Engine - Revised Oil Pan Gasket Available

91cadillac04

NO.: 91-1-53

DATE: May, 1991
GROUP: 6
CORP. NO.: 116104


SUBJECT:
REVISED OIL PAN GASKET (4.1L AND 4.5L ENGINES)


This bulletin cancels and replaces DSIB 91-I-10 which should be discarded. This bulletin is being revised to include 1982-1984 model years and to clarify the quantity of fasteners required to accommodate the revised oil pan gasket.

A revised oil pan gasket has been released to improve oil pan sealability. This new gasket contains circular spacers on each side of the oil pan bolt holes which limit the compressibility of the gasket to maintain gasket integrity, even if the bolts are over tightened. The revised gasket is available from GMSPO by ordering P/N 3522550. The previously released oil pan gasket has been cancelled.

To allow this improved gasket to be used on 1982-1985 Brougham, 1987-1989 Allante, and 1982-1990 DeVille, Fleetwood, Eldorado, and Seville engines (before 1990 VIN breakpoint C-354000, E-619000, K-826000) the oil pan attaching bolts must also be updated. The revised bolts have a wide washer head to allow bolt torque to press directly upon the gasket's circular spacers and also incorporate a locking system to maintain proper bolt torque.

Revised bolts are available from GMSPO by ordering P/N 3525195 (20 required) for all cars except 1987-1991 Allantes which require P/N 3525196 (20 required) due to the increased flange thickness of the cast aluminum oil pan. Once updated with these revised bolts, future service can be accomplished with only the revised gasket.

Parts are currently available from GMSPO.