Bonneville V6-3800 3.8L (1991)
transaxle may be required.
Cause:
The Side-Cover to channel plate gasket may be split or torn due to a raised surface or ridge on the sealing side of the pan assembly. This raised edge can
apply additional pressure on the gasket and a tear may develop. Vehicle mileage and vibration are factors which can accelerate the potential of the
gasket to tear. The entire inner case side cover gasket is suspect and should be inspected carefully for this condition.
CORRECTION:
Install a new case side-cover pan which does not have the stamping "DO NOT PRY IN THIS AREA." Removing this stamping has improved flatness on
the sealing surface of the side pan and has reduced (but not eliminated) the opportunity of side pan leaking. It should NOT be assumed the removal of the
"DO NOT PRY IN THIS AREA" is a 100 percent fix. Vehicles with side pan leaks, regardless of stamping, should be considered suspect for this
condition. If transaxle already has a new style pan and a leak occurs at the inner side pan gasket, a second side pan (again, without the stamping) may
need to be installed to correct the concern.
NOTE:
Even though the stamping "DO NOT PRY IN THIS AREA" has been removed, it is NOT acceptable practice to pry in the described area when
removing axle and/or seal.
*** IMPORTANT ***
Tightening the inner case side cover gasket nuts may appear to fix the leak. However, fix will be short term and customer will be back.
REMEMBER:
Do not exceed the recommended torque specifications for the pan nuts and bolts. Exceeding these specifications will contribute to further gasket
splitting and render any repair procedures useless.
The torque specifications for the 4T60 and 4T60E are as follows:
4T60
4T60E
Description
(53)
(50)
Case side cover to channel plate
(nut) 8-14 N-m (71.0-124.0 lb.in.)
(52)
(52)
Screw and conical washer assembly
(bolt) 9-13 N-m (80.0-115.0 lb.in.)
SERVICE PARTS INFORMATION:
Part Number
Description
Models
8680513
Pan-Case Side Cover
All
