Interference fit of crankshaft bearing cap - AH03.20-P-4351-02VA

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The crankshaft bearing caps (main bearing cap (1), fitted bearing cap (2)) are machined together with the crankcase and must not be exchanged with each other.
The crankshaft bearing caps are fitted on the side in the crankcase and may only be mounted in one location. If the correct installation position is achieved then the semicircles (3) are in the direction of travel (arrow).
The crankshaft bearing caps are numbered consecutively on the semicircles (3), beginning with the first crankshaft bearing cap at the front.

Fig 1: Identifying Main Bearing Caps, Fitted Bearing Cap & Semicircles
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.