Notes on position of engine number - AH01.00-P-0001-01D
Engine 112, 113, 120, 137, 271, 272, 273, 275, 285, 628, 629, 642, 651
Courtesy of MERCEDES-BENZ USA
Shown on engine 275
The engine number is located on the upper right transmission flange.
With OM 642 the engine number is located on the left front on the cylinder crankcase below the vacuum pump
With OM 651 the engine number is located on the left side on the cylinder crankcase below the vacuum pump