Table of contents: Drive shaft seals ↓ Speed sensor seat sealing ring…↓ Gear shift drive control rod seal ↓
Transmission oil leaks are most often associated with wear or mechanical damage to seals or O-rings. Replacing these sealing devices is quite simple and does not require removing the transmission from the vehicle.
Drive shaft seals
1. The seals are located on both sides of the gearbox housing where the drive shafts enter them. Jack up the car and place it on supports. A sign of oil leakage through the seal is streaks on the walls of the manual transmission housing directly under the corresponding drive shaft.
2. Remove the drive shaft(s) (see Chapter Clutch and drive shafts).
3. Using a special tool, a pry bar, or a large flat-blade screwdriver, remove the old oil seal from its seat in the transmission housing.
4. Using a socket head of the appropriate size or a section of pipe of the appropriate diameter as a mandrel, seat the new seal in its regular place. Make sure that the seal is seated in the socket strictly perpendicularly and to its full depth.
Note: The mandrel should only rest against the hard outer edge of the end face of the seal.
5. Lubricate the seal lips with transmission oil.
6. Reinstall the drive shaft(s), being careful not to damage the lips of the new seal(s).
Speed sensor seat sealing ring (speedometer drive assemblies)
1. The vehicle speed sensor (VSS) is mounted on the gearbox housing. Inspect the housing for signs of oil leakage through the O-ring of the sensor seat/speedometer drive assembly.
2. Disconnect the electrical wiring from the VSS, then loosen the hold-down bolt and remove the speedometer drive assembly with sensor from the transmission.
3. Using a scriber or a thin-tipped screwdriver, remove the sealing ring from the removed assembly (it is best to use a device in the form of a thin rod bent at the end).
4. Place the new O-ring into the receiving groove on the speedometer drive gear housing, after having lightly lubricated it with transmission oil.
5. Installation is carried out in reverse order.
Gear shift drive control rod seal
1. Jack up the car and place it on supports.
2. Disconnect the gear shift control rod from the fork clamp (see section Removal and installation gear shift drive components).
3. Knock out the roll pin and remove the fork clamp and dust cover.
4. Remove the control rod seal from its seat.
5. Install a new oil seal in place of the removed one.
6. Install the boot and connecting fork clamp in place, securing the latter with a cylindrical pin.
7. Connect the control rod (see section Removal and installation gear shift drive components).
8. Lower the car to the ground.