Any vibration can mean a worn bearing in the water pump o fan clutch. These four kits can rebuild nearly every springengaged fan clutch built after 2001. Viscous fan clutch control override switch archive. Using 11516 wrench, install the horton viscous fan clutch on the engine. 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. During operation, the chamber is filled with varying amount of silicone fluid. Now, i had no way of knowing at the time how much oil is still in the viscous coupling so started by adding 10mls of 10,000wt oil, i used an old oral syringe the wife had for giving the kids calpol, it has 1ml increment markings up to 5ml. The viscous fan drives are offered in either electronically controlled or air sensing via bimetal sensor. They are found on trucks and older rear wheel drive passenger cars.
Fan clutch systems, viscous fan drives, viscous fan clutches multiwing america multiwing, the leading supplier of highperformance axial flow fans, is a single source for fan and fan clutch systems. Jun 22, 2011 visctronic fan drives utilize borgwarners viscous technology with electronic control. I have had in my possession a faulty viscous clutch that i have been meaning to attempt a repair but never got round to it until now. Fan clutch systems, viscous fan drives, viscous fan. Purpose unknown, maybe it prevents a rattle or something. 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. You wouldnt need to completely stop the fan, just apply enough resistance so you can feel if its pulling constantly clutch is fully engaged, as it sounds is the case, if theres a pulse due to the pwm signal commanding the fan to spin at some value less than 100%, or the clutch isnt engaged at all, and youd be able to stop the fan with ease. Never thought id have a problem with engine being too cool. A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when. Visctronic fan drives provide better engine cooling and improved fuel economy with minimum parasitic loss. Below is a description of the electro viscous fan clutch. Acdelco 1522238 gm original equipment air conditioning compressor and clutch assembly. How do i know if my fan clutch needs to be replaced. Wait until fan speed settles and then measure frequency.
Jul 19, 2012 clutch hub in the fan is 20 years old. 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. The viscosity of the fan clutch allows internal friction to occur by moving the molecules against one another thereby causing the fluid to defy flow. Grasp the fan blade tip, and apply fore and aft pressure. It differs from a standard fan clutch simply by the control. Multiwing, the leading supplier of highperformance axial flow fans, is a single source for fan and fan clutch systems. Any visible looseness in the clutch shaft means the bearing is worn. Dont settle for the compromised or unreliable performance you may have experienced with bargain replacements of oem fan clutches and fan products. Kit masters leads the aftermarket in mediumheavy duty viscous fan clutch availability. These systems operate at idle for long periods of time. Years ago i had a 70s vintage toyoto carona viscous fan that leaked. How to test the electroviscous fan clutch gmtnation. Fan clutch, fan drive, electronically controlled viscous fan. How does a vistronic fan clutch work and how do you diagnose one.
Please note the sob clutch is compatible for a selection of norman g. Examination of viscous torque relationships nathan d. The correct way to test a viscous fan clutch is to determine the amount of slippage allowed by the system at the various operating points that the system goes through while warming up. 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. Simply follow the steps below and you rill receive a replacement part number. These fan clutches seem to come with a small blob of silicone sealant on the hook end of that thermostatic coil. Landsharkoz home of the porsche 928 in australia tech. Analytical and experimental characterization of viscous fan clutch. 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. They use viscous couplings to provide additional stability. Vmaster dsr electronically controlled viscous fan clutches. Aug 16, 2014 everytime i hit a little deep water, id say 2. Shaft vibration the fan clutch is mounted on the water pump between the water pump shaft and the fan. 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.
Its like this when cold, its like this after the engine has run a few minutes, and its like this. Manufacturing fan clutches in australia since 1964. Fan clutches for commercial vehicles sachs zf aftermarket. This expands the air in the clutch, and moves the oil in the clutch to the outer edges. Product description fits land rover discovery series i 1994 1999 model vehicles. 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. Two basic viscous coupling systems are used for cv fan clutches. Viscous fan drive test procedure bimetal drives only diagnostic procedure this test is most effective at an ambient air temperature of 80 26. Viscous fan clutch operation symptoms free ase practice. The viscous clutch ensures that the fan speed is automatically adjusted to the level necessary to cool down the engine. Engine overheating with engine hot and ignition off, spin fan 1112 revolutions indicates a worn clutch. Request pdf electronically controlled viscous cooling fan clutch in the vehicle this paper presents on the development of an electronically controlled.
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 fan clutch is a viscous material mixed with a bimetallic sensory system that is comparable to that in a thermostat. Proper fan clutch modulation is crucial for optimized fan speed, as this affects cooling and engine performance. The pattern that should be evident is that on a cold engine the clutch will be engaged at a level in line with the engine temperature at the time of shut down. Oem is ok, but is viscous early technology, is costly, and does not move much air. It is commonly used to link the back wheels to the front wheels so that when one set of wheels starts to slip, torque will be transferred to the other set. The surface area added and the viscous coefficient can be observed and plotted. Viscous fan clutches are belt driven and found on many longitudinal mounted engines. To download a printable identification guide, click here. I think my 04 engine has 12v, 5v, ground, speed signal output to ecm, and a pwm signal from the ecm.
That electric clutch is real expensive cant you just replace it with a regular clutch. This reduces both fan noise and fan power consumption, with the. The viscous coupling is often found in allwheeldrive vehicles. Ris procite, reference manager, endnote, bibtex, medlars, refworks. Due to differences in fan speed and input speed, the silicone fluid is sheared. Center pin visible and allen set screw in a drilled and tapped hole to the right. Electronically controlled viscous cooling fan clutch in.
My fan clutch is pretty much equally stiff all the time time. What links here related changes upload file special pages permanent link page. At 10 inches 254 mm radius from the center, the blade tip should not move more than 116 inch 1. Check the torque of fan drivetopulley, hub and bracket assembly fasteners. As temperatures increase, the clutch engages so that the fan is. The viscous fan clutch provides proper system cooling and prevents compressor clutch slippage or burning, as well as premature compressor failure. All wheel drive viscous clutch awd allwheel drive vehicles are controlled by an electronic control module, vacuum, or viscous fluid. Dodge diesel trucks, as well as most other diesels models, are designed with large cooling system. Thermostatic fan clutch fourbolt type the following are some pictures of a 4bolt style fan clutch sent to kirby palm by greg price. Sachs cv fan clutches or viscous clutches are part of a commercial vehicles engine cooling system and used to cool the engine by regulating the fan speed. It is a thermostatically controlled device that when operating normally will vary the fan speed independently of the engine speed. The amc eagles singlespeed model 119 new process central differential used a viscous coupling filled with a liquid siliconebased material.
Thus, the cv fan clutch is engaged to ensure that sufficient air flows through the radiator. I believe the viscous clutch is ecm controlled based upon a few inputs engine temp, tranny temp, and ac pressure, however tranny temp uses the dodge pcm and the ac pressure sensor is only. It linked the front and rear differentials for quiet and smooth transfer of power to the axle with the greatest traction, on wet or dry pavement. The viscous coefficient, k, is said to relate viscous torque to angular velocity in the following manner. Get rid of the tractor gears in the rear end to slow the engine down.
Note that the type fan clutch shown is used on most xjss and xj12s, but not all. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Note lefthand thread, turn counterclockwise to tighten. The fan clutch will lock up when things get too hot and will sound like a b17 on a takeoff roll. 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. If the fan fails to reach 2125 rpm or higher or 85% of input speed, and the coolant. Viscous couplings are used as the center differential in some fourwheeldrive 4wd vehicles. The fan clutch assembly screws on to a threaded shaft on the accessory belt idler pulley. When i bought my car, some moron did that and it almost caused a catastrophic failure of the plastic fan. The viscous clutches are either electronically controlled or air sensing via bimetal sensor. Refill of viscous fan clutch pictures page 2 peachparts.
The viscous coupling has two sets of plates inside a sealed housing that is filled with a thick fluid, as shown in below. Viscous couplings have a thick fluid contained between a series of plates. A detailed mathematical model of the fan clutch is es. I have searched and read a couple of post regarding this subject but all are different in regards to the oil viscosity, amounts and methods used to attempt repairs. Would you convert my truck to an electric fan and take off my fan clutch. The fan clutch is filled with viscous oil and opening the unit will interfere with the system. This fluids viscosity is measured in cst or centistokes and will wear over time. Apr, 2009 how does a vistronic fan clutch work and how do you diagnose one answered by a verified auto mechanic we use cookies to give you the best possible experience on our website. They also have a thermostatic spring that must be inspected. The point then is that the fan clutch is not only there to drive the engine fan but to do so efficiently. If you still need assistance, contact our customer service team at 800 8109110. And mother mopar did not put them on just to be differentthey work.
Feb 27, 2017 learn what makes a viscous fan clutch operate. Electronically controlled viscous cooling fan clutch in the vehicle. Fan clutch, fan drive, electronically controlled viscous. A good quality clutch can modulate the fan speed with a smooth activation. How does a vistronic fan clutch work and how do you. Dont grab your fan if you suspect it actually works. We exchange information on technical matters, parts sourcing, cars for sale and, when things get slow, argue about whether autos or manuals are better. 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.
Car warmed up and at operation temperature, the fan should put up a better fight. Verify fan engages and frequency is greater than 150 hz 1500 fan rpm. 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. Visctronic fan drives utilize borgwarners viscous technology with electronic control. This is the 4th time and i am sick of this piss poor design. The fan clutch experts at kit masters can help you identify your fan so that you can determine the correct replacement. Excessive fan clutch play push the tip of the fan blade in and out. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. I just put a dual fan set up on my truck, yet it seems to overheat in traffic. Vmaster dsr viscous fan clutches are plugandplay replacements for original equipment fan clutches on vehicles shown on the reverse side. It destroys the clutch fan plus sometimes screws the ac compressor up. Intelligent hightech fan clutches or viscous clutches from sachs reduce the fan speed. Stratis viscous fan drive specifications maximum torque 2,225 in. Optional flangemount design enables the onoff fan clutch to replace traditional viscous fan drives without adding axial length or changing fan location.
They are rated around 5400 cfm that should be enough, can. I was having ovrheating issues and added a mopar viscous fan along with a shroud, new water pump, and recored 3x radiator. As soon as the temp comes down it will gradually drop down to a coast. The fan had stress cracks all over it from being spun up all the time. The fan clutch is an automatic device that is often used in a vehicle s cooling system. Since the fan clutch and water pump have about the same life span, it makes sense to replace both at the same time. Sachs fan clutches for cars and fan clutches for lcv reduce the fan speed by activating. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine. These fan drive systems are ideal for offhighway and stationary equipment, including ag.
The mitsubishi pajero owners club view topic viscous. Viscous fan clutch and fan replacement products for. Its innovative reservoir, actuator and valve system deliver faster response time and lower offspeed for maximum efficiency. Intelligent fan clutches for cars and lcv sachs zf aftermarket. One set of plates is attached to one axle, and the other set is attached to. 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. In the case of mine the viscous hub separated into to parts. Check the unit for leaks through the seams and around the shaft. 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. Verify frequency is between 10 and hz indicates 1000 fan rpm. This paper presents on the development of an electronically controlled viscous cooling fan clutch actuator. Landshark is an australianbased website dedicated to the porsche 928 and all its variants. 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.
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 search by part number below to find a replacement for your fan clutch. From daviescraig these are the most common symptoms of a failed fan clutch. Fan clutch program for trucks ec fan engagement high. Article information, pdf download for analytical and experimental characterization. The fan drive is controlled by the engines control module for precise fan speed modulation. Attached fan to horton viscous fan drive using fasteners included in package. Schiffrik physics department, the college of wooster, wooster, ohio 44691 april 29, 1998 viscous torque, the resistance that a fluid offers to rotational motion, was studied with air on a polished metallic sphere.
880 1097 1326 193 187 1236 838 375 287 878 636 1015 1288 961 723 1112 142 1238 979 685 812 947 188 111 1442 1175 1351 3 672 1416 280 258 503 973 1541 639 1054 1183 1080 276 686 982