Hydraulic pushers of the ZMZ-409 engine, made in the form of cylindrical pushers and located between the camshaft and valves, combine two functions: transferring force from the camshaft to the valves and eliminating gaps in their drive

An external sign of wear on the valve stem seals is the short-term appearance of blue smoke from the exhaust pipe after starting the engine and when braking the engine after a long drive under load

The cylinder head is usually removed to replace its gasket, valves, valve guides, repair the head, as well as for a complete engine overhaul

Remove

Remove fan drive belt

Loosen the two bolts securing the generator to the bracket

To check and remove the idle speed controller (IAC), you need to remove the throttle assembly completely (see "Removing the throttle assembly") or partially

Over time, during operation, the gasket under the engine head cover loses its elasticity and strength and oil leaks from under the cover

Engine coolant pump

The fluid pump arrangement is shown in fig. 1.

The engine has two hydraulic tensioners of the same design - for the upper and lower chain

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

The ignition distributor with a built-in Hall sensor produces voltage pulses, which the switch converts into current pulses in the primary winding of the ignition coil