11 14 151 Replacing Crankshaft Seal (N51) To 12/31/08

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Special tools required:

For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .

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

Necessary preliminary tasks:

Remove transmission . See 23 00 017 REMOVING AND INSTALLING TRANSMISSION (GS6-17BZ) N51/N52/N52K/N53 or 24 00 032 REMOVING AND INSTALLING AUTOMATIC TRANSMISSION (GA6L45R) .
Remove flywheel . See 11 21 500 REPLACING CRANKSHAFT (N51) .

NOTE: Radial seal has six removal openings for removal with special tool 11 9 200. See Fig 3.

Fig 1: Locating Radial Seal Portions

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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 Rubber Coating On Top Side Of Radial Seal

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Fit special tool. See Fig 3. 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)

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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 Running Surface Of Radial Shaft Seal

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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.

Fig 5: Identifying Radial Shaft Seal Parts

Courtesy of BMW OF NORTH AMERICA, INC.

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

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 Injector, Sealing Compound And Bottle

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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: Fitting Support Sleeve With Radial Shaft Seal On Crankshaft

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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. See Fig 8.

Fit spacer ring on preassembled radial shaft seal.

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

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Draw in radial shaft seal and spacer ring with special tool 11 9 181in conjunction with special tool 11 9 183. See Fig 9.

Then remove spacer ring again.

Fig 9: Identifying Special Tools (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: Identifying Grooves On Radial Shaft Seal

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

Fig 11: Filling Both Grooves Flush With Loctite Sealing Compound

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

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.