Front Crankshaft Seal: Service and Repair

Crankshaft Sealing Flange, Belt Pulley Side

Special tools, testers and auxiliary items required

• Trim removal wedge (3409)

• Assembly sleeve (T03004)

• Hand drill with plastic brush attachment

• Protective eyewear

• Silicone sealant (D 174 003 A2)

Removing

- Remove ribbed belt for A/C compressor => [ Ribbed Belt ] Ribbed Belt.

- Secure crankshaft => [ Crankshaft, Locking ] Procedures.

- Remove belt pulley on crankshaft.

- Remove tensioning element - 1 -.





- Remove bolts - 2 -.

- Begin at alignment bushings - arrows - to press off sealing flange - 1 - using a suitable screwdriver - A -.





- Use trim removal wedge (3409) to support screwdriver in order to prevent damage to sealing flange of cylinder block.

Sealing flange is damaged while removing.

- Press off sealing flange completely.

• After removing sealing flange, clean trim removal wedge (3409) which is intended for the removal of interior equipment parts.

Installing

CAUTION!
To prevent injuries from shavings, wear protective goggles and protective clothing.

- Remove remainder of sealant from cylinder block e.g. using a rotating plastic brush.

CAUTION!
Make sure that no sealant residue enters the engine.

- Clean sealing surface of cylinder block and crankshaft journals; they must be free of oil and grease.

• Do not additionally oil or grease sealing lip of sealing flange!

• The following work steps must be followed so that the sealing lip of sealing flange does not roll itself up when installing.

- Widen sealing lip of new sealing flange as depicted using assembly sleeve (T03004).





The surface - A - is the outer side.

- After a short time, remove assembly sleeve (T03004 ) and slide it rotated 180° into sealing ring.





Assembly sleeve (T03004) must stand out approximately 3 mm on the inner side - B -. The surface - A - is the outer side. The surface - B - is the inner side (sealing surface).

- Cut tube nozzle at front marking (diameter of nozzle approximately 2 mm).





• The sealing flange for crankshaft belt pulley side must be installed within 5 minutes after application of sealant.

- Apply sealant bead - A - as depicted into groove of sealing flange.





• Width of sealant bead: 2.5 to 3.0 mm

• Height of sealant bead above sealing surface: Approximately 1.0 mm

- Insert sealing flange using assembly sleeve ( T03004) on crankshaft journals and press uniformly on cylinder block.





- Tighten bolts - A - uniformly in diagonal sequence.

The rest of installation follows the reverse of the removal procedures. When doing this note the following:

• Remove locking pin (T40069) from cylinder block at rear and screw in plug.

Tightening Specifications