11 24 571 Replacing All Conrod Bearings (S54)

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(Piston removed)

CAUTION: The S54 engine has two types of conrod with different conrod bolts.

Differentiating Features:

Conrod bolt with M11x1.25 thread. Bolt head: bihexagonal 12 mm A/F.
Conrod bolt with M10x1.25 thread. Bolt head: Torx E12.

Fig 1: Identifying Conrod Bolts
Courtesy of BMW OF NORTH AMERICA, INC.

CAUTION: The procedure for replacing the conrod bolts and the tightening specifications are different. Mixing up the procedure for replacing the conrods and conrod bolts and the tightening specifications will result in serious engine damage.

CAUTION: Note grinding stages on crankshaft. Refer to ENGINE - TECHNICAL DATA .

NOTE: Classified conrod bearing shells color-coded "Yellow and Green" are installed in the model series.

The classification is removed when the conrod bearing shells are replaced.

Fig 2: Installing Conrod Bearing Shells In Conrod

Courtesy of BMW OF NORTH AMERICA, INC.

Install conrod bearing shells (1) color-coded "Blue" in conrod at top.
Install conrod bearing shells (2) color-coded "Red" in conrod at top.
Install piston. Refer to 11 25 530 REMOVING AND 530 INSTALLING/REPLACING ALL PISTONS (S54) .