Engine UMZ-417: characteristics, repair

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

The UMZ-417 power unit is a classic engine with four in-line cylinders. To activate the pistons, a common crankshaft is used. The engine is equipped with a carburetor, contact fuel distribution and an OHV type gas distribution device, which has a lower camshaft. Consider its characteristics and features.

Description

The UMZ-417 motor has an aluminum cylinder head and housing. Cast iron sleeves are seated in the block by means of rubber o-rings. This design refers to the negative moments of the engine, as it reduces its strength.

The power unit under consideration is an improved version of the UMZ-4141, has a similar configuration with the ZMZ-402 motor. Differences of UMP-417 from its predecessor:

• Enhanced compression.
• Different type of camshaft.
• The presence of enlarged intake valves.
• Increased compression ratio.

Some modifications of this engine are equipped with a 421-series crankshaft installed without oil seals. The motor is distinguished from the ZMZ only by cylinder liners, which are placed using copper gaskets that provide additionalaggregate strength.

Modifications

Several variations of the engine in question have been developed. The most popular among them are the following modifications:

• UMZ-417.10. This engine runs on AI-76 fuel and was installed on UAZ vehicles under the index 3151.
• Version 4175.10 - mounted on GAZelles, has increased power ratings up to 98 horsepower. The engine compression is 8.2, which is enough to use gasoline with an octane rating of 92.
• Modification 4178.10 - is considered the most common model, equipped with a carburetor with a pair of chambers, allows you to operate the cylinder head from the 421st UAZ. In addition, the crankshaft of this model is equipped with an oil seal, and additional interaction is allowed with a hydraulic power steering or a diaphragm clutch assembly.

Technical characteristics of UMZ-417

The following are the parameters of the technical plan of the power unit in question:

• Displacement - 2445 cc
• Power - 92 "horses".
• Revolution - 4000 rotations per minute.
• Number of cylinders – 4.
• Piston travel - 92 mm.
• Compression – 8.2.
• Oil tank volume - 5.8 liters.
• Lubrication system - integrated type (splash plus pressure).
• Fuel consumption - 10.6 l / 100 km in mixed mode.
• Cooling is forced type liquid block with closed ventilation.
• Weight - 166 kg.
• Working resource - 150 thousandkilometers.

Maintenance and malfunctions

The UMP-417 engine is easy to prevent and maintain. Periodic replacement of engine oil is required (every 10 thousand km) and adjustment of thermal clearances on the timing valves (after 15 thousand km).

Possible motor malfunctions are listed below:

• Noises of an extraneous nature or knocking during the operation of the power plant. This can be affected by unadjusted timing valve clearances, deformation of the connecting rod bearings, malfunctions in the camshaft of the assembly.
• Perceptible vibration when starting and running the motor. Among the reasons: imbalance of the connecting rod and crank block, incorrect adjustment of the carburetor, failure in the contact ignition system.
• Motor overheating. This may be due to a broken thermostat, an atmospheric plug in the cooling circuit, or a malfunctioning water pump.

Modernization

UAZ UMZ-417 carburetor engines are often subject to improvement, which is aimed at increasing the power of the unit. One way is to replace the existing node with an injection system. The cost of such a rework is not always justified, since it is easier to purchase a new engine with distributed injection.

Among other ways to upgrade the motor in question, points such as:

• Balancing the cylinder-piston assembly.
• By milling the block head to 95 millimeters, compression is increased to 9.2.
• Changeexisting standard camshaft to an analog with a narrow-phase profile.
• Machining exhaust strokes up to 39 mm with the installation of suitable timing valves.
• Installing the exhaust manifold from the 421st model.
• Replacing the exhaust pipe with a 51 mm version.

These manipulations will increase the power of the power unit up to 100 horsepower.

Repair of UMP-417

The repair of the motor in question is divided into current and major repairs. In the first case, the performance of individual parts is restored or replaced. The capital part provides for the complete restoration of engine values to nominal values, by a complete overhaul of the installation. This will require disassembly of the motor.

Reasons for overhauling the UMZ-417 engine:

• Significant reduction in motor power.
• Reducing oil in the lubrication circuit.
• A noticeable increase in oil consumption (from 450 grams per 100 kilometers).
• Smoke power unit.
• Increased fuel consumption.
• Extraneous noises and sounds during operation, as well as a decrease in the compression ratio.

Result

When carrying out repair work with this motor, certain rules should be followed. During disassembly of the power unit, it is necessary to check each element for wear and the possibility of its further operation.

You can restore the working life of the engine by completely or partially replacing worn parts or theirresuscitation, if it is rational. Most often, connecting rod and main bearings of the camshaft, valve seats, bushings and other active parts are replaced.

When carrying out repair work, you need to remember about the standard gaps and timing tension. The deterioration of these indicators leads to a violation of the interaction of rubbing parts, their poor lubrication. This leads to accelerated wear of the elements. Do not forget to put marks in the places of subsequent installation of still suitable spare parts.

It is worth noting that reducing the control dimensions is also unacceptable, since it leads to a deterioration in the heat transfer of pistons and bushings. This results in excessive overheating. Before starting work, the UMZ-417 power unit should be cleaned of dirt and washed. The process itself is preferably carried out on a rotary stand.