11 14 005 Replacing front crankshaft seal

Special tools required:

11 0 371
11 0 372
11 4 370
11 9 221
11 9 222
11 9 224
11 9 231
11 9 232
11 9 233
11 9 234

Necessary preliminary tasks:

Remove VIBRATION DAMPER .

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 to the crankshaft can warp.

The timing must be ADJUSTED again.

Fig 1: Identifying 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.

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

Fig 2: Identifying Special Tool (11 9 222) (11 9 224) And (11 9 222)

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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 3: Screwing Special Tool (11 0 371) Into Crankshaft Seal

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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: Identifying Crankshaft Seal And Cutting Line With Special Tool (11 0 371)

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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.

Illustration N42.

Fig 5: Identifying Sealing Cleaning Area And Running Surface Of Crankshaft Seal

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

Fig 6: Screwing Special Tool (11 9 232) With Screws (Special Tool (11 9 234)) To Crankshaft

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NOTE:

Support sleeve (1) is supplied with crankshaft seal (2).

When crankshaft seal (2) is installed, only support sleeve (1) may be used as a slip sleeve.

Crankshaft seal (2) has a groove on both left and right sides.

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

Fig 7: Identifying Sleeve And Crankshaft Seal

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

Screw on metering needle.

Insert piston for pressing out or use special tool 11 4 370.

Fig 8: Identifying Screw Caps And Injector

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

IMPORTANT: Support sleeve (1) remains on special tool 11 9 232 , until crankshaft seal is drawn in.

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

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

Fig 9: Identifying Support Sleeve, Crankshaft Seal, Groove, Housing Partition And Special Tool (11 9 232)

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

Fig 10: Identifying Special Tools (11 9 231) And (11 9 233)

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Before filling with sealing compound:

Insert brush with Loctite primer, manufacturer's number 171000, as far as possible into grooves (1) on crankshaft seal and coat housing partition on engine block.

Graphic shows an N42 engine by way of example.

Fig 11: Inserting Brush Into Grooves On Crankshaft Seal

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

Graphic shows an N42 engine by way of example.

Fig 12: Filling Both Grooves Flush With Sealant Using Injector/Syringe

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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 shows an N42 engine by way of example.

Fig 13: Coating Surface Of Sealing Compound In Both Grooves With Loctite Primer

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Assemble engine.