Yaroslavl Engine Plant YMZ-536 Operation Manual page 88

Fig. 28. Thermostat arrangement in the service module:
1 – thermostats; 2 – cooling liquid feed channel from the
transmission heat exchanger; 3 – cooling liquid feed channel from
the water pump to the L/O HE; 4 – cooling liquid feed channel from
the engine; 5 – oil channel; 6- cooling liquid outlet pipe to the
radiator
The engines are equipped with the «Borg Warner» fan with a
viscous coupling.
The fan is driven by a poly-V belt from the pulley mounted on
the crankshaft front end.
The fan drive (Fig. 29) uses two ball bearings 180206 and one
bearing 180205. The bearings are single row, with two shields, and
filled with grease. During operation, no maintenance on the bearings
is required.
88
FAN AND FAN DRIVE