The cylinder head gasket is replaced if it is damaged
The main signs of damage to the head gasket:
On the ZMZ-402 engine, before removing the filter, drain the oil from it by unscrewing the plug
Unscrew the emergency oil pressure switch at the bottom of the filter
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
