Front Crankshaft Seal: Service and Repair

11 14 005 - Replacing front crankshaft radial seal (N54)





Special tools required:





Necessary preliminary tasks:
- Remove vibration damper Service and Repair





Important!
Do not release central bolt.
Risk of damage!
If the central bolt is released, the sprocket wheels of the timing chain and the oil pump will no longer be non-positively connected to the crankshaft. The camshafts may turn in relation to the crankshaft.
The timing must be adjusted Adjustments again.





Turn back special tool 11 9 222.
Push special tool 11 9 221 onto crankshaft hub.

Important!
When screws are tightened down (special tool 11 9 224), crankshaft radial seal is pressed inwards approx. 1 mm and thus slackened for subsequent removal.

Insert screws (special tool 11 9 224) and tighten down to approx. 20 Nm.





Screw special tool 11 0 371 to 80 Nm into crankshaft radial seal.
Screw in spindle 11 0 372.
Release crankshaft radial seal from crankcase.

Note:
Repeat this operation several times if necessary.





Carefully saw open crankshaft radial seal (1) at cutting line (2).
Remove crankshaft radial seal (1) from special tool 11 0 371.





Important!
The following text describes installation and sealing between the engine block and crankshaft radial seal.
The engine block will not be leakproof at the outside of the crankshaft radial seal if you fail to comply with the individual work steps and the work sequence.





Installation:
Clean sealing surface (1) and degrease thoroughly in area of crankcase partition.
Apply a light coat of oil to running surface (2) for crankshaft radial seal.

Note:
Graphic shows an N42 engine by way of example.





Screw special tool 11 9 232 with screws (special tool 11 9 234) to crankshaft hub.





Note:
Support bushing (1) is contained in scope of delivery of crankshaft radial seal (2).
When crankshaft radial seal (2) is installed, only support bushing (1) may be used as a slip bushing.
Crankshaft radial seal (2) has a groove on both left and right sides.

Important!
After installation, the grooves must be filled with sealing compound.





Remove screw caps (1) from injector (2).

Screw on metering needle.
Insert piston for pressing out or use special tool 11 4 370.





Push support bushing (1) with crankshaft radial seal (2) onto special tool 11 9 232.

Important!
Support bushing (1) remains on special tool 11 9 232 until crankshaft radial seal is drawn in.

Align groove (3) centrally to crankcase partition (4).

Coat both grooves (3) on crankshaft radial seal (2) with Loctite primer, manufacturer's number 171000, and expose to air for approx. one minute.





Draw crankshaft radial seal with special tool 11 9 231 in conjunction with special tool 11 9 233 into crankcase until flush.





Before filling with sealing compound:
Insert brush with Loctite primer, manufacturer's number 171000, as far as possible into grooves (1) on crankshaft radial seal and coat crankcase partition on engine block.

Note:
Graphic shows an N42 engine by way of example.





Using injector/syringe (2), fill both grooves (3) flush with sealant.

Note:
Graphic shows an N42 engine by way of example.





Note:
Loctite primer, manufacturer's number 171000, binds the Loctite sealing compound, manufacturer's number 128357, and prevents leakage.

Coat surface of sealing compound in both grooves (1) with Loctite primer, manufacturer's number 171000.

Note:
Graphic shows an N42 engine by way of example.





Assemble engine.