A/T - Transmission Fluid Leak At Case Gasket
89AMCjeep05Models
1989 B2 Body
Subject
KM170 Series Automatic Transmission Fluid Leak At Case Gasket
Index
TRANSMISSION
Date
July 10, 1989
No.
21-58-89
(C21-03-9)
P-2678
BODY CODE LEGEND
B2 - SUMMIT 4-DOOR
SYMPTOM/CONDITION
To correct case gasket fluid leaks, the gasket material for the automatic transmission case gasket has been changed from a joint sheet gasket to a rubber coated metal gasket. The new gasket is included in kit part no. MD730803.
The transmissions with this change are the KM171 and KM176. They were all built after March 12, 1988 (T/A No. EL2316 and up).
As a result of the case gasket change, the differential and transfer shaft end play (preload) adjusting method has been revised.
Figure 1:
PARTS REQUIRED
1 Transmission Case Gasket Kit P/N MD730803
(See Figure 1 for kit components)
SERVICE PROCEDURE
Gasket Replacement only
When only the transmission case gasket is being replaced and a joint sheet type gasket is being replaced with a rubber-coated metal gasket, use the following procedure to set the preload.
1. Remove the converter housing and remove the spacers from the differential and then remove the spacers from the transfer shaft (only if the "both end support" type transfer shaft used).
2. Measure the thickness of the spacer that was removed and then select a spacer from the parts kit that is 0.10 mm thicker. Install the thicker spacer in the housing.
3. Clean the gasket mounting surface of the transmission case and apply a thin coat of petroleum jelly.
4. Install the rubber-coated metal gasket and then install the converter housing and tighten the bolts to 19-23 N-m (14-16 ft.lbs.) torque.
Figure 2:
Internal Component Replacement
When internal transmission components, (i.e., converter housing, differential, etc.) are replaced the procedure for establishing end play (preload) for the differential and transfer shafts is as follows.
1. Remove the converter housing and remove the spacers from the differential and then remove the spacers from the transfer shaft (only if the "both end support" type transfer shaft is used).
2. Place 10 mm (.40 in.)-long, 3 mm (.12 in.)-dia. pieces of solder at the two locations in the differential assembly as shown in Figure 2.
Figure 3:
3. Place two 10 mm (.40 in.)-long, 3 mm (.12 in.)-dia. pieces of solder at the locations in the converter housing as shown in Figure 3. Install the converter housing without the case gaskets and tighten the bolts to 19-23 N-m (14-16 ft.lbs) torque.
4. Remove the converter housing bolts and remove the housing and take out the solder.
Figure 4:
5. Measure the thickness of the flattened solder with a micrometer as shown in Figure 4.
Determine the thickness of the spacers needed by using the following formula and then position the spacers in the housing.
The thickness of the spacer at the differential section = the thickness of the solder (at the differential section) + gasket thickness 0.38 mm (.015 in.) - end play at differential section thickness.
The thickness of the spacer at the transfer shaft section = the thickness of the solder (at transfer shaft section) + gasket thickness 0.38 mm (.015 in.) - preload at transfer shaft section.
Standard Values:
Transfer shaft preload 0.10 - 0.15 mm (.0040 - .006 in.)
Differential end play 0 - 0.15 mm (0 - .006 in.)
6. After cleaning the gasket mounting service, apply petroleum jelly on the gasket surface of the transmission case and position the rubber coated steel gasket.
7. Install the converter housing and tighten the retaining bolts to 9-23 N-m (14-16 ft.lbs.) torque.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 21-31-02-90 . . . . . . . . . . . . . . . 3.6 Hrs.
FAILURE CODE: 71 - Oil Leak