Riviera V6-231 3.8L Turbo VIN 3 4-bbl (1982)
Clutch: All Technical Service Bulletins
A/T - 4th & Overrun Clutch Repair
Bulletin
85-7325-6
Date
Jan., '88
Ref. No.
85-327-7325
Corp. Ref. No. 517101
SUBJECT:
4TH AND OVERRUN CLUTCH REPAIR - THM 325-4L
MODELS AFFECTED: 1982-1985 RIVIERA
Some 1982-1985 Rivieras may experience a condition of a "binding" feel in 4th gear or a total loss of drive. This condition may be caused by 4th and
overrun clutch damage due to transmission lubricating (cooler) oil entering the overrun clutch circuit (causing the clutch to apply in 4th gear) or a loss of
lubricating (cooler) oil to the overdrive assembly. Upon disassembly of the transmission, the 4th and/or overrun clutches will appear burned or blued and
extensive damage to the overdrive assembly may also be evident.
To repair this condition, use the following procedure:
1.
Disassemble the transmission and flush all components.
2.
Flush the transmission cooler and lines to remove all debris and contamination. Inspect the transmission cooler and lines for restrictions and
replace as necessary.
3.
Inspect torque converter for debris and flush. If the failure was extensive, it is suggested to replace the torque converter to prevent contamination
after repair.
NOTICE:
If steps 1-3 are not followed, abnormal shift conditions may result after repair.
FIGURE 1
4.
Replace turbine shaft if any of the following conditions are evident on the shaft (refer to Figure 1):
^
Scoring or bluing.
^
Damaged sealing ring surfaces.
^
Collar not firmly seated against shoulder.
^
Lube passage leakage into overrun passage during air check.
NOTICE:
Check for leakage with 30 P.S.I. shop air in the #1 overrun passage. If leakage is detected from lube passages, replace shaft.
