Replacing crankshaft (B36 engine) (Cooper base)

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Special tools required:

11 6 250
00 2 010
11 6 480

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

Preliminary work needed:

Removal:

Check crankshaft SIDE CLEARANCE .

Fit special tool 11 6 250.

If the permitted side clearance is exceeded:

Check crankshaft and guide bearing shells.
Replace worn components.

G11644971

Courtesy of BMW OF NORTH AMERICA, INC.

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.

G13794599

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove all main bearing caps.

Fig 1: Main Bearing Caps And Screws Loosening Sequence

G11671301

Courtesy of BMW OF NORTH AMERICA, INC.

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 .

G11671302

Courtesy of BMW OF NORTH AMERICA, INC.

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.

G13794602

Courtesy of BMW OF NORTH AMERICA, INC.

Insert crankshaft (1).

G11671302

Courtesy of BMW OF NORTH AMERICA, INC.

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 2: Main Bearing Caps And Bolts Tightening Sequence

G11671301

Courtesy of BMW OF NORTH AMERICA, INC.

Check SIDE CLEARANCE .

G11644971

Courtesy of BMW OF NORTH AMERICA, INC.

Check crankshaft COEFFICIENT OF FRICTION .

Screw in all screws of vibration damper manually.

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

G11671307

Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work:

Install COUNTERBALANCE SHAFT .
Install all PISTONS .
Install FRONT BOTTOM TIMING CASE COVER .
Install BOTH TIMING CHAINS .
Assemble engine