The UMZ-421 engine has a rich history. There are several modifications to this device. They are actively installed on UAZ series cars. Amplifiers are used in them a vacuum type. According to experts, the devices are distinguished by a high step. In this case, the tensioners are able to withstand heavy loads. To understand the engine in detail, it is recommended to consider its performance.
General device parameters
Model 421 (engine) specifications has the following: four cylinders, ring diameter 100 mm. The compression ratio is located at 8.2. At a frequency of 4000 revolutions, the device produces a power of 82.4 kW. The maximum torque is 221 ks per meter. The maximum speed reaches 2500 per minute. The specific fuel consumption depends on the type of modification.
Engine device
Model 421 (engine) includes a cylinder block, a carburetor, and a pump. Additionally, a damper device is used. The drive is matched with a fan. At the bottom of the modification there is a fitting. Additionally, it is worth noting that the model has a check valve. The motor shaft is used with a diameter of 2.4 cm. The connecting channel is connected to the hose. The locking unit is located at the top of the device. Under the carburetor is a filter. The tensioner in the modification is used with a tank.
Oil filling mechanism
The oil filling mechanism on model 421 (engine) is installed in the side of the device. The recirculation valve is designed for high pressure. Exhaust fumes exit through the hole. A pad is used to avoid block wear. The lower pulley in the device is protected from gases. There is a hose to drain used oil. The filter in this case is absent.
Fitting department
The engine fitting is located under the central drive. It has two shafts that are connected through a disk. The valve in the device applies low pressure. The outlet pipe is under the carburetor. For a partition a rack is used. If we consider the UAZ-421 engine, then it has a crankcase with a hose. There are three filters in the mechanism.
The tank is fixed using clamps. If we consider the lower part of the modification, there are small holes. The upper pulley in the device is fixed under the clamp. The engine mount has a lining. If you look at the top of the device, there is an air filter. Underneath is a block for the connector. A pulley for 421 engine (Gazelle) is installed under the tank. It should also be noted that the model has supply hoses, which are necessary for cooling the system.
Engine starter
The starter for the UMZ-421 engine is installed with a closing mechanism. In total, he has three blocks. Experts say that the model is able to work at reduced speeds. A contactor is used to close the circuit. Three conductors are connected to the starter of the device.
Device radiator
The radiator in the model is connected to the starter. The connector on model 421 (motor) is placed under the unit. The pulley in this case is applied at 3 mm. One hose leaves the expander. If we consider the upper part, we must mention the presence of wire channels for the removal of gases. There are also special locks that are mounted on nuts. In order to disconnect them, the keys are used. In this case, the shaft must be well fixed. After disconnecting the pump, it will be possible to inspect the starter.
Modification 421.10
The specified modification 421 (engine) characteristics have the following: maximum torque of 221 ks per meter, the average speed reaches 2500 per minute. A model with an extended pin is produced. She has a carburetor with a drive. Directly valve is used with tensioner.
It should also be noted that the device stands out with a wide output. Considering the UAZ-421 engine, you can see that it has a tensioner used with a tube. Channels are made with overlays. Modified starter deserves special attention in the modification. The filter is located in front of the damper. If we talk about the shortcomings, it should be noted that hoses from the carburetor often fly out. Additionally, problems with the connector may lie in wait. In this case, it is fixed under the drive. The fan of the model is able to operate at high speeds for a long time.
Engine 4215.10
The presented modification 421 (engine) is made with a ventilation crankcase. The drive is used on two outputs. If we talk about the benefits of modification, it is important to note that it can withstand large overloads. The oil pump is used in high quality, and the drain pipe is rarely contaminated. Also, experts indicate good channel conductivity. Deposits on them are very rarely observed. A carburetor is standardly used with a stand. It is also worth saying that the connector is installed at the bottom of the engine.
Engine Modification 4218.10
Presented engine 421 (injector) is made with durable seals. Cylinders in this case are on the sides. If we consider the advantages of the model, then long channels deserve attention. The oil block in the device is well protected. Experts point to the wide neck of the modification. The radiator is used with additional racks. The air filter is fixed near the rack. In total, the model has three pulleys.
It should also be noted that the fan is able to maintain high speed. The pump is used with a connector. The tensioner is installed in the lower part of the engine next to the lever. The drive is fixed to the nut. In order to repair the device, you will first have to remove the radiator. After that, it remains only to fix the upper pulley and turn the bolt clockwise. The expander from the engine is removed using a key. The overlay on the cover is selected a small thickness.
Starter Repair
The starter for this modification fails, as a rule, due to disconnected contacts. In order to check them, the connector block is removed using a key. The next step is to inspect the surface of the tank. If oil leaks are visible on it, a broken hose must be detected. Also, the problem may be the shift of the tank. In this case, the pipe closes.
The approach is inspected last. To disconnect the starter, you must prepare a Phillips screwdriver. The fitting in this case does not need to be touched. You can use a screwdriver to unscrew the hoses. The first starter mount is located near the expander. In this case, do not touch hoses. After removing the bolts, it remains only to remove the starter. This can be done independently without the help of others. To check the operation of the contactor, the protective cover is unscrewed. If the clamping plates are loose on the wires, they must be squeezed. You can do this manually.
Replacing the trim on the connector
Replacing the pad on the connector is quite simple. If leaks occur, first flush the engine. After that, it is important to make sure that the problem lies in the connector. Further, in order to repair 421 engines, it is necessary to proceed directly to the inspection of the part. To do this, you will have to twist the upper pulley. The next step is inspected the tank of the device. The cover of the model is removed using a key.
The engine screws are on the sides. It should be noted that the lid must be lifted very carefully. At the same time, the overlay should not fall to the filter. It should also be noted that you will have to hold the tank. The pad should be clean and flexible. If darkening is visible, then it will have to be replaced. After the operation, the lid is put in its original place. Fasteners are wound up gradually. In this case, it is necessary to continuously monitor the position of the pad. If it is not tightened correctly, the cover must be detached again.