Transaxle - Leak Between Helix Converter Seal and Bore

Bulletin No.: T-93-42
File in Group: 7
Number: 249
Corp.Ref.No.: 277148
Date: Dec. 1992

SUBJECT:
TRANSAXLE FLUID LEAK AT HELIX CONVERTER SEAL

MODELS AFFECTED:
1991-1993 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES WITH HYDRA-MATIC 4T60-E





Some 1991-1993 DeVilles, Fleetwoods, Eldorados, and Sevilles equipped with the Hydra-Matic 4T60-E (RPO M13) transaxle built on or before Julian Date 302 (October 28, 1992) (reler to Figure 1) may exhibit a fluid leak between the helix converter seal and its bore. Under hot weather and/or extreme operating conditions the helix converter seal may walk out partially or completely.

This condition may be caused by the taper and surface finish of the helix converter seal bore.





To repair this condition use the following procedure (illustrated in Figure 2):

1. Remove the helix converter seal taking care not to damage case bore. Refer to the appropriate Service Information Manual, Section 7, "On-Vehicle Service" for removal procedure.

2. Clean case bore with parts cleaner and air dry.

3. Apply a bead of Loctite 272, P/N 12345493 or equivalent, at outer edge of converter seal. This will ensure a uniform coat of Loctite 272, or equivalent, as helix seal is installed.

4. Install helix converter seal, P/N 8680541.

5. Wait 30 minutes before exposing helix seal with Loctite 272 or equivalent, to DEXRON-IIE (ATF). A 24-hour cure time is required before vehicle should be started.

Parts are currently available from GMSPO.





Warranty Information