Instruction manual

Adjust deflection of the fan belt (Fig. 33) by turning the

alternator. Normal deflection of the belt equals 8-14 mm with

an effort of 4 kgf (39 N) applied to it.

When using water as a coolant, periodically remove from the

cooling system scale and dirt by flushing them with a fast jet of

clean water. Flush the engine separately from the radiator so that

rust, scale and sediment from the engine cooling jacket do not

clog the radiator (Fig. 34). Prior to flushing the engine, remove

the thermostat.

Drain coolant from the cooling system through two cocks. One

of them is arranged on the radiator lower reservoir, the other on

the cylinder block. When draining the coolant, remove the

radiator cap and open the cock.

When draining the coolant from the engine cooling system,

drain also the fluid from the heating system through the cock 15

(Fig. 32) located on the inlet manifold of the cab heater radiator.

Access to the cock is from the front, from below of the

automobile.

Notes.

1. On some automobiles, the engines 4178 are installed, with

feeding coolant to cylinder head completed with the pump of the

cooling system in which design the ball bearings are applied.

2. On some automobiles, the visco coupling of the fan drive is

installed, its purpose is to reduce fuel consumption, fan noise. It also

reduces the time required for cold engine warm up and maintains the

engine efficient operating condition. Keep the outer surface of the

coupling clean.

Fig. 34. Flushing cooling systemFig. 33. Checking fan belt

tension