A detailed mathematical model of the fan clutch is established by taking into account the viscosity variation of the viscous fluid with shear radius and temperature, and an iterative algorithm is. One of the four suggested steps to test a viscous fan clutch was the rolled up newspaper test. Viscous magnetic clutch for a radiator cooling fan which is electrically energized on closure of thermoswitch mounted within coolant of engine radiator. Check the fan drive, fan blade assembly, shroud, radiator, and the immediately. Engine overheating with engine hot and ignition off, spin fan 1112 revolutions indicates a worn clutch.
Vmaster dsr viscous fan clutches are plugandplay replacements for original equipment fan clutches on vehicles shown on the reverse side. Below is a description of the electro viscous fan clutch. The 2speed fan clutch delivers crucial cfm to the engine compartment, keeping a more consistent engine temperature with fewer full fan clutch engagements. Since the fan clutch and water pump have about the same life span, it makes sense to replace both at the same time. Viscous couplings are used as the center differential in some fourwheeldrive 4wd vehicles. Multiwing, the leading supplier of highperformance axial flow fans, is a single source for fan and fan clutch systems. In order to ensure proper fit, verify that the vmaster dsr part number is an exact cross reference match to the oem fan clutch or fan clutch assembly part number. Fan clutches reduce the drain of engine power and improve the efficiency of a vehicles cooling system. Engine cooling fan with viscous magnetic clutch which is electrically energized on closure of thermal switch mounted within engine coolant. The compact fan clutch design provides the highest possible torque in a small package.
Clutches free delivery possible on eligible purchases. Optional flangemount design enables the onoff fan clutch to replace traditional viscous fan drives without adding axial length or changing fan location. Jun 23, 2017 this is how i adjust the engage temperature of a kit masters viscous fan clutch. It was a much harder and more frustrating job with the fan and shroud in place. Shaft vibration the fan clutch is mounted on the water pump between the water pump shaft and the fan. The clutches are on only when required, so up to 20 horsepower is not needlessly wasted turning the fan. The fan clutch is an automatic device that is often used in a vehicle s cooling system. For best results, check and replace any worn belts. Refill of viscous fan clutch pictures page 2 peachparts. If the fan fails to reach 2125 rpm or higher or 85% of input speed, and the coolant. Viscous fan couplings also known as viscous fans or viscous fan clutches in the aftermarket are one of the lesser known products of the engine cooling system despite being part of more than 960,000 vehicles in the uk.
If the fan fails to reach 2125 rpm or higher or85% of input speed at 200220f 93. Fits m939a2, m923a2, m925a2, m927a2, m929a2, m930a2, m931a2 5ton trucks. Viscous fan clutch operation symptoms free ase practice. Hi, i my viscous fan clutch acts normally, but its. The fan clutch is just what the name says, it is a mechanism that will clutch the fan on and off depending on the need for more or less cooling air to flow thru the radiator. 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. How do i know if my fan clutch needs to be replaced. Based on the verified model and calculation algorithm and the experimental setup, the performances of six alternative viscous fan clutch designs are studied. The point then is that the fan clutch is not only there to drive the engine fan but to do so efficiently.
If your fan is roaring like a jet engine after it has warmed up, do not test. Fan clutches are fluid coupling devices which provide air flow through the radiator by using the water pump shaft to power a fan blade. They are found on trucks and older rear wheel drive passenger cars. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. The fan had stress cracks all over it from being spun up all the time. Check the torque of pulley, hub and bracket assemblytoengine fasteners. Pdf 38mh428m mack fan clutch wiring diagram foon tage. As fan coil housing is driven on engagement of the magnetic clutch, silicone fluid is centrifugally displaced into working area of viscous clutch for fluid drive of fan body. Viscous fan clutches are belt driven and found on many longitudinal mounted engines.
When the engine is hot and off after a good long run the fan spins freely, no resistance at all does this sound like a fan that has failed or am i assessing it incorrectly. I started having heat problems in colombia and refilled my blue viscous fan clutch with 50ml of about 8000cst silicone oil from an rc shop. The first massproduced viscous couplings for a permanent 4wd offroadcapable vehicle was in the amc eagle, which was produced from 1980 to 1988 model years. Fan clutch test first, lets discuss what the fan clutch does and why it is there. Using 11516 wrench, install the horton viscous fan clutch on the engine.
Understanding the role of viscous fan couplings in engine. Analytical and experimental characterization of viscous fan. Visctronic 12 volt 732842882 fan drives borgwarner. The test states that if the fan cannot be stopped easily that is a good indication the clutch is ok. Unique clutch designs makes installation quick and easy. By offering both genuine borgwarner parts and our line of spectrum modular viscous fan clutches, we cover the mediumheavy duty viscous fan clutch market better than anyone in the industry. Fan clutch, fan drive, electronically controlled viscous fan. With more than 60 years of industry experience, commitment to service, reliability and innovation, horton is a premium worldwide provider of cooling solutions for engines. Any vibration can mean a worn bearing in the water pump o fan clutch. A fully disengaged fan clutch means improved fuel economy, quicker engine warmup, increased engine performance and reduced fan noise. Wait until fan speed settles and then measure frequency. Any visible looseness in the clutch shaft means the bearing is worn. Improvement in energy efficiency has been achieved by automation of the engine control.
Stratis viscous fan drive specifications maximum torque 2,225 in. Fluid inside of the coupling heats up as the engine temperature rises, causing the fan hub to grip more, and engage the fan. Under correct operation when the engine is cold, the fan will spin but not very hard. Electronically controlled viscous cooling fan clutch in. Fan speed should be at least 85% of pulley speed after engagement d. How does a vistronic fan clutch work and how do you.
Adjusting temperature on viscous fan clutch youtube. Efficient warner 12vdc fan drives are easily controlled using sensors and onboard controls unlike viscous fan drives, which go from. Laboratory experiments are then carried out on a performance measurement setup for viscous clutch, for validating the proposed mathematical model and calculation method. I just put a dual fan set up on my truck, yet it seems to overheat in traffic. Engine cooling fan with viscousmagnetic clutch which is electrically energized on closure of thermal switch mounted within engine coolant. I know the shop manual specifies removal of the viscous fan, but its entirely possible to remove and repace the radiator without removing the fan. Electronicviscous fan clutch troubleshooting during engine start up, the ev fan clutch will engage and match engine speed for up to 3 minutes. Electronically controlled cooling fan clutch for cv.
Bg automotive provides a great opportunity to tap into this undercapitalised segment. The clutch plate serves as a fluid pump to feed the viscous sheer area of the clutch so that conventional pump plate construction is eliminated. How to test the electroviscous fan clutch gmtnation. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine. Excessive fan clutch play push the tip of the fan blade in and out. Analytical and experimental characterization of viscous. The fan clutch is a component of the cooling system that varies the fan speed to meet the cooling needs of the. These four kits can rebuild nearly every springengaged fan clutch built after 2001. Cooling fanclutch, for m939a2 series 5ton trucks equipped with cummins 6cta, 8. Its like this when cold, its like this after the engine has run a few minutes, and its like this. This viscous fan clutch has been manufactured using the same process as that used in the manufacture of original equipment parts.
Dont settle for the compromised or unreliable performance you may have experienced with bargain replacements of oem fan clutches and fan products. Removal and reinstallation of viscous coupled fan, serpentine belt replacement there is very limited access to the bolt holding the viscous fan to the water pump pulley. This version is used on passenger cars and small to mediumsized commercial vehicles. This paper presents on the development of an electronically controlled viscous cooling fan clutch actuator. Oct 25, 20 one of the four suggested steps to test a viscous fan clutch was the rolled up newspaper test. Verify fan engages and frequency is greater than 150 hz 1500 fan rpm.
Feb 27, 2017 learn what makes a viscous fan clutch operate. They are rated around 5400 cfm that should be enough, can. Because of slippage in the fluid drive, fan speeds will gradually increase from. As temperatures increase, the clutch engages so that the fan is. Mar 30, 2016 viscous fan couplings also known as viscous fans or viscous fan clutches in the aftermarket are one of the lesser known products of the engine cooling system despite being part of more than 960,000 vehicles in the uk. The viscous fan clutch, which is effective in large vehicles such as commercial trucks, was introduced 50 years ago to reduce fan power and the noise level. Understanding the role of viscous fan couplings in engine cooling. The fan had stress cracks all over it from being spun up all. The viscous clutches are either electronically controlled or air sensing via bimetal sensor. Request pdf electronically controlled viscous cooling fan clutch in the vehicle this paper presents on the development of an electronically controlled. The fan clutch operates in accordance with the airflow temperature behind the radiator.
Testing a viscous fan defender forum lr4x4 the land. Fan clutch, fan drive, electronically controlled viscous. That electric clutch is real expensive cant you just replace it with a regular clutch. If the ev fan clutch has a condition that warrants replacement, a d tc diagnostic trouble code should set andor sl diagnostics should lead to the replacement of the fan. Viscous couplings for scania truck for sale, viscous fan.
When i put the oil lines back on, add the fluids and start it up, i give the ac system a 5050 shot of working because it was very much in the way because i didnt take off the viscous fan. The fan clutch experts at kit masters can help you identify your fan so that you can determine the correct replacement. After i rebuild the viscous fan clutch it got better, but about 1 month later in ecuador the car already cooked 3x when going uphill at. If you still need assistance, contact our customer service team at 800 8109110. The front electric fans come off, then the radiator comes out fairly easily with the viscous fan in place.
My fan clutch is pretty much equally stiff all the time time. Note lefthand thread, turn counterclockwise to tighten. Verify frequency is between 10 and hz indicates 1000 fan rpm. Electronically controlled viscous cooling fan clutch in the vehicle. This is how i adjust the engage temperature of a kit masters viscous fan clutch. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. From daviescraig these are the most common symptoms of a failed fan clutch. Viscous fan clutch and fan replacement products for. The temperature on the outgoing air from the radiator is used to control the fan. Vmaster dsr electronically controlled viscous fan clutches.
Kit masters leads the aftermarket in mediumheavy duty viscous fan clutch availability. So, when the engine is cool or even when it is at a normal operating temperature, the fan clutch will partially disengage the engine s radiator cooling fan which is mechanically driven. The standard clutch uses a thermostat on the front side to rotate a small shaft which increases the fan speed depending on the heat coming from the radiator. In some models removal of the radiator will be required to access the bolt clearance is very limited and large hands are a hindrance. After i rebuild the viscous fan clutch it got better, but about 1 month later in ecuador the car already cooked 3x when going uphill at very cool air temperatures 1015celcius.
A torque limited fan clutchdrive is based on the principle of torque transmitter wherein. Us4227861a cooling fan with viscousmagnetic fan clutch. It differs from a standard fan clutch simply by the control. Check the torque of fan drivetopulley, hub and bracket assembly fasteners. Due to differences in fan speed and input speed, the silicone fluid is sheared. Now, you can buy viscous fan clutch and fan replacement parts for all makes of vehicles from horton, the leading global provider of rugged, reliable, oem engineered fan drive systems.
Do not replace an ev fan clutch unless a specific condition related to the ev fan clutch is identified using sl diagnostics. Its already confirmed that the clutch is locked up and needs to be replaced. You dont have to remove the fan, you really want to. Viscous fan drive test procedure bimetal drives only diagnostic procedure this test is most effective at an ambient air temperature of 80 26. The fan hub is a mechanical coupling that operates based on the ambient temperature. Would you convert my truck to an electric fan and take off my fan clutch. Viscous coupling for scania truck sale advertisement from russia. When i bought my car, some moron did that and it almost caused a catastrophic failure of the plastic fan. This one was from a t444e school bus but its similar for many vehicles including dt466, cummins etc.
Electronically controlled viscous cooling fan clutch in the. Borg warner troubleshooting vehicles equipped with viscous fan. Simply follow the steps below and you rill receive a replacement part number. Check fan for any damage and clean radiator prior to installation. Attached fan to horton viscous fan drive using fasteners included in package. A drain hole within the clutch plate is controlled by magnetically operated valve mechanism on. By stiff, i mean you can turn it by hand, but you cant spin it, in any direction, for more than 110 of a turn or so. In a nutshell the viscous fan clutch is made up of two halves mated to each other and capable of rotating semiindependently of each other. Fan clutch should engage at approximately 190195 degrees f. Im not really bothered about fitting a leccy fan and have read all the threads on that, so no need to go over that again.
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