Front oil seal
1. Drain the engine oil (see Chapter Routine maintenance).
2. Remove the accessory drive belt (see section Removal, installation and adjusting the tension of the auxiliary drive belt).
3. Remove the accessory belt pulleys and the outer timing belt covers, then bring the engine to the TDC position of the end of the compression stroke of the piston of the first cylinder and remove the timing belt and crankshaft toothed wheel (see sections Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke, Removal and installation the timing belt and its covers, Removal and installation the tensioner and timing belt gears).
4. Drill a couple of small holes in the end surface of the seal and screw self-tapping screws into them (try not to damage the walls of the socket and the surface of the shaft journal). Using pliers to grasp the screw heads, remove the seal from its seat.
5. Without using any solvents, wipe the walls of the seal seat and the surface of the shaft journal with a clean, lint-free cloth. Sand down all burrs, nicks and roughness that could cause the new seal to fail.
6. Lubricate the lips of the new seal and insert it into the socket in the casing.
7. Using a hammer blow on a mandrel of suitable diameter, press the seal into the casing. A socket head of suitable size or a section of pipe of the corresponding diameter can be used as a mandrel. The mandrel must rest exclusively on the hard outer edge of the seal.
8. Reinstall all components removed for access purposes and adjust the belt tension (see sections Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke, Removal and installation the timing belt and its covers, Removal and installation the tensioner and timing belt gears).
9. Fill the engine with the required amount of motor oil of the required grade.
Replacing the front oil seal housing gasket
1. Perform the procedures described in paragraphs 1 through 3, then remove the oil pan (see section Pallet - removal, inspection and installation).
2. Unscrew the oil seal housing mounting bolts in several steps.
3. Using rotary and reciprocating movements, carefully remove the casing assembly with the oil seal from the crankshaft journal.
4. Remove the old gasket from the mating surface of the cylinder block. Using extreme caution, clean the mating surfaces of the housing and cylinder block, completely removing all traces of the old gasket material (use a scraper or a penknife).
5. If necessary, remove the old seal from its socket in the casing by carefully prying it up with a flat-head screwdriver.
6. Thoroughly wipe the casing and inspect it for cracks and signs of deformation of the mating surfaces. Place the casing on a workbench, mating surface down. If removed, press a new seal into the seat by pressing a wooden block against it and tapping the latter with a hammer.
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7. Lubricate the mating surface of the cylinder block with a universal sealant and press the new housing gasket onto it.
8. Wrap the crankshaft journal with tape.
9. Lubricate the inner lips of the seal with clean engine oil, bring the housing assembly to its standard place on the block and, using rotational and reciprocating movements, seat it on the crankshaft journal, pressing it tightly against the block.
10. Screw in the casing mounting bolts and tighten them in several stages to the required force.
Note: Please remember that the casing is made of soft aluminum alloy and can be easily damaged if the bolts are not tightened evenly.
11. Install the oil pan in place (see section Pallet - removal, inspection and installation).
12. Reinstall all other components removed for access purposes, remembering to adjust the belt tension (see sections Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke, Removal and installation the timing belt and its covers, Removal and installation the tensioner and timing belt gears).
13. Finally, fill the engine with the required amount of motor oil of the required grade.
Rear oil seal
1. Perform the procedures in paragraphs 1 through 3, then remove the oil pan (see section Pallet - removal, inspection and installation).
2. Remove the gearbox from the engine (see Chapter Transmission).
3. Remove the flywheel (see section Flywheel - removal, inspection and installation), as well as the friction disc and clutch basket assembly (see Chapter Clutch).
4. If equipped, unscrew the mounting bolts and remove the intermediate plate from the cylinder block.
5. Loosen and remove the rear oil seal housing mounting bolts in several steps.
6. Using rotary and reciprocating movements, carefully remove the casing assembly with the seal from the shaft journal.
7. Remove the gasket from the block and clean the mating surface.
8. The rear oil seal is replaced together with the casing and is not supplied individually.
9. Lubricate the mating surface of the block with a universal sealant and install a new housing sealing gasket on it.
10. The original Skoda seals are usually supplied with a protective plastic sleeve to prevent damage to the seal on the edges of the keyway when putting the assembly on the shaft journal. When installing a non-original seal, wrap the journal with tape.
11. Lubricate the inner lips of the new seal with clean engine oil, then use a rotary-translational motion to carefully place the assembly on the journal, pressing it tightly against the block.
12. Screw in the mounting bolts and tighten them evenly in several stages to the required force.
Note: Please remember that the casing is made of soft aluminum alloy and can be easily damaged if the bolts are not tightened evenly.
13. Install the oil pan (see section Pallet - removal, inspection and installation).
14. Install the friction disc and clutch basket assembly (see Chapter Clutch).
15. Install the gearbox in place (see Chapter Transmission).
16. Finally, fill the engine with the required amount of engine oil of the required grade (see Chapter Routine maintenance).