A/T - Oil Pan Fluid Leaks

Bulletin No. T 87-65
File in Group 7
Number 153
Corp. Ref. No. 677121
Date Jan. '87
SUBJECT: NEW DESIGN TRANSMISSION OIL PAN GASKET

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

FIGURE 1 - TRANSMISSION OIL PAN:

FIGURE 2 - HEX HEAD SCREW AND CONICAL WASHER ASSEMBLY:

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

FIGURE 3 - OIL SCREENS:

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 ft.lb.) and all 200-4R screws to N-m (8 ft.lb.).