Determine Position Of Cam Of High Pressure Fuel Pump - AR07.02-P-1020-04MRT

Engine 256.9

CHECK VALUES FOR FUEL HIGH-PRESSURE PUMP

Number	Designation		Engine 256
BE07.02-P-1001-03MRT	Distance of flange contact surface to roller tappet pump system	mm	29, 3 +0, 2

Check whether cylinder 1 is positioned at ignition TDC.
Engine must be set to ignition TDC on cylinder 1. Measurement errors and engine damage will occur otherwise.

The TDC marking on the vibration damper must match with the marking on the crankcase.
Clean contact surface of high pressure fuel pump on high pressure fuel pump housing.
Check for absolute cleanliness.

Measurement errors and engine damage will occur otherwise.

Do not use any sharp-edged tools or abrasive paper. The contact surface will otherwise be damaged.
Measure from contact surface of high pressure fuel pump to contact surface on roller tappet, write down clearance dimension (E) and compare with specified value.
Move the digital vernier caliper to zero position before starting the measurement. Measurement errors and engine damage will occur otherwise.

Commercially available devices/tools

Digital vernier caliper

Courtesy of MERCEDES-BENZ USA