OIL LEAKING AT OIL FILTER ADAPTER. Chevrolet Chevy Suburban

SUBJECT: OIL LEAKING AT OIL FILTER ADAPTER (REPLACE WITH A NEW DESIGN ADAPTER)

MODELS: 1988-94 CHEVROLET AND GMC TRUCK K MODELS (FOUR WHEEL DRIVE) WITH 6.2L OR 6.5L DIESEL ENGINES (VINS C, J, F, P, S - RPOS LH6, LL4, L65, L49, L56)

CONDITION:

SOME VEHICLES MAY EXPERIENCE AN OIL LEAK AT THE OIL FILTER ADAPTER. THE LEAK MAY OCCUR AT EITHER THE INTERFACE BETWEEN THE ADAPTER AND ENGINE BLOCK OR AT THE COPPER WASHER, BOLT, AND ADAPTER HOUSING. REPLACEMENT OF THE COPPER WASHER DOES NOT PERMANENTLY REPAIR THE OIL LEAK.

CAUSE:

AN EARLY DESIGN (VIEW A) USES A MULTIPLE PIECE ADAPTER ASSEMBLY WITH AN OIL FILTER (1), CONNECTOR (2), ADAPTER SEAL (3), ADAPTER HOUSING (4), PIPE PLUG (5), ADAPTER O-RING SEALS (6), COPPER WASHER (7), AND BOLT (8). THE COPPER WASHER (7) YIELDS OVER TIME CAUSING LOSS OF BOLT TORQUE THAT RESULTS IN THE OIL LEAKS.

CORRECTION:

A NEW DESIGN (VIEW B) CONSISTING OF AN OIL FILTER (1) AND AN ADAPTER HOUSING ASSEMBLY (4) WAS RELEASED DURING THE 1994 MODEL YEAR. THE NEW DESIGN (VIEW B) IS AN ASSEMBLY INCLUDING THE ATTACHING BOLT AND DOES NOT USE A COPPER WASHER.

1. CHECK FOR EARLY DESIGN OIL FILTER ADAPTER. IDENTIFY THE EARLY DESIGN (VIEW A) BY A PIPE PLUG (5) IN THE ADAPTER HOUSING (4).

2. INSPECT AND CONFIRM THE OIL LEAK IS AT THE OIL FILTER ADAPTER AREA.

3. REMOVE THE EARLY DESIGN OIL FILTER ADAPTER BY REMOVING THE BOLT (8).

4. INSTALL OIL FILTER ADAPTER TO ENGINE BLOCK WITH OIL FILTER TOWARD THE FRONT.

5. TIGHTEN OIL FILTER ADAPTER BOLT TO 63 N.M (47 LB FT).

6. ADD ENGINE OIL AS NEEDED.

7. RUN ENGINE AND CHECK FOR LEAKS.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

DESCRIPTION PART NUMBER QUANTITY OIL FILTER ADAPTER (WITH FILTER) 12553685 1

WARRANTY INFORMATION WARRANTY WILL BE IMPLIED IF THE VEHICLE IS STILL UNDER WARRANTY. IF THE VEHICLE IS NOT IN THE WARRANTY PERIOD, IT WILL BE THE CUSTOMER'S EXPENSE. IF THE VEHICLE IS STILL UNDER WARRANTY USE:

LABOR OPERATION DESCRIPTION LABOR TIME J0970 FILTER, OIL REPLACE, USE PUBLISHED LABOR ADD TIME FOR ADAPTER OPERATION TIME.

FIGURES: 1 ATTACHMENTS: 0

Object Number: 87410 Size: MF

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.