11 21 001 Replacing crankshaft (B36A/B38A)

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Special tools required:

IMPORTANT:

Replace main bearing and connecting rod bolts.

When replacing the crankshaft, the main bearing shells and connecting rod bearing shells must be replaced.

There must be no oil in the blind holes (risk of cracking) .

Do not wash off bolt coating.

Incorrect assembly of the crankshaft bearing caps will result in damage to the crankcase.

Necessary preliminary tasks:

Removal:

Check crankshaft side clearance. Refer to technical data for CRANKSHAFT WITH BEARING .

Fit special tool 11 6 250 .

If the permitted side clearance is exceeded:

Check crankshaft and guide bearing shells.
Replace worn components.

Fig 1: Checking Crankshaft Side Clearance

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NOTE: All main bearing caps (1) are numbered within the highlighted area (bearing position 1 to 4).
The installation position must be maintained.
The main bearing cap 3 is installed as a thrust bearing.

Fig 2: Locating Position Number On Main Bearing Caps

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Loosen the screws in the sequence (8) to (1).

Remove all main bearing caps.

Fig 3: Crankshaft Main Bearing Caps Screws Tightening/Loosening Sequence

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IMPORTANT:

With the assistance of a second person, remove crankshaft and carefully place to one side.

Pay attention to oil hole in bearing shell.

Pay attention to installation position of CRANKSHAFT MAIN BEARING SHELLS .

Fig 4: Crankshaft

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Installation:

Replacement: Replace the CRANKSHAFT MAIN BEARING SHELLS .

Oil the bearing shells (1) to (4).

Both locating grooves of the bearing shells inside the crankcase and on the main bearing cap must be mounted on one side.

Fig 5: Positioning Grooves Of Bearing Shells On One Side

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Insert crankshaft (1).

Fig 6: Crankshaft

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IMPORTANT:

Do not install the main bearing cap in an incorrect position.

Do not install the main bearing cap in a position twisted by 180 degrees! Main bearing caps are coded to prevent incorrect assembly!

Align main bearing caps exactly.

Fit main bearing bolts.

Tighten main bearing bolts in sequence (1) to (8) (observe tightening specifications).

Tightening torque: 11 11 1AZ

Fig 7: Crankshaft Main Bearing Caps Screws Tightening/Loosening Sequence

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Check side clearance. Refer to technical data for CRANKSHAFT WITH BEARING .

Fig 8: Checking Crankshaft Side Clearance

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Coefficient of friction of crankshaft. Refer to technical data for CRANKSHAFT WITH BEARING .

Screw in all screws of vibration damper by hand.

Turn crankshaft evenly with special tool 00 2 010 and special tool 11 6 480 .

Fig 9: Turning Crankshaft With Special Tool (00 2 010)

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