Front Crankshaft Seal: Service and Repair

Replacement:

Preparation
- Remove belt pulley, harmonic balancer and hub. Service and Repair

Overview





- Remove, install belt pulley (12), vibration damper (13) and hub (14).
- Remove radial seal (16), refer to step 2 below.
- Clean and deburr mounting bore.
- Oil sealing lip of radial sea] (16), refer to step 4 below.
- Using insertion sleeve, special tool 119 589 01 14 00, install radial seal (16), refer to step 6 below.
Pay attention to installation position in the case of hubs (14) with running (wear groove) marks, refer to step 6 below.
- check for leaks with engine running.


Procedure

NOTE: An oil leak can be determined after spraying the dried and cleaned surrounding area with Mercedes-Benz white contrast spray 000 989 03 69.





1. Check hub of belt pulley for running (wear groove) marks.
- If running marks are present, install radial seal offset 3 mm to the inside (see step 6 below).





2. Lever out radial seal with a screwdriver.

CAUTION: Do not damage crankshaft and mounting bore for the radial seal, use clean cloths as a base.

3. Deburr edge of mounting hole for the radial seal.
4. Oil sealing lip of the radial seal.

CAUTION:
- Do not use grease.
- Grease prevents the angled webs on the sealing lip transporting back the engine oil.





Legend
A - Standard position of radial seal
B - Repair position of radial seal

5. Fit radial seal (16) on to the side of the insertion sleeve 119 589 01 14 00 and draw in as far as the stop with bolt (11) and 4 Belleville spring washers (11a).

CAUTION: The radial seal (16) must be at right angles to the hub otherwise it will riot provide a proper seal.

6. If the hub has running scores, position radial seal (16) 3 mm offset to the inside. To do this, fit radial seal (16) onto the side b of the insertion sleeve 119 589 01 14 00 and draw in as far as the stop.
7. Install the pulley, vibration damper and hub.
8. Run engine and check for leaks.