Assign piston to the cylinder bore - AR03.10-P-7021-03AMG

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ENGINE 156, 159

Connecting rod (2) and connecting rod bearing cap (1) are cracked (broken). They must not be swapped over with each other or installed the wrong way round.

The dimensional accuracy will no longer be obtained otherwise.

When installing new connecting rods (2) and new piston (3) observe the following installation instructions. Since the new piston is delivered without a travel direction arrow the edge of the piston (arrow a) and the connecting rod groove (arrow b) for the connecting rod bearing (2a) during installation.

Assignment of pistons (3) cylinder 1. to 4.

When assembling the piston (3) and connecting rod (2) the cast in piston edge (arrow a) and the connecting rod groove (arrow b), the connecting rod bearing shell (2a) must be laid in aligned to each other as shown in the picture.

Compare positions of the arrows in the right picture with positions of the arrows in the next picture.

Fig 1: Piston Edge And Connecting Rod Groove - Cylinder 1 To 4

Courtesy of MERCEDES-BENZ USA

Assignment of pistons (3) cylinder 5. to 8.

Fig 2: Piston Edge And Connecting Rod Groove - Cylinder 5 To 8

Courtesy of MERCEDES-BENZ USA

For assembly of the connecting rods (2) on the crankshaft the arrows or the triangular points (see Fig 3) must point on the connecting rod bearing caps (1) to each other, that means, the arrows or the triangular points on the connecting rod bearing caps (1) of cylinder 1 to 4 point to the vehicle rear and the connecting rod bearing caps on cylinders 5 to 8 point towards the vehicle front.

Fig 3: Connecting Rods Triangular Points

Courtesy of MERCEDES-BENZ USA