Century V6-181 3.0L (1983)
Seals and Gaskets: By Symptom
A/T - Front Converter Seal Oil Leak
Model Year
1983
Bulletin No.
83-66
File In Group
70
Number
7
Date
Feb., 83
SUBJECT:
Front Converter Seal Oil Leak On All Model THM 125C Transmissions
Some THM 125C transmissions may experience a front oil leak condition which is due to the front converter seal coming out of its seat in the case bore.
This condition results from an oil pressure back-up behind the converter seal, which causes the converter seal to lose its seat in the case bore.
FIGURE 1
In servicing any THM 125C transmission for this condition, it is recommended that an oil drainback hole be drilled into the converter seal bore of the
transmission case. (See Figure 1)
Proper location is important in drilling the hole. Refer to the following service procedure:
SERVICE PROCEDURE
Always refer to the Service Manual for the proper removal and installation procedures of component parts, 1. With the converter removed and the
transmission in its holding fixture, (Tool J-28664), remove the valve body cover and gasket (or R.T.V. sealant).
2.
Remove the throttle lever and bracket assembly.
3.
Disconnect the wire assembly from the electrical connector.
4.
Remove the control valve assembly, spacer plate and gaskets. (Use care not to lose the check balls which are loose).
5.
Disconnect the manual valve from the rod and retainer assembly.
6.
Remove the transmission case cover.
7.
Remove the drive link assembly. (Drive sprocket, driven sprocket, chain, thrust washers, and bearings).
8.
Remove the converter oil seal.
9.
Remove the drive sprocket support.
