Oil Filter Adapter - Oil Leakage
File in Section: 6 - EngineBulletin No.: 57-61-33
Date: November, 1995
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 0-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 GMSP0.
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
Filter, oil replace, Use published
J0970 add time for labor operation
adapter time.