Oil Pan Gasket and Valve Body Cover Gasket - Revised
Number 86-7-5 Date 11/85Subject: NEW TRANSAXLE OIL PAN GASKET AND VALVE BODY COVER GASKET
FOR 1985 AND EARLIER PHOENIX, SUNBIRD, 6000, GRAND AM AND FIERO VEHICLES EQUIPPED WITH 125-C TRANSMISSIONS
Revised by TSB # 8672, Dated 10/85.
Beginning June 6, 1985, or Julian Date 157, all models of the THM 125C transaxle are being produced using new gaskets for the oil pan and valve body cover. The new gaskets have been improved to better withstand specified torque applications and reduce potential transaxle fluid leaks.
Hydra-matic Division requests and authorizes that all dealer inventory of the following packages be returned to WDDGM for credit.
Package No. Description
8631338 Transaxle Oil Pan Gasket
8631340 Transaxle Valve Body Cover Gasket
For THM 125C transaxles built prior to September, 1983 (1984 model year, Julian Date 344), refer to Product Service Bulletin 83-I-149A for proper service procedures. THM 125C transaxles built after September, 1983 used a new oil pan and valve body cover. When servicing these transaxles for oil pan and/or valve body cover leaks, refer to the following procedure:
SERVICE PROCEDURE
1. Diagnose source of fluid leak to be certain leak is from the transaxle oil pan and/or valve body cover (refer to the correct Service Manual section).
2. If leak is determined to be from the transaxle oil pan and/or valve body cover area:
A. Remove the oil pan and/or valve body cover.
B. Clean the case, oil pan and/or valve body cover faces (with solvent) and visually inspect for damage and/or presence of RTV (Room Temperature Vulcanizing) sealant.
C. Make sure all RTV sealant is removed from the case, oil pan and/or valve body cover faces.
3. Replace the past transaxle oil pan and/or valve body cover gasket(s) with:
Package No. Quantity Description
8660038 1 Transaxle Oil Pan Gasket
8660039 1 Transaxle Valve Body Cover Gasket
4. When replacing the oil pan and/or valve body cover, it is critical that a torque wrench is used to tighten the hex head screws. Hand torque all hex head screws 12-16 N-m (9-12 ft. lbs.).