Engine - New Design Intake Manifold Gaskets
88cadillac14Bulletin No. T-89-42
File in Group 6A
Number 101
Corp. Ref. No. 816110
Date Dec. 1988
SUBJECT: REVISED INTAKE MANIFOLD GASKETS
MODELS AFFECTED: 1985-1988 DE VILLES AND FLEETWOODS 1982-1985 RWD DE VILLES AND BROUGHAMS 1982-1988 ELDORADOS AND SEVILLES 1987-1988 ALLANTES
Continuous development at Cadillac has resulted in an improved intake manifold gasket sealing system available now from GMSPO superseding the originally released gaskets. The sealing system is an engineered combination of components working together, and depending upon each other, to provide a durable, effective seal. The key components of the system are:
^ New intake manifold side gaskets made of a graphite (rather than asbestos) based material.
^ New manifold end seals with a grid of "suction cups" to aid sealability.
^ New intake manifold attaching bolts with captured Belleville spring washers.
^ Previously released solid cylinder head dowel pins, refer to Bulletin T-86-41.
Resealing Gasket Kits
These components have been assembled into a series of kits called "Intake Manifold Resealing Gasket Kits" with applications for all 1982-1988 4.1L and 4.5L V-8 engines.
P/N Application
3634741 1982-1983 C, E, K
3634742 1984 C, 1985 D, E, K
3634743 1985 C (FWD)
3634744 1986-1987 C, E, K
3634745 1987-1988 V
3634746 1988 C, E, K
These resealing units are intended for use when other engine service is being performed which requires cylinder head removal (i.e., it is necessary to install cylinder head dowels). Cylinder head removal to repair an intake gasket leak may make this kit uneconomical.
Each resealing kit contains detailed installation instructions including information on selection and position of spring/washer bolts and a revised bolt torquing procedure and new lower torque values required.
IMPORTANT: It is important to follow these instructions carefully to realize the maximum benefit from this new sealing system. It is likewise important that all resealing kit components be installed together.
Gasket Only Kits
For the most economical repair as well as to provide for subsequent service of engines already converted with resealing kits, a series of "gasket only" kits are also available.
These gasket kits are intended to directly replace the previously released gaskets described in Bulletin T-88-21. The kits contain only the new side gaskets and end seals and may be used with the conventional design intake manifold bolts. Specific installation instructions are again included and must be thoroughly followed.
P/N Application Replaces
3634753 1982-1985 C, E, K, D 3634619
1986-1987 C, E, K
3634754 1987-1988 V 3634660
3634755 1988 C, E, K 3634723
Upgrading to the new sealing system provided by the resealing kits is preferred and recommended whenever repair economics permit. 1989 production engines as well as past model service engines produced after 1989 start of production have incorporated the revised gaskets and bolts included in resealing kits.