Clutch Visco Fan

Viscous drives control how fast an engine fan spins with remarkable accuracy.

Whole house fan for window. At idle and low engine speeds this fan clutch is fully engaged gradually disengaging as engine speed increases. Radial streaks are another potential cluethis happens when oil escapes from the clutch and is then blown outward in all directions by the fan. A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed allowing the engine to warm up faster relieving unnecessary load on the engine.

They can cause a vehicle to overheat at idle and in heavy traffic. A viscous fan clutch can cool a truck tractor construction machine power generator or mine haulers engine with a similar amount of flexibility. These fans are needed at slow speeds typically below 35 mph and at idle.

As temperatures increase the clutch engages so that the fan is driven by engine power and moves air to cool the engine. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Viscous fan clutch operation symptoms.

Learn what makes a viscous fan clutch operate. The oil flows to and from the main chamber as engine heat fluctuates engaging and disengaging the clutch. When starting engine cold start fan will initially start at higher speed until oil has flown back from working chamber 16 into reservoir 15 approx.

Depending on the application it may freewheel above 2500 to 3000 rpm. Triumph spitfire water pump cooling fan and belt late 1500 viscous type. Detailed animations show internal components.

How to test a fan clutch 11 s with pictures wikihow. Inside the fan clutch there is a small reservoir filled with a viscous silicone based oil. A centrifugal valve opens to allow the flow of heavy silicone fluid locking the fan blades to the pulley.

Ue46114 rolls royce fan clutch with a m24 lh thread the ue46114 rolls royce fan clutch is a durable and reliable air sensing viscous fan hub. The visco fan clutch is a service free hydraulic clutch which operates independent of temperature and free of steps. A torque limiting fan clutch reacts to engine speed.