What is a viscous fan drive?
Viscous drives control how fast an engine fan spins with remarkable accuracy. Oil is released from a reservoir into grooves that allow for increased or decreased friction depending how much cooling is needed.
How does a viscous fan drive work?
How Does a Viscous Fan Drive Work? In a viscous drive, the main shaft turns at RPM proportional to the engine speed, while the drive housing attached to the engine fan maintains a separate speed, set by the electronic engine control module. In other words: The fan clutch speed is independent from the engine’s RPM.
Should a viscous fan spin all the time?
Yes, it will spin all the time regardless, when the engine is running, but it should be easy to observe that it spins slower engine cold than engine hot.
Can a faulty viscous fan cause overheating?
Decrease in power, acceleration, and fuel efficiency A faulty fan clutch that leaves the fan permanently engaged will not only cause a noisy engine, but can also cause a decrease in performance. When it fails, the engine can be put at risk of serious damage due to overheating.
How to do a viscous fan drive test?
www.ets.borgwarner.com Subject: Viscous Fan Drive Test Procedure (Bi-Metal Drives Only) Diagnostic Procedure This test is most effective at an ambient air temperature of 80° (26.7°C) or higher. 1. Check the torque of fan blade fasteners. Refer to Table 2, Torque Chart. 2. Check the torque of fan drive-to-pulley, hub and bracket assembly fasteners.
When do you need a viscous fan coupling?
Viscous fan couplings are used on vehicles (cars and trucks) with inline engine positions, mainly rear wheel drives. These fans are needed at slow speeds and while idling. A faulty fan can cause an engine to overheat while idling or in heavy traffic, or poor mileage and loss of horse power.
Do you need a part number for a viscous fan clutch?
If you are unable to find a part number on your viscous fan clutch, our easy-to-use fan clutch identification system will walk you through the process of measuring it to determine the proper replacement. Our one-of-a-kind modular system eliminates the need for excessive viscous fan clutch inventory.
What kind of fan clutch does Kit masters use?
Kit Masters leads the aftermarket in medium/heavy duty viscous fan clutch availability. By offering both genuine BorgWarner ® parts and our line of Spectrum Modular Viscous Fan Clutches, we cover the medium/heavy duty viscous fan clutch market better than anyone in the industry.
www.ets.borgwarner.com Subject: Viscous Fan Drive Test Procedure (Bi-Metal Drives Only) Diagnostic Procedure This test is most effective at an ambient air temperature of 80° (26.7°C) or higher. 1. Check the torque of fan blade fasteners. Refer to Table 2, Torque Chart. 2. Check the torque of fan drive-to-pulley, hub and bracket assembly fasteners.
Viscous fan couplings are used on vehicles (cars and trucks) with inline engine positions, mainly rear wheel drives. These fans are needed at slow speeds and while idling. A faulty fan can cause an engine to overheat while idling or in heavy traffic, or poor mileage and loss of horse power.
If you are unable to find a part number on your viscous fan clutch, our easy-to-use fan clutch identification system will walk you through the process of measuring it to determine the proper replacement. Our one-of-a-kind modular system eliminates the need for excessive viscous fan clutch inventory.
Is the fan drive the same as the fan clutch?
The two terms “fan clutch” and “fan drive” are interchangeable. Although the fan clutch is driven by the engine, it is designed to stay “idle” in off mode and to turn on (with the engine as the primary force) as the engine temperature increases.