11 21 500 Replacing crankshaft (S54): Notes

WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.

(engine removed)

Remove cylinder head. Refer to 11 12 100 Removing and installing/sealing cylinder head (S54) .

Remove lower timing case cover.

Remove pistons. Refer to 11 25 530 Removing and installing/replacing all pistons (S54) .

Remove flywheel.

Remove end cover at rear. This task is described in the section Replacing crankshaft radial seal. Refer to 11 14 151 Replacing crankshaft radial seal (transmission side) .

Checking axial clearance: if permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary. Refer to 11 21 CRANKSHAFT AND BEARINGS S54 .

Fig 1: Checking Axial Clearance

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Holders for oil lines are fitted on main bearing caps 3 and 5.

CAUTION: Holders (1 and 2) are different.

Holder (1) with elongated hole in vertical direction.

Holder (2) with elongated hole in horizontal direction.

Fig 2: Identifying Holders

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NOTE: Main bearing caps 1 to 5 are marked on exhaust side.

Main bearing caps 6 and 7 are not marked.

Main bearing cap 6 is guide bearing.

Remove screws securing main bearing caps.

Remove main bearing caps 1 to 7.

Lever out crankshaft.

Fig 3: Locating Main Bearing Cap Marks

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CAUTION: The increment gear cannot be released without the screws being damaged or destroyed.

The Parts Service offers a crankshaft with fitted increment gear.

If in an exceptional case increment gear has to be removed:

CAUTION: Protect crankshaft against damage.

Fig 4: Removing Increment Gear

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Release screws, drill out screw heads if necessary.

Installation:

Replace increment gear and screws.

Tighten down screws to 5 N.m.

Mark 45° angle on screw head and sensor gear.

Fig 5: Replacing Increment Gear

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CAUTION: Screws can be tightened down to max. 45°.

Tighten down with 40° to 45° torsion angle.

If necessary, remove sprocket wheel: release screw in bore (1). Detach sprocket wheel from crankshaft.

Fig 6: Removing Sprocket Wheel

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NOTE: Sprocket wheel is secured with an adapter sleeve (1) to crankshaft.