The piston of the 1st cylinder is set to the position of the top dead center (TDC) of the compression stroke so that when carrying out work related to the removal of the timing chains, the installation of the gas distribution phases is not disturbed

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

Usually, the head gasket is replaced with the following damage:

• - Gas breakthrough into the cooling system;

Checking and replacing the air flow sensor ZMZ 405

Mass air flow sensor - thermopneumatic type IVKSH 407282000, installed in the intake system after the air filter

Since the hydraulic tensioners keep the chains constantly taut, regardless of chain stretch or shoe wear, there is no need to adjust the chain tension during operation

Relieve fuel pressure in the fuel system

Turn off the ignition and remove the "negative" terminal of the battery