The fan impeller has a diameter of 420 mm and is connected to the coolant pump drive through a viscous coupling.
The viscous coupling is manufactured by «Holset» or «Fichtel und Sachs». The engagement and disengagement of the viscous fan clutch depends on the engine temperature.
Fan start temperature:
- model engine «М62В44» — 91–99°С;
- model engine «М62В46» — 88–96°С.
The fan switch-off temperature is 60–65°C.
Axial clearance of the viscous coupling rotor, not more than 0.4 mm.
Radial clearance of the viscous coupling rotor, not more than:
- model engine «М62В44» - 0.65 mm;
- model engine «М62В46» - 0.45 mm.