Front Crankshaft Seal: Service and Repair

NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

1. Remove belt pulley/vibration damper.
2. Inspect bearing surface of hub of belt pulley/vibration damper.

NOTE: If bearing seal lip bearing surface of the crankshaft has grooves worn into it, use repair radial shaft seal with sealing lip offset 2 mm to inside or press in standard radial seal about 2 mm deeper.

3. Pry out radial shaft seal (8) with screwdriver.

CAUTION: Do not damage crankshaft and mounting hole for radial shah seal (8). Use clean cloth as base.

4. Deburr edge of mounting hole for radial seal (8) inspect.
5. Oil radial shaft seal (8) at sealing lip.

CAUTION: Do not use grease. Grease prevents the return swirl on the sealing lip of the radial shaft seal (8) feeding back the engine oil.

6. Fit radial shaft seal (8) onto insertion sleeve (1).
7. Fit insertion sleeve (01) on so that groove in insertion sleeve (01) is aligned with woodruff key (7).
8. Pull insertion sleeve (01) in with bolt (5) and 4 dished washers (6) as far as stop.

NOTE: The radial shaft seal (8) must be positioned at right angles to crankshaft bearing journal otherwise it will not provide a proper seal.

9. Install belt pulley/vibration damper.
10. Run engine and check for leaks.

NOTE: An oil leak can be determined after spraying the cleaned and dried surrounding area with Mercedes-Benz white contrast spray.