11 21 500 Replacing Crankshaft (S54)

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(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 530 INSTALLING/REPLACING ALL PISTONS (S54) .

Remove flywheel. See 11 22 500 Removing And Installing Or Replacing Flywheel (M52/S52/M52TU/M54/S54)

Remove end cover at rear. This task is described in the article "Replacing crankshaft radial seal".

Checking axial clearance:

If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary. Refer to ENGINE - TECHNICAL DATA .

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: Locating Holders For Oil Lines On Main Bearing Caps

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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 Mark On Main Bearing Cap

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

A crankshaft with fitted increment gear is available. If in an exceptional case increment gear has to be removed:

CAUTION: Protect crankshaft against damage.

Release screws, drill out screw heads if necessary.

Fig 4: Identifying Increment Gear

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Installation:

Replace increment gear and screws.

Tighten down screws to 5 N.m.

Mark 45° angle on screw head and sensor gear.

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

Tighten down with 40° to 45° torsion angle.

Fig 5: View Of Increment Gear

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If necessary, remove sprocket wheel:

Release screw in bore (1).

Detach sprocket wheel from crankshaft.

Fig 6: Identifying Screw In Sprocket Wheel Bore

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

Installation:

Check adapter sleeve (1) for damage and correct installation position.

Fig 7: Locating Adapter Sleeve
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Installation:

Align adapter sleeve of sprocket wheel to locating bore of crankshaft and fit sprocket wheel.
Apply a thin coat of screw retaining compound to screw thread (1).

Insert screw.

Tighten down crankshaft sprocket wheel to 10 N.m.

Fig 8: Installing Sprocket Wheel

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CAUTION: Observe grinding stage of crankshaft. Refer to ENGINE - TECHNICAL DATA .

Replace main crankshaft bearing shells. Refer to 11 21 531 REPLACING ALL CRANKSHAFT MAIN BEARING SHELLS (S54) .

Replace conrod bearing shells. Refer to 11 24 571 REPLACING ALL CONROD BEARINGS (S54) .

Replace grooved ball bearings in crankshaft. Refer to 11 21 571 REPLACING GROOVED BALL BEARING IN CRANKSHAFT (M52 / S52 / M52TU / M54 / S50 / S54) .