Repairing the K-M carburetor on a ZIS 150 truck often becomes necessary when there are traction failures or unstable engine operation at idle, which requires immediate intervention in the mixture formation system. Owners of rare equipment and restorers are faced with wear of jets or leakage of throttle valves, which directly affects the fuel consumption and acceleration dynamics of a heavy vehicle. To restore standard characteristics carburetor requires complete disassembly of the unit, ultrasonic cleaning of the channels and replacement of rubber seals, since modern analogues may not be suitable without modification.
History ZIS 150 began in the post-war years, when the country needed a massive, reliable truck capable of replacing the obsolete three-ton GAZ-AA. This car became a symbol of the restoration of the national economy, transporting tons of cargo from factories to construction sites throughout the Soviet Union. Engineers from the Moscow plant named after Stalin created a machine that combined ease of maintenance and sufficient load capacity for that time.
Structurally ZIS 150 was a two-axle vehicle with rear driving wheels, equipped with a gasoline internal combustion engine. The absence of power steering and synchronizers in the gearbox required high skill and physical strength from the driver, but it was these features that made the car recognizable and loved by drivers of that generation.
Technical characteristics and engine design
The heart of the car was carburetor engine ZIS-120, which was an in-line six-cylinder power plant of the lower valve type. The engine displacement was 5555 cubic centimeters, which made it possible to develop a power of 90 horsepower at 2600 rpm. This configuration provided high torque at low speeds, which was critical for hauling heavy loads over rough roads.
The power system included carburetor K-M, which ensured the preparation of a combustible mixture. The engine had a liquid cooling system with forced circulation driven by a centrifugal pump. The reliability of the power unit was achieved due to the simplicity of the design and the use of cast iron for the manufacture of the cylinder block and head.
⚠️ Attention: When operating the ZIS-120 engine, strictly monitor the temperature regime. Overheating of a lower valve engine can lead to burnout of valves and deformation of the cylinder head due to differences in the thermal expansion of materials.
The car's transmission consisted of a dry single-plate clutch and manual transmission, having four forward gears and one reverse. The absence of synchronizers required the use of double clutch release when switching, which increased acceleration time, but made the design extremely reliable and repairable in field conditions.
Chassis and braking system
Chassis ZIS 150 was based on a spar frame to which the front and rear suspensions were attached. The front suspension was dependent, on a transverse spring with a pivot system, which provided strength, but was not very comfortable. The rear suspension was also spring, balanced, with reaction bars, which made it possible to effectively distribute the load on the rear wheels when the body was fully loaded.
The truck's braking system was mechanical, with a cable drive on all wheels, which was one of the main disadvantages of the model compared to more modern analogues. The driver had to make significant efforts to stop the loaded car, especially on descents. Later modifications and some specialized versions received hydraulic drive brakes, which significantly improved operating safety.
The wheels of the car were stamped discs, with tires measuring 10.00-20 inches. The spare wheel was located on the right side member of the frame or in the body, depending on the configuration. The suspension and frame were designed to work with overloads, which was often encountered in the realities of the post-war period, but this reduced the service life springs and shock absorbers.
Main modifications of the truck
Based on the base model ZIS-150 Many modifications have been created to perform various tasks. The plant constantly improved the design, introducing new solutions and adapting the car to the specific needs of the national economy. Each version had its own unique features in the design of the body or transmission.
Rare modifications of ZIS 150
There are rare versions, such as the ZIS-150A with shielded electrical equipment for operation in conditions of radio interference, as well as prototypes with gas generator units running on charcoal.
Among the main versions, dump trucks, truck tractors and vehicles with an extended wheelbase stood out. Dump truck ZIS-MM-5 received a metal cabin and a body with three-way unloading, which significantly expanded the scope of its use in construction. Tractors were used to tow semi-trailers, ensuring the delivery of large loads.
| Modification | Body type/Purpose | Load capacity (kg) | Features |
|---|---|---|---|
| ZIS-150 | Flatbed truck | 4000 | Wooden cabin |
| ZIS-MM-5 | Dump truck | 3500 | Metal cabin |
| ZIS-10 | Truck tractor | 11000 (train) | Short frame |
| ZIS-150V | Export | 4000 | Increased comfort |
Maintenance and common faults
Operation ZIS 150 in modern conditions requires a special approach to maintenance. The main problem remains the wear and tear of engine and transmission parts, as well as the search for original spare parts. Regularly changing the oil in the engine and gearbox, as well as lubrication of all chassis components are mandatory procedures to maintain the performance of the equipment.
A common problem is wear and tear. crankshaft bearings and piston rings, which leads to a drop in compression and increased oil consumption. The ignition system also requires attention: the distributor-distributor and the ignition coil often need to adjust the gaps and replace high-voltage wires for stable sparking.
☑️ Daily maintenance ZIS 150
In an electrical system, the DC alternator and starter often fail. Critical monitor the condition of the relay regulator, since overcharging or undercharging the battery can lead to failure of all electrical equipment of the car. The use of modern batteries requires checking the charging current.
Comparison with foreign analogues of that period
At the time of its appearance ZIS 150 was not inferior, and in a number of parameters was superior to the American International Harvester and GMC trucks, from which it was partially copied. Soviet engineers strengthened the frame and adapted the engine to harsher climatic conditions and low-quality fuel, which made the vehicle more durable in operation.
Unlike European analogues, such as Mercedes-Benz L 3000, The ZIS 150 had a simpler engine design, which made repairs easier in the absence of specialized services. However, the lack of power steering and synchronizers made driving more labor-intensive compared to advanced Western models of the late 40s.
⚠️ Attention: When restoring a ZIS 150, it is not recommended to use modern synthetic oils without consulting a specialist. Old engines with Babbitt bearings require oils with a specific additive package and viscosity corresponding to the clearances of that time.
Cultural heritage and collection value
Today ZIS 150 is a desirable exhibit for vintage car collectors and automotive museums. The surviving examples undergo careful restoration, returning to their original appearance. Participation in vintage car parades and exhibitions allows us to popularize the history of the domestic automotive industry.
The cost of a restored truck depends on its condition, completeness and ownership history. Original parts such as headlights, emblems and interior elements can be very expensive due to their rarity. Owners of such cars often form clubs to exchange experiences and spare parts.
Advice for restorers: When painting the ZIS 150 cabin, use nitro enamels or special retro paints, which give that same deep, “lively” shine characteristic of cars of the 40-50s, instead of modern acrylic coatings.
Interest in this model does not fade, since it represents an important stage in the history of industrialization and development of the country's transport system. Each restored specimen is a living memory of the work and engineering of past generations.
What is the maximum speed of the ZIS 150?
The maximum speed of a ZIS 150 truck with a full load was about 60 km/h, and without a load the vehicle could accelerate to 70-75 km/h. However, prolonged driving at maximum speed was not recommended due to the risk of engine overheating and increased tire wear.
How much gas mileage does this truck get?
The fuel consumption of the ZIS 150 directly depended on operating conditions and engine condition. On average, it was 25-30 liters of A-66 or A-72 gasoline per 100 kilometers. When driving with a full load over rough terrain, consumption could reach 35 liters.
Is it possible to use the ZIS 150 as a daily car?
Using the ZIS 150 as a daily vehicle in a modern city is extremely difficult. Lack of comfort, low speed, high fuel consumption, difficulties with parking large equipment and problems with passing environmental standards make it suitable only for rare trips or participation in retro events.
⚠️ Attention: When purchasing a ZIS 150 for restoration, carefully inspect the frame for cracks and corrosion. Restoring frame geometry is a complex and expensive process that can exceed the cost of the car itself.