A/T- New Transmission Oil Pan, Gasket and Bolts
Bulletin 84-7200-4Date April '84
Ref. No. 84-204-7200
SUBJECT: NEW TRANSMISSION OIL PAN, GASKET AND BOLTS
MODELS AFFECTED: ALL THM 200-4R TRANSMISSIONS
FIGURE 1 - TRANSMISSION OIL PAN:
FIGURE 2 - HEX HEAD SCREW AND CONICAL WASHER ASSEMBLY:
Beginning in January 1984, all THM 200-4R transmissions are being produced using a new transmission oil pan (Figure 1), cork gasket and special hex bolts with conical washers (Figure 2). The new transmission oil pan has a continuous ribbed flange to reduce transmission oil leaks.
When servicing any THM 200-4R transmission for transmission oil pan leaks, refer to the following procedure:
Service Procedure:
1. Diagnose source of leak to be certain leak is from the transmission oil pan area.
2. If a leak is determined to be from this area:
A. Remove the oil pan.
B. Clean the case oil pan face (with solvent) and visually inspect the case oil pan surface for damage and/or presence of R.T.V. sealant (room temperature vulcanizing sealant).
C. Make sure all R.T.V. sealant or other gasket material is removed from the case oil pan face.
3. Replace the past transmission oilpan, with service package number 8639907 which contains the following:
PART NUMBER QUANTITY DESCRIPTION
8639556 1 Transmission Oil Pan
8634198 1 Gasket Trans. Oil Pan
8643693 16 Bolt Asm, With Conical Washer
4. When replacing the oil pan, it is critical that a torque wrench to tighten the hex head screws. DO NOT USE IMPACT WRENCH!
Torque all hex head screws to 11.0 N-m (9.0 ft.lbs.), then retorque the hex head screws a second time to the same specifications as above. The second re-torque is important because the gasket material relaxes after the first tightening.