Somerset V6-181 3.0L (1986)
Seals and Gaskets: Technical Service Bulletins
A/T- 3T40 New Side Cover and Bottom Pan Gasket
Bulletin
91-7125-3
Date
Oct. '90
Ref. No.
91-040-7125
Corp. Ref. No. 077132
Figure 1
SUBJECT:
NEW SILICONE BEADED SIDE COVER AND BOTTOM PAN GASKET
MODELS AFFECTED: 1980-91 ALL MODELS WITH 3T40 (THM 125C) TRANSAXLE
BULLETIN COVERS:
A new Side Cover gasket and Bottom Pan gasket for all Hydra-Matic 3T40 (THM 125C) transaxles, which reduces the potential for Side Cover and/or
Bottom Pan leaks. These new gaskets are light gray in color and can be identified by a Silicone Bead which is dark orange in color. (Figure 1)
DATE OF PRODUCTION CHANGE:
These new Gaskets went into production July 16, 1990 (Julian Date 197) for all Hydra-Matic 3T40 (THM 125C) transaxles.
SERVICE PROCEDURE:
These new gaskets can be used on all previous model Hydra-Matic 3T40 (THM 125C) transaxles. Whenever installation or replacement of this new
gasket is necessary, refer to the following procedure.
SIDE COVER GASKET:
1.
Clean ribbed surface of side cover and machined surface of case where gasket is to be installed. Both surfaces MUST be free of transmission fluid.
2.
Place side cover gasket on case with silicone bead facing out.
3.
Carefully install side cover onto gasket and install all pan bolts (7) by hand.
IMPORTANT:
The rib on the pan must fully contact the entire silicone bead; if it does not, leakage may occur.
4.
Torque all pan bolts to 11 N-m (98 lbs.in.).
BOTTOM PAN GASKET:
