Front Crankshaft Seal: Service and Repair

11 14 005 Replacing Front Crankshaft Seal (N55)

Special tools required:







Necessary preliminary tasks:
- Remove vibration absorber







IMPORTANT:
Do not release central bolt.
If the central bolt is released, the sprockets of the timing chain and the oil pump will no longer be non-positively connected to the crankshaft.
Intake and exhaust camshafts can turn in relation to crankshaft.
Risk of damage.







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

IMPORTANT: When screws are tightened down (special tool 11 9 224), the crankshaft seal is pressed inwards by approx. 1 millimetre and thus slackened for subsequent removal.

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







Screw special tool 11 0 371 with 80 Newton metres into the crankshaft seal.
Screw in spindle 11 0 372.
Release crankshaft seal from housing.
Repeat the operation several times if necessary.







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







IMPORTANT:
The following text describes installation and sealing between the engine block and crankshaft seal.
The engine block will not be leak proof at the outside of the crankshaft seal if you fail to comply with the individual work steps and the work sequence.







Installation note:
Clean sealing surface (1) and degrease thoroughly in area of housing partition.
Apply a light coat of oil to running surface (2) of crankshaft seal.
Graphic N42.







Push radial shaft seal (1) 11 9 235carefullv in direction of arrow on the special tool .







IMPORTANT:
11 9 235Special tool can only be fastened with 2 opposite bolts.
Determine hole pattern on special tool.

Screw special tool 11 9 235 with special tool 11 9 234 on crankshaft.







Align groove (2) of radial shaft seal (1) centred to the housing partition (3).

IMPORTANT: After installation, the grooves must be filled with sealing compound.







Draw in radial shaft seal with special tool 11 9 231 in conjunction with special tool 11 9 233 until flush.







Installation note:
Use primer 1.3 and liquid seal 1.4.

Prepare liquid sealing compound (1) in special tool 11 4 370.
Remove sealing caps (1) from injector (2).
Screw on metering needle.
Insert piston for pressing out.
Syringe (2) contains the sealing compound Loctite, manufacturer's number 128357.
Bottle (3) contains the primer Loctite, manufacturer's number 171000.







Before filling with sealing compound:
Moisten brush with Loctite primer, manufacturer's number 171000. Insert brush as far as possible into grooves (1) on crankshaft seal in order to coat housing partition on engine block.
Graphic N42.







Using syringe (2), fill both grooves (3) flush with Loctite sealing compound, manufacturer's number 128357.
Graphic N42.







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.
Graphic N42.







Assemble engine.