USING PROPER TOOLS)

MODELS: 1990-94 CHEVROLET AND GMC TRUCK C6H, C7H, P6, B7 WITH EATON 15,000 - 23,000 LB. REAR AXLES (RPO'S H10, H16, H11, HZD, HWY, HZW, HZT, HZH, H12, HPW, HPX, H13, HNA, H18, HPY, H19) AND FEDERAL MOGUL AXLE SEALS

CONDITION:

REAR AXLE SEAL LEAKS.

CAUSE:

IMPROPER INSTALLATION. THE CORRECT TOOLS AND SERVICE PROCEDURES MUST BE FOLLOWED WHEN REPLACING AND/OR INSTALLING REAR AXLE SEALS.

CORRECTION:

INSTALL NEW FEDERAL MOGUL AXLE SEALS USING REAR AXLE SEAL INSTALLATION KIT J41107. **KENT-MOORE TOOL J25376-A (OIL SEAL INSTALLATION KIT) IS NO LONGER VALID FOR FIELD INSTALLATION OF AXLE SEALS FOR 15,000 THROUGH 23,000 POUND REAR AXLES.** J41107 IS AN ESSENTIAL TOOL TO BE SENT TO MEDIUM DUTY DEALERS DURING OCTOBER 1994.

IMPORTANT: REAR AXLE SEAL INSTALLATION KIT J41107 IS ONLY VALID FOR INSTALLATION OF THE OLD AND NEW DESIGN FEDERAL MOGUL AXLE SEALS LISTED BELOW. THIS KIT IS NOT VALID FOR INSTALLATION OF STEMCO SEALS (RPO G98).

TOOL AXLE RATING AXLE OLD DESIGN NEW DESIGN NUMBER (LBS) RPO'S P/N P/N

J41107-5 15,000 H10, H16 15611171 15990004

J41107-6 17,850 - 19,000 H11, HWY, 15679981 15703555 HZW, HZD, HZT, HZH

J41107-7 21,000 - 23,000 H12, HPX, 15679880 15982869 HPW, H13, HNA, H18, HPY, H19

SERVICE PROCEDURE:

1. REMOVE BOTH RIGHT AND LEFT AXLE SEALS FOLLOWING "REAR HUB AND BEARING REPLACEMENT" IN SECTION 4B1 OF THE TOPKICK/KODIAK, P6 FORWARD CONTROL AND B7 CHASSIS SERVICE MANUAL. 2. INSTALL NEW REAR AXLE SEALS FOLLOWING "REAR HUB AND BEARING REPLACEMENT" IN SECTION 4B1 OF THE TOPKICK/KODIAK, P6 FORWARD CONTROL AND B7 CHASSIS SERVICE MANUAL. FOR PROPER INSTALLATION, USE REAR AXLE SEAL INSTALLATION KIT J41107 IN PLACE OF J25376-A. REFER TO THE CHART BELOW FOR THE CORRECT TOOL NUMBER TO USE WHEN INSTALLING AXLE SEALS. WHEN INSTALLING THE INNER ADJUSTING NUT, THE LOCK NUT AND THE OUTER ADJUSTING NUT, BE SURE TO PROPERLY ADJUST THE BEARINGS FOLLOWING "BEARING ADJUSTMENT" IN SECTION 4B1 OF THE TOPKICK/KODIAK, P6 FORWARD CONTROL AND B7 CHASSIS SERVICE MANUAL.

IMPORTANT: BEFORE INSTALLING NEW REAR WHEEL SEAL, LIGHTLY LUBRICATE THE SEAL INSIDE AND OUTSIDE DIAMETER WITH REAR AXLE SYNTHETIC LUBRICANT. DO NOT USE BORE SEALANT OR HIT THE SEAL WITH A HAMMER OR OTHER SHARP OBJECT.

SERVICE PARTS INFORMATION:

P/N DESCRIPTION QTY 15990004 REAR WHEEL SEAL FOR EATON 15040S AND 15040T 2 REAR AXLES (RPO'S H10 AND H11) 15703555 REAR WHEEL SEAL FOR EATON 19050S, 19055S, 2 19050T AND 19055T REAR AXLES (RPO'S H11, HWY, HZW, HZD, HZT AND HZH) 15982869 REAR WHEEL SEAL FOR EATON 21065S, 22065S, 2 22070S, 23070S, 23105S, 21065T, 22065T AND 23070T REAR AXLES (RPO'S H12, HPX, HPW, H13, HNA, H18, HPY AND H19)

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME E4270 RIGHT REAR WHEEL BEARING SEAL REPLACE USE PUBLISHED E4271 LEFT REAR WHEEL BEARING SEAL REPLACE LABOR OPERATION TIME

FIGURES: 0

CAPTIONS: 0

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.