11 14 005 Replacing front crankshaft seal (N55) - up to 02.2014

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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!

Fig 1: Identifying Central Bolt

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Screw special tool 11 0 371 to 80 Nm into crankshaft seal.

Screw in spindle 11 0 372 .

Release crankshaft seal from housing.

Repeat the operation several times if necessary.

Fig 2: Removing Crankshaft Seal From Housing

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Carefully saw open crankshaft seal (1) at cutting line (2).

Remove crankshaft seal (1) from special tool 11 0 371 .

Fig 3: Cutting Crankshaft Seal From Special Tool

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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.

NOTE: Illustrations shows N42 engine.

Fig 4: Identifying Sealing Surface And Running Surface

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

Fig 5: Pushing Radial Shaft Seal Onto Special Tool

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IMPORTANT: 11 9 235 Special 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.

Fig 6: Installing Special Tool Onto Crankshaft

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

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

Fig 7: Align Groove Of Radial Shaft Seal

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

Fig 8: Installing Radial Shaft Seal

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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.

Fig 9: Identifying Loctite Sealing Compound Syringe, Sealing Caps, And Loctite Primer Bottle

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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.

NOTE: Illustrations shows N42 engine.

Fig 10: Inserting Brush Into Grooves On Crankshaft Seal

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

NOTE: Illustrations shows N42 engine.

Fig 11: Filling Grooves With Loctite Sealing Compound

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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: Illustrations shows N42 engine.

Fig 12: Inserting Brush Into Grooves On Crankshaft Seal

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Assemble engine.