Do-it-yourself viscous coupling repair freelander

After analyzing the comments of motorists on forums and social networks, it became obvious that drivers have a very abstract idea of ​​such a simple and interesting in many respects device - viscous coupling. So, read the details about the principle of operation, checking and self-repairing the viscous coupling.

Viscous coupling — it is a special device that rotates the cooling fan thanks to a special fluid. It has a round shape with a silicone base filled with grease; serves for smooth fan control. At first glance, the principle of operation will seem complicated, however, if you look at it, this is not so: the crankshaft rotates, transferring energy to the first shaft of the clutch. The device then accelerates, which makes the silicone inside it more viscous. The clutch is blocked, after which the second disc begins to rotate, on which the radiator fan is located.

The viscous coupling is used on almost all motors, since the device is reliable and safe. If a hand is inserted into a moving mechanism through carelessness or inexperience, the device will stop, thus preventing injury.

After a long period of inactivity of the car, the viscous coupling needs an oil change, as well as a check of the condition and operation in general. In addition, failure is possible due to wear or some other reason.

It is quite difficult to recognize a breakdown of a viscous coupling, but there are ways to check its performance.

Look at the speed of the device when the engine is cold and hot. In the first case, strange sounds are usually not observed, and the number of revolutions is correct. With a hot engine, the picture is different: extraneous noises are heard, and the rotational speed of the viscous coupling may not correspond to the norm.

Various noises are often caused by faulty bearings. Also, the cause of the device malfunction may be the gland seal, or the leaked special silicone fluid.

If you notice engine overheating, do not rush to do replacement viscous couplings. You may be able to repair the broken part yourself.

• The most common cause of failure is silicone leakage from the base of the part. To fill in new fluid, you need:

1. Remove the viscous coupling from the water sediment, and then disassemble it.
2. On the disk of the device itself there is a plate with a spring, under which there is a hole for the silicone fluid. You need to use the utmost care to remove the pin, and then fill with a syringe with grease. Keep in mind that during such a repair, the part is laid horizontally.
3. It is enough to draw fifteen milliliters of oily liquid with a syringe.
4. Slowly pour the silicone inside.
5. Wait a few minutes without removing the syringe from the hole, so that the liquid has time to deeply flow into the viscous coupling.
6. Wipe the surface of the device from excess liquid if necessary.
7. Replace the pin and then install the part.

If you are not well versed in cars and do not know how certain parts work, it is better not to start repairing yourself. The point here is not the possible breakdown of parts of the vehicle, but the difficulty of putting everything back together.

• Also, bearings are a common cause of viscous coupling failure. There is only one symptom of such a malfunction: various kinds of noises in the area of ​​the cooling radiator.

1. To repair the device, the first step is to remove it. To do this, unscrew the three bolts that secure the part. After that, the viscous coupling can be easily removed from the engine compartment.
2. After removing the device, you can start replacing the bearing. Replace them only when you have disassembled the unit and drained the oil fluid. Use a special tool to remove the bearing - a puller. If you use the tools at hand, you can completely damage the node.
3. Having installed a new bearing, you can start installing the device. Do not forget to fill in new silicone fluid, which was drained before repairing the viscous coupling.

When you notice a "misbehaving" of a coupling, you do not need to change the entire part right away, as it can often be repaired. Special skills and abilities for this business will not be required.

The only difficulty that can arise is finding a puller to remove the old bearing. The tool is not sold in every car store, which makes it difficult to repair the viscous coupling on your own. If you have visited all the car dealerships you know and did not find a puller, ask your friends-drivers. The rest of the details are easy to find.

• Not all such devices have a hole for filling oily liquid. If you are a "beginner", do not try to repair the device yourself. Experienced craftsmen make the holes themselves. You can, of course, also try drilling the hole at your own risk.
• Do not use brute force when handling the disc. If the aluminum on the currency is bent, the viscous coupling cannot be repaired - only a complete replacement of the device.

1. Open the hood of the car and flip out some of the fan housing latches.
2. Unscrew the bolts with a 6-point hex wrench.
3. Remove the cooling fan.
4. Rotate the cover 180 ° to the right. There is no other way to remove the part. Therefore, it will not work to get to the viscous coupling.
5. Unscrew the viscous coupling with a 36 wrench. The tool jaws should be no thicker than 10 millimeters.
6. After taking out the device, clean it from dirt and dust.
7. Next, you need to rivet the bimetallic plate of the viscous coupling on one side.
8. Pull out the part disk and fill with a syringe with PMS-100 lubricating fluid.
9. Assemble the viscous coupling structure back; install the device in the car.

1. There are no fundamental differences in removing the device. You need to unscrew three screws securing the impeller and then three more to remove the cover.
2. Then, taking out the viscous coupling, carefully remove the upper disc, which serves to block the fan.
   
3. The entire device is lubricated with special oil. Repair the viscous coupling to preserve it. If you do not know the exact name of the liquid, it will be extremely difficult to find it.
4. Simply replacing the bearing will not work, since you first need to grind off the flare on the shaft.
5. Place the device in a vise for greater ease of repair.
6. The bearing also needs to be ground off. If this is not done, the base of the viscous coupling can be severely damaged.
7. Buy a sealed type bearing with no visible balls at any automotive store. Its cost is not more than 100 rubles.
8. Before seating the bearing, coat the seat with sealant.
9. Assemble the viscous coupling and then install it in the car.

Found on one of the forums. in my opinion, an excellent and detailed instruction for the restoration of viscous coupling.
Author.VladPe
1. We start repairing a jammed clutch by removing it from the car, how to do this is in all repair manuals.

3. We drill two holes, as shown in the photo, symmetrically to each other

4. I cut an m6 thread in the holes, see what comes out of the hole when blowing with air

5. Next, I assembled the flushing unit. I used solvent 646 for flushing, it is better to use gasoline

6. During the recirculation of the flushing fluid, it is necessary to twist the internal splines, at first this happens with great effort, then easily

7. After flushing, it is necessary to blow the coupling well with air to remove the solvent residues, while continuing to rotate by the internal splines

8. Into the washed and purged sleeve, into one of the screwdrivers we twist the oiler, through which we pump the PMS 10000 liquid with a syringe.
pump in until the PMS 10000 comes out of the other hole.

• Vadim61
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From tyrnet - In my experience, after pouring PMS 10000, I performed an experiment - I hung one front wheel under the remaining three, put shoes on, turned on the scrubbing, the suspended wheel lazily rushed into idle, when gas was added, the revolutions were about 1500-2000 (2.5 diesel) the suspended wheel slightly accelerated, but the car practically got out of the shoes, i.e. the clutch performed its function.
From my experience - If he skidded specifically on the car for about 15 minutes .. like me in shit .. I would be very surprised at what he saw - the clutch stopped transmitting torque. For a car that sometimes goes on a fishing trip or to the dacha .. better than only 20,000 and no less. IMHO

A PHOTO of the disassembled, sawn, viscous, on page No. 3 of this topic .. post No. 22

Since failures occur, many owners will be interested in learning how to repair a viscous fan coupling with their own hands. Many car owners with such a device advise not to rush to throw it away, but try to repair it yourself. According to many of them, this is not difficult to do.

To begin with, it is advisable to get acquainted with its device and the principle of operation, and only then proceed with the repair work. The reasons for which they begin to pay attention to the viscous coupling are usually the engine overheating during normal operation of the thermostat and other elements of the cooling system.

Do-it-yourself fan viscous coupling repair often it is necessary to perform after a long idle time of the engine, its long-term operation, as well as for some other reasons. Its installation on an internal combustion engine has one goal, it is a smooth increase in fan speed as the engine warms up. With an increase in the operating temperature of the coolant, the fan speed should increase.

A viscous coupling is a device, the principle of operation of which is the possibility of transmitting rotational motion by means of a special fluid that is pumped into it. It can be thought of as a small circular chamber filled with silicone-based grease. There are two shafts inside this chamber, and the principle of operation is as follows. The crankshaft makes a rotating motion, which is transmitted to the first shaft of the clutch. With increasing loads on the disc, its rotation speed becomes higher, this leads to an increase in the viscosity of the silicone inside the coupling.

The clutch is blocked, which leads to the rotation of the second disc, on the shaft of which the radiator cooling fan is mounted. Another principle for turning on this device is the temperature properties of the injected silicone grease. These properties are used to turn on the cooling fan when the motor temperature rises. With an increase in temperature, it is turned on, and when it is lowered, it is turned off.

The widespread use of the clutch on modern motors is due to its high reliability and safety. In case of careless handling of it, when the hand enters the rotation zone, it stops without damaging the hand.

There are very few such signs, but they exist, let's try to understand them. Most manuals for the operation and repair of cars advise you to check how the fan rotates when the engine is cold and hot. It is also stated there that on a cold engine, no special changes in the rotational speed are noticed during gas overload, but on a hot engine, on the contrary, it increases.

It is necessary to check the longitudinal play of the fan of the clutch, if any, it requires treatment.The appearance of extraneous noise during rotation may indicate a failure of the bearings. Faults also include aging of the packing glands. However, the most common type of malfunction is leakage of silicone fluid from the coupling housing.

Since fluid leaks from the clutch most often, let's talk about it first. To replenish it, you need to remove the viscous coupling from the water pump, and then proceed to disassemble it. On the removed device, under the spring plate, there is a filler hole for the working fluid. On the removed coupling, the pin is carefully pulled out and the missing amount of liquid is injected with a syringe. Most often, it is recommended to pour transmission oil into the clutch.

When refilling fluid, place the sleeve horizontally with the hole facing up. Approximately 10-15 ml is drawn into the syringe. liters of transmission oil and without a needle insert it into the filler hole. Squeeze out the liquid and wait for some time without removing the syringe from the hole. After that, wipe off excess oil from the surface of the clutch housing and put the pin in its place. The product is ready for further use.

The signal for such an operation is the noise in the area of ​​the radiator cooling fan. To repair it, the viscous coupling must be removed from the car. In most cars, it is mounted on a water pump pulley. This ensures reliable thermal contact with the coolant. It is necessary to unscrew the three bolts of its fastening, and it easily comes up from the engine compartment.

After that, you can start replacing the bearing. This operation can be performed only after complete disassembly of the unit and draining the liquid. In the future, it will be replaced with fresh one. The bearing must be removed only with a puller, otherwise the entire assembly may be damaged. After installing a new bearing, it is collected and filled with fluid.

Whatever happens, do not rush to throw away the old node and buy a new one, if it has not scattered at all. Do-it-yourself fan viscous coupling repair is an affordable operation that does not require special knowledge and tools. A bearing puller can be found from colleagues in the garage cooperative, the rest is not in short supply today.

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