For 1990-2009 cars

# REVISED INTAKE MANIFOLD GASKETS

#### SUBJECT: INTAKE MANIFOLD GASKETS RESEALING KIT USAGE (INSTALL RESEALING KIT)

#### VEHICLES AFFECTED: 1982-88 C, D, E, K, V 4.1L AND 4.5L V8 VIN 5, 7, 8

This bulletin supersedes and replaces bulletin 88-641-112 (corporate bulletin #816110) which should be discarded. It is being revised to include the cylinder head dowel pin part number.

At the start of the 1989 model year Cadillac released a revised intake manifold gasket sealing system. Cadillac recommends conversion to this revised sealing system whenever possible if repairs being performed on 1988 or prior model engines requires intake manifold removal.

However, before a complete resealing kit can be installed it is essential that the engine be equipped with solid tubular cylinder head to block dowel pins. (Solid dowel pins were included in both Production and service engines during model year 1985 beginning with engine unit number T10L499404). Because of the dowel pin requirement, service kits for past model year engines are released in two formats:

o A preferred service complete resealing kit which includes all parts needed to convert past model engines that are equipped with solid cylinder head dowel pins.

o An alternate service gasket only kit for servicing engines not equipped with solid cylinder head dowel pins (when service being performed does not require cylinder head removal).

The engine unit number printed on a sticker affixed to a rocker arm cover, and inspection of the engine's existing intake manifold attaching bolt configuration and the engine's warranty history will help determine the appropriate service method. Using this infor- mation refer to the following service chart. Refer to the Parts Information section of this bulletin for specific par numbers and applications.

#### PARTS INFORMATION:

#### IMPORTANT: All gasket kits include specific installation instructions which must be followed thoroughly.

#### Complete Resealing Kit:

These kits include the intake manifold side gaskets, and seals, and Belleville washer type attaching bolts.

P/N APPLICATION --- ----------- 3634741 1982-1983 C, E, K 3634742 1984-1985 D, E, K, 3634743 1985 C (FWD) 3634744 1986-1987 C, E, K 3634745 1987-1988 V 3634746 1988 C, E, K

Gasket Only Kit:

These kits include only the intake manifold side gaskets and end seals.

P/N Application --- ----------- 3634753 1982-1985 C, E, K, D 1986-1987 C, E, K

3634754 1987-1988 V

3634755 1988 C, E, K

Cylinder Head Dowel Pin:

Package includes one stepped tubular dowel pin.

P/N APPLICATION --- ----------- 1634935 All engines prior to 1985 model year unit number T10L499404

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.