OIL PAN GSK.FLUID LEAKS NEW CELLULOSE OIL PAN GSK.

MODELS AFFECTED: 1979-1986 THM 200/200C/200-4R TRANSMISSIONS

Some Cadillacs equipped with a 200-200C or 200-4R transmission may experience oil leaks from the oil pan and/or pan gasket. This condition has been previously addressed in Serviceman Bulletins numbered T-84-37 and T-84-69.

A new latex-coated cellulose (hard fiber material) oil pan gasket has been released for service. Improved sealing is provided by better withstanding fastener torques. This new gasket can be used on the models listed above that are equipped with an oil pan of the continuous raised rib design (refer to Figure 1) and hex head screw with conical washer (refer to Figure 2).

Service Procedure

When servicing these transmissions for oil pan leaks or repairs involving removal of the oil pan, the following chart should be used to update the unit if not equipped with an oil pan of the continuous rib design. The kit may contain a latex-coated cork gasket (soft material) which should be replaced with the new latex-coated cellulose gasket (hard fiber material).

Service* Transmission Reference Latex-Coated Update Kit Type Bulletin Cellulose Gasket ---------- ------------ --------- ---------------- 8638929 200/200C T-84-37 8648529 8639907 200-4R T-84-69 8657387

IMPORTANT On 1979 models, the previous type oil screen must be replaced with a new oil screen to avoid interference with the new oil pan (refer to Figure 3).

Note:* The service update kit contains a pan, hex head screws with washers and a latex coated cork gasket. The latex coated cellulose gasket must be ordered separately.

When reinstalling the oil pan, it is critical that a torque wrench be used to tighten the hex pan screws. Hand torque all 200/200C screws to 13 N.m(10 lb. ft.) and all 200-4R screws to N.m (8 lb. ft.).

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.