1114151 Replacing crankshaft radial seal (N51)

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Necessary preliminary tasks:

Remove transmission See 2300017 REMOVING AND INSTALLING TRANSMISSION (GS6-17BG) N51/N52/N52K/N53 or 2400050 INSTALLING REPLACEMENT TRANSMISSION (GA6L45R) .
Remove FLYWHEEL .

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

Fig 1: Locating Crankshaft Radial Seal Openings

Courtesy of BMW OF NORTH AMERICA, INC.

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 And Removal Opening

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Fit special tool 11 9 200 EXTRACTOR . 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: Locating Metal Screws Onto Removal Opening

Courtesy of BMW OF NORTH AMERICA, INC.

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 Sealing Surface And Running Surface Of Radial Shaft Seal

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 Crankshaft Radial Seal With Grooves 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 Sealing Compound And Bottle Of Injector

Courtesy of BMW OF NORTH AMERICA, INC.

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 And Groove With Radial Shaft Seal On Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

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 on preassembled radial shaft seal.

Fig 8: Identifying Special Tools (11 9 182 And 11 9 183) On Spacer Ring

Courtesy of BMW OF NORTH AMERICA, INC.

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

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: Inserting Brush Into Grooves Using Loctite Primer

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 11: Filling Grooves Flush Using 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: Inserting Brush Into Grooves Using Loctite Primer

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.