Removal
1. Remove the gearbox (see chapter 7A).
2. Remove the drive disk (see subsection 13).
3. Inspect the oil seal, pan, cylinder block surface, and oil seal housing for signs of oil leakage. Sometimes a leak from the pan gasket is mistaken for an oil leak from the rear seal.
4. Unscrew the crankshaft rear oil seal housing bolts.
5. Install two bolts into the mounting bolt holes provided in the oil seal housing. Carefully tighten the screws in small increments until the oil seal housing is released from the cylinder block. Remove the cover.
6. Remove the crankshaft rear oil seal from the housing. Inspect the surface of the crankshaft for chips, grooves and other defects.
Installation
7. Clean and inspect the oil seal housing.
8. Lightly lubricate the outer surface of the oil seal with engine oil.
Note 1: in the absence of direct instructions in the manufacturer's instructions, do not lubricate the inner surface of the oil seal that is in contact with the crankshaft - the oil seal is installed dry. Failure to comply with this requirement may result in oil seal leakage after assembly. Place the oil seal into the housing (make sure that the sealing lip of the oil seal is facing towards the engine) and carefully insert the elements into their original location. A special tool can be purchased from your local parts store. The device should have a diameter slightly smaller than the outer diameter of the oil seal. When the oil seal is inserted, the device rests against it, and the device is struck with a hammer.
Note 2: Do not insert the oil seal to a depth greater than the original depth.
9. Apply a 5mm thick bead of RTV sealant to the housing/cylinder block interface.
10. Press the casing to the block by threading the rear shank of the crankshaft through the oil seal seal so that it does not turn under.
11. Install the bolts and tighten them to the required torque.
12. Install the drive disk (see subsection 13).
13. Install the gearbox (see _ chapter 7).