11 14 151 Replacing crankshaft radial seal (N52)

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Special tools required:

11 9 181
11 9 182
11 9 183
11 9 184
11 9 200

Necessary preliminary tasks:

Remove Transmission.
Remove Flywheel.

NOTE: Radial seal has six removal openings for removal with special tool 11 9 200.

Fig 1: Identifying Radial Seal

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NOTE: If necessary, remove rubber coating (1) on top side of radial seal and expose a removal opening (2) (see Fig 2).

Fig 2: Identifying Radial Seal Rubber Coating And Removal Opening

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Fit special tool 11 9 200. Insert metal screws into removal opening of radial seal and initially tighten without play (do not overtighten metal screws).

Screw in spindle (1) slowly and carefully and detach radial seal.

Fig 3: Identifying Special Tool (11 9 200) And Crankshaft Radial Seal Spindle

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Installation:

Clean sealing surface (1) and degrease thoroughly in area of housing partition.

Apply a light coat of oil to running surface (2) of radial shaft seal.

Fig 4: Identifying Radial Shaft Sealing And Running Surface

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Support sleeve (4) is supplied with radial shaft seal (1).

When radial shaft seal (1) is installed, only support sleeve (4) may be used as a slip sleeve.

Radial shaft seal (1) has a groove (2) on both left and right sides.

IMPORTANT: After installation, grooves (2) must be filled with sealing compound.

Fig 5: Identifying Radial Shaft Seal, Groove And Sleeve

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The seal between the engine block and radial seal is described below.

The engine block will not be leakproof at the outside of the radial seal if you fail to comply with the individual work steps and the work sequence.

NOTE: The required parts are available from the BMW Parts Service (EPC).

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

Screw on metering needle.

Insert piston for pressing out.

Injector (2) contains the sealing compound Loctite, manufacturer's number 128357.

Bottle (3) contains the primer Loctite, manufacturer's number 171000.

Fig 6: Identifying Screw Caps, Injector And Bottle Of Loctite (171000)

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Installation:

Fit support sleeve (4) with radial shaft seal (1) on crankshaft.

Align groove (2) centrally to housing partition (3).

Coat both grooves (2) on radial shaft seal (1) with Loctite primer, manufacturer's number 171000, and expose to air for approx. one minute.

Push radial shaft seal (1) by hand as far as possible onto running surface.

Carefully remove support sleeve (4).

Fig 7: Identifying Support Sleeve, Radial Shaft Seal, Groove And Housing Partition

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NOTE: Spacer ring (1) is supplied with radial shaft seal.

Screw special tool 11 9 182 with screws (special tool 11 9 184) to crankshaft.

Fit spacer ring (1) on preassembled radial shaft seal

Fig 8: Identifying Special Tool (11 9 182) And (11 9 184)

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Draw in radial shaft seal with special tool 11 9 181 in conjunction with special tool 11 9 183 until flush.

Then remove spacer ring again.

Fig 9: Identifying Special Tool (11 9 181) And (11 9 183)

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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 radial shaft seal and coat housing partition on engine block.

Fig 10: Using Loctite Sealing Compound (171000) On Groove (1 of 3)

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Fill both grooves (1) flush with Loctite sealing compound, manufacturer's number 128357.

Fig 11: Using Loctite Sealing Compound (171000) On Groove (2 Of 3)

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 12: Using Loctite Sealing Compound (171000) On Groove (3 Of 3)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.