How does a viscous hub work

It is good practice to always check the condition of the viscous fan coupling when the water pump is replaced. This can cause disruption with high noise and vibration, making a loud whirling sound as the engine is revved and will increase fuel consumption. On the other hand, if the viscous fan coupling fails in the disengaged position, it will not draw air through the radiator. This in turn will lead to the engine overheating as the cooling process is disrupted.

Leaking silicone fluid, disengaging the fan coupling. The bimetal sensor governs the functioning of the viscous fan coupling. Primarily, there are two kinds of bimetal sensor systems: plate and coil.

Both of them work under the same principle, as explained previously. The only difference is that whilst the coil expands and contracts to turn the rotation plate, the bimetal contracts and bends. This moves the slide plate and allows the silicone fluid to move from the reservoir chamber to the cavity.

BGA viscous fan couplings are fully tested before release to the aftermarket to ensure high quality of the replacement products. The process involves testing the engagement and disengagement temperatures of the product; whilst comparing the data against an OE part to warrant correct performance. Being a high-value ticket item at OE level, dealers service only a very limited business while the aftermarket for this product is shared between suppliers.

Although these suppliers have gained a small foothold within the market, none of them offers a full range. Factors, therefore, need to multi-source parts to support the varied UK car parc, which is neither practical nor cost effective. Aftermarket specialist BGA have the most comprehensive range of viscous fan couplings, consisting of 60 references. Lukewarm air, burning smell, overheating while idling- are the symptoms of a bad clutch fan. How do I know when my water pump is bad?

Here are some common symptoms that hint towards having a bad water pump: Coolant leak at the front-center of your car. Water pump pulley is loose and making whining sounds. Engine is overheating. Steam coming from your radiator. How does a hydraulic cooling fan work? The hydraulic fan drive creates airflow through the engine-cooling radiator and the charge air cooler. A hydraulic fan motor directly drives the engine Modulated fan speed will depend on the amount of oil flowing through the fan motor.

The oil flow is measured in gallons per GPM minute. How do clutches work? In order for a car to stop without killing the engine, the wheels need to be disconnected from the engine somehow. The clutch allows us to smoothly engage a spinning engine to a non-spinning transmission by controlling the slippage between them. A clutch works because of friction between a clutch plate and a flywheel. How does a non thermal fan clutch work?

Non-thermal clutches operate solely based on the shaft speed of the water pump. At low and idling speeds, the clutch allows the fan blade to turn at almost a ratio. A non-thermal clutch provides a steady flow of cooling air but is always engaged, so it offers lower fuel savings than a thermal-style fan clutch. When an engine can devote less energy to cooling and more to turning wheels, that means fuel savings.

Once that happens, the fan slows way down, consuming less fuel. Farmers, construction workers and miners all use diesel fuel to get their job done. That means a more comfortable experience for an operator. Engine fans are one of the largest sources of noise on a vehicle, so increasing noise emissions rules are a large driver for adoption of viscous cooling technology in Europe. Every time an internal combustion engine runs, particulate matter is created as a biproduct of the engine cycle.

But proper cooling can limit it and thus significantly decrease carbon emissions. Some long-haul applications see their drive disengaged up to 90 percent of the time, so they still benefit from an on-off drive. These fans are needed at slow speeds, typically below 35 mph and at idle.

They can cause a vehicle to overheat at idle and in heavy traffic. The fluid wears, rendering it incapable of grabbing the drive and driven plates and offer the gripping resistance needed to hold them together.

If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower.