Right oil seal (from the pulley side)
1. Remove the crankshaft pulley (see section Removal, condition check and installation of the front cover, timing chain and sprockets).
2. Carefully pry the seal out of the timing chain cover using a flat-blade screwdriver. Try not to damage the sealing surfaces of the cover and the crankshaft journal.
3. Alternatively, drill or punch a couple of small holes in the end face of the gland and screw screws into them. Now you can remove it from the cover by grasping the screw heads with pliers.
4. Carefully wipe and grind the walls of the oil seal seat, as well as the surface of the crankshaft journal - any roughness, burrs and scuffs that could lead to rapid failure of the new oil seal must be removed from the sealing surfaces.
5. Lubricate the lips of the new seal with clean engine oil and press/tap the latter with the lips inward into the socket in the casing flush with the outer surface of the timing chain cover. As a mandrel for seating the seal, you can use a socket head of the appropriate size or a section of pipe of a suitable diameter, which should rest only on the rigid outer edge of the end surface of the seal.
6. Use a rag to remove any traces of oil, then install the crankshaft pulley (see section Removal, condition check and installation of the front cover, timing chain and sprockets). Note that when fixing the crankshaft from turning during the installation of the pulley, it is necessary to remove the oil pan in order to ensure the possibility of monitoring the position of the thrust washer.
Left oil seal (from the flywheel side)
1. Remove the flywheel (see section Removal, condition check and installation of the flywheel).
[Data taken from an online portal SkodaBook]
2. Carefully pierce or drill two holes in the end surface of the seal and screw self-tapping screws into them. Remove the seal from its seat in the cylinder block wall, grasping the screw heads with pliers.
3. Carefully wipe and grind the walls of the oil seal seat, as well as the surface of the crankshaft journal - any roughness, burrs and scuffs that could lead to rapid failure of the new oil seal must be removed from the sealing surfaces.
4. Lubricate the lips of the new seal with clean engine oil and press/tap the latter with the lips inward into the socket in the engine crankcase.
5. Manually place the new seal on the crankshaft journal, carefully moving it over the shoulders and press it into the socket so that the outer end is pressed evenly along the entire perimeter by the thrust surface of the shoulders. If necessary, the seal can be tapped into the socket with a soft-faced hammer.
6. Remove any remaining grease and reinstall the flywheel (see section Removal, condition check and installation of the flywheel).