11 14 005 Replacing front crankshaft seal (N52T)

Special tools required:

Necessary preliminary work:

Remove VIBRATION DAMPER

IMPORTANT: Do not release central bolt.
If the central bolt is released, the camshaft 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 Crankshaft Central Bolt

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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 ) crankshaft seal is pressed inwards approx. 1 mm and thus slackened for subsequent removal.

Fig 2: Pushing Special Tool 11 9 221 Onto Crankshaft

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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 seal.

Screw in spindle 11 0 372 .

Release crankshaft seal from housing.

Repeat the operation several times if necessary.

Fig 3: Releasing 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 4: Removing Crankshaft Seal

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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 leakproof 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.

Fig 5: Identifying Sealing Surface And Running Surface

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

Fig 6: Pushing Radial Shaft Seal On Special Tool 11 9 235

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IMPORTANT: Special tool 11 9 235 can only be attached 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 7: Screwing Special Tool 11 9 235 With 11 9 234 On 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 8: Aligning Groove Of Radial Shaft Seal Centered To Housing Partition

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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 9: Drawing Radial Shaft Seal With Special Tool 11 9 231

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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 screw caps (1) from injector (2).

Screw on metering needle.

Insert piston for pressing out.

Fig 10: Identifying Liquid Sealing Compound, Bottle, Screw Caps From Injector

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Injector (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.

Fig 11: Inserting Brush Into Grooves On Crankshaft Seal

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

Graphic N42.

Fig 12: Filling Both Grooves Flush 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.

Graphic N42.

Fig 13: Coating Surface Of Sealing Compound In Both Grooves

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Assemble engine.