The oil pump is removed for replacement or repair when the pressure in the lubrication system drops below the permissible level, when the gears are noisy and the pressure reducing valve plunger is stuck

Remove the cylinder head

Remove the crankcase and crankcase gasket

The ignition distributor sensor (1908.3706) is installed on the ZMZ-402 engine - contactless, with a sensor (generator) of control pulses and built-in vacuum and centrifugal ignition timing controllers

Installing the cylinder head and valve mechanism D-245

If it is necessary to replace the valve seats, use the set of special mandrels shown in fig. 1.