Adjustment of the clearances between the rocker arms and the valves is carried out on a cold engine, with the cylinder head fastening nuts and the nuts for fastening the rocker arm axle struts tightened to the required torque.

Remove the cover of the rocker arms, for this:

Регулировка зазоров в приводе клапанов ЗМЗ-402Регулировка зазоров в приводе клапанов ЗМЗ-402

Disconnect the crankcase exhaust pipe. Disconnect the hose of the vacuum regulator of the ignition distributor

With a 10 head, unscrew the six valve cover bolts

Регулировка зазоров в приводе клапанов ЗМЗ-402Регулировка зазоров в приводе клапанов ЗМЗ-402

Remove the valve cover

Removing the gasket

We install the piston of the 1st cylinder in the VMT. compression stroke.

Регулировка зазоров в приводе клапанов ЗМЗ-402Регулировка зазоров в приводе клапанов ЗМЗ-402

The third mark on the pulley should align with the lug on the timing sprocket cover

The distributor slider must be in the position of the 1st cylinder

This will close the inlet and outlet valves and allow the rocker arms to swing freely.

Check the gap between the rocker arm and the valve with a feeler gauge. With normal clearance, the dipstick should move between the rocker arm and the end of the valve with little effort.

The size of the gap is shown in the table.

The size of the clearances in the valve drive

Cylinder number - Valve - Gap size, mm

one

Intake 0.40 - 0.45

Graduation 0.35 - 0.40

2

Intake 0.40 - 0.45

Graduation 0.40 - 0.45

3

Intake 0.40 - 0.45

Graduation 0.40 - 0.45

4

Intake 0.40 - 0.45

Graduation 0.35 - 0.40

If the gap size differs from that indicated in the table:

Регулировка зазоров в приводе клапанов ЗМЗ-402Регулировка зазоров в приводе клапанов ЗМЗ-402

unscrew the locknut with a 14 wrench, while keeping the adjusting screw from turning with a 11 wrench.

Then, turning the adjusting screw with a wrench (or a screwdriver inserted into the slot), adjust the gap, periodically checking it with a feeler gauge.

Регулировка зазоров в приводе клапанов ЗМЗ-402Регулировка зазоров в приводе клапанов ЗМЗ-402

Then, while holding the adjusting screw, tighten the lock nut

Check the gap again with a feeler gauge. In the same way, adjust the clearance on the other valve of the 1st cylinder

Turn the crankshaft half a turn (180 °) and adjust the clearances in the valve drive of the 2nd cylinder.

Turn the crankshaft another half turn (180 °) and adjust the clearances in the valve drive of the 4th cylinder.

Turn the crankshaft another half turn (180 °) and adjust the valve clearances in the 3rd cylinder.

Advice

When we turn the crankshaft, it is good to look at the correct position on the distributor slider. On the end of the distributor, you can apply marks of the position of the slider with a marker or quick-drying paint.

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