UMZ-421, engine: specifications

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The UMZ-421 engine has a rich history. There are several modifications of this device. They are actively installed on cars of the UAZ series. Amplifiers in them are used vacuum type. According to experts, the devices are distinguished by a high step. At the same time, the tensioners are able to withstand heavy loads. To understand the engine in detail, it is recommended to consider its performance.

General device settings

Model 421 (engine) has the following characteristics: four cylinders, ring diameter 100 mm. The compression ratio is 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. Specific fuel consumption depends on the type of modification.

Engine device

Model 421 (engine) includes cylinder block, carburetor, and 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 through valve. The motor shaft is used with a diameter of 2.4 cm. The connecting channel is connectedwith hose. The fixation block is located at the top of the device. There is a filter under the carburetor. The tensioner of the modification is used with a tank.

Oil filler

The oil filler for model 421 (engine) is installed on the side of the device. The recirculation valve is designed for high pressure. Exhaust gases exit through the hole. An overlay is used to avoid block wear. The lower pulley in the device is protected from gases. There is a hose to drain the used oil. There is no filter in this case.

Inlet department

The choke department at the engine 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 tube is located under the carburetor. A rack is used for the partition. If we consider the UAZ-421 engine, then its crankcase is used with a hose. There are three filters in total.

The tank is fixed with 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. There is a lining on the engine stand. If you look at the top of the device, there is an air filter. Under it is a block for the connector. Pulley for 421 engine ("Gazelle") is installed under the tank. It should also be noted that the model has supply hoses that are necessary for cooling the system.

Engine starter

The starter for the UMZ-421 engine is installed with a locking mechanism. It has three blocks in total. Experts say that the model is able to work at low speeds. A contactor is used to close the circuit. Three conductors are connected to the starter of the device.

Device heatsink

The model's radiator is connected to the starter. The connector for model 421 (motor) is placed under the block. The pulley in this case is applied by 3 mm. One hose comes out of the expander. If we consider the upper part, then we must mention the presence of wire channels for venting gases. There are also special clamps that are attached to the nuts. In order to disconnect them, keys are used. In this case, the shaft must be well fixed. After disconnecting the pump, you will be able to inspect the starter.

Modification 421.10

The specified modification 421 (engine) has the following characteristics: maximum torque 221 ks per meter, average speed reaches 2500 per minute. A model with an extended pin is produced. She has a carburetor with a drive. The valve is directly used with a tensioner.

It should also be noted that the device stands out for its wide output. Considering the UAZ-421 engine, you can see that its tensioner is used with a tube. Channels are made with overlays. The 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 the hoses from the carburetorfly out frequently. Additionally, there may be problems with the connector. In this case, it is fixed under the drive. The fan of the model is able to operate at high speed for a long time.

Engine 4215.10

The presented modification 421 (engine) is made with a ventilation crankcase. The drive is applied to two outputs. If we talk about the advantages of modification, it is important to note that it can withstand large overloads. The oil pump is of high quality, and the drain pipe is rarely dirty. Also, experts point to the good conductivity of the channels. Nagar on them is very rarely observed. The carburetor is standard used with a rack. It is also worth mentioning that the connector is installed at the bottom of the engine.

Engine modification 4218.10

The presented 421 engine (injector) is made with durable seals. The 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. The model has three pulleys in total.

It should also be noted that the fan is capable of maintaining high speeds. The pump is used with a connector. The tensioner is mounted at the bottom of the engine next to the lever. The drive is fixed on the nut. In order to repair the device, you will first have to remove the radiator. Afterall that remains is to fix the upper pulley and turn the bolt clockwise. The expander is removed from the engine with a key. The lining on the lid is selected with a small thickness.

Starter repair

The starter of this modification fails, as a rule, due to the disconnection of the contacts. In order to check them, the connector block is removed with a key. The next step is to inspect the surface of the tank. If oil leaks are visible on it, a punctured hose must be found. Also, the problem may lie in the shift of the tank. In this case, the branch pipe closes.

The supply is inspected last. To disconnect the starter, you need to prepare a Phillips screwdriver. The fitting in this case does not need to be touched. A screwdriver can be used to unscrew the hoses. The first starter fastener is located near the expander. In this case, the hoses must not be touched. After removing the bolts, it remains only to remove the starter. You can do this on your own without the help of others. To check the operation of the contactor, the protective cover is unscrewed. If the clamping plates do not fit snugly against the wires, they must be tightened. You can do it manually.

Replacing the pad on the connector

Replacing the overlay on the connector is quite simple. If a leak occurs, the engine should be flushed first. After that, it is important to make sure that the problem lies in the connector. Further, in order to repair the 421 engine, it is necessaryproceed directly to the inspection of the detail. To do this, you have to twist the top pulley. The next step is to inspect the tank of the device. The cover of the model is removed with a key.

The propellers on the engine are on the sides. It is worth noting that the lid must be lifted very carefully. The lining should not fall through to the filter. It should also be noted that you will have to hold the tank. The lining must be clean and elastic. If darkening is visible, then it will have to be replaced. After the operation, the cover is put in its original place. Fasteners are wound gradually. In this case, it is necessary to continuously monitor the position of the lining. If it is not tightened correctly, then the cap must be removed again.