Truck M-5 F90: repair and operation manual

Introduction: what is the M-5 F90 and why is it still in demand?

Truck M-5 F90 - a legendary model of the Soviet automobile industry, released on Minsk Automobile Plant (MAZ) in the middle of the 20th century. Despite their considerable age, these machines are still used in agriculture, construction sites and public utilities due to their unpretentiousness, maintainability and ability to work in extreme conditions. The design of the M-5 F90 was focused on mass production and ease of maintenance - most components can be repaired literally “on the knee” with a minimum set of tools.

The peculiarity of this model is biaxial layout with a lifting capacity of up to 5 tons and carburetor engine YaAZ-204 (later - YaMZ-236), which is famous for its “indestructibility”. However, given the age of the equipment, owners have to deal with typical problems: from body corrosion to transmission wear. In this article we will look at device M-5 F90, current prices for spare parts, step-by-step repair instructions and tips on how to extend the life of the legendary truck.

Technical characteristics of the M-5 F90: what's under the hood

Basic equipment M-5 F90 equipped 4-stroke diesel engine YaAZ-204 volume 6.97 l and power 110 hp. (at 2000 rpm). Later modifications received a more modern YaMZ-236 (180 hp), which significantly improved dynamics and load capacity. Transmission - 5-speed manual transmission with double disc clutch. The suspension is dependent, on semi-elliptical springs, which ensures high off-road maneuverability.

Key parameters:

• 🔧 Load capacity: 5000 kg (according to documents), in reality - up to 7 tons under moderate loads.
• 🛣️ Maximum speed: 65 km/h (with YaAZ-204), up to 80 km/h (with YaMZ-236).
• ⛽ Fuel consumption: 24–28 l/100 km (depending on load and engine condition).
• 🔋 Fuel tank capacity: 200 l (main) + 65 l (additional).

Parameter	YaAZ-204 (early models)	YaMZ-236 (late models)
Power, hp	110	180
Engine capacity, l	6,97	11,15
Fuel type	Diesel (DL, DZ)	Diesel (Euro-0)
Torque, Nm	412	667

One of the "chips" of the M-5 F90 was preheater system (PZD-30), which made it possible to start the engine even at −30°C. However, today many owners are replacing it with modern ones. electric heaters or autonomous heaters type Webasto or Eberspächer.

Typical faults and how to diagnose them

With age M-5 F90 exhibits “diseases” characteristic of Soviet technology. Here are the most common problems and their symptoms:

• 🔥 Engine overheating: most often caused radiator clogging or malfunction water pump. Check the antifreeze level and the condition of the pipes - cracks or softening of the rubber indicate the need for replacement.
• 🛢️ Increased oil consumption: if the engine “eats” more than 1 liter per 1000 km, the fault is worn piston rings or valve seals. Diagnose by blue smoke from the exhaust pipe.
• 🔊 Knock in transmission: may indicate play in the cardan shaft or bearing wear gearboxes. Check the gearbox mounting and the oil level in it.
• ⚡ Electrical problems: contact oxidation generator or starter, malfunction relay regulator. Symptoms: dim headlights, low battery.

⚠️ Attention: If you feel vibration in the steering wheel while driving, check immediately wheel balancing and condition wheel bearings. The M-5 F90 often wears out front axle king pins, which may lead to loss of control!

Useful for engine diagnostics compression gauge. Normal cylinder pressure for YaAZ-204 - 28–32 kg/cm², for YaMZ-236 - 30–35 kg/cm². If the values ​​are lower by 20% or more, a major overhaul is required.

How to check compression without a compression gauge?

You can use a simple method: remove the spark plug, plug the hole with your finger and crank the starter. If the finger “shoots” with force, the compression is normal. If pressure is barely felt, the cylinder is faulty.

Step-by-step instructions: changing engine and gearbox oil

Maintenance schedule M-5 F90 provides for changing the engine oil every 10,000 km, at the checkpoint - every 50,000 km. However, under difficult operating conditions (dust, off-road conditions, frequent overloads), it is better to reduce the interval by 30%. Here's how to do it right:

Changing the engine oil

1. Warm up the engine to operating temperature (60–70°C) so that the oil becomes less viscous.
2. Place a container with a volume of at least 12 liters under drain plug (located at the bottom of the crankcase).
3. Unscrew the plug with the key to 24 mm and wait until the oil is completely drained (10–15 minutes).
4. Replace oil filter (item: 2101-1012005 for YaAZ-204 or 740.1012005 for YaMZ-236).
5. Pour new oil through the filler neck on the valve cover. Suitable for YaAZ-204 M10G2k (mineral), for YaMZ-236 - M10DM (semi-synthetic). Volume: 10–11 l.

Changing the gearbox oil

For gearbox use TAD-17I or TM-5-18 (volume - 5 l). The drain plug is located at the bottom of the gearbox, the filler plug is located on the side. After replacement, check the operation of the gears: they should engage without crunching or effort.

Brake system repair: adjustment and replacement of pads

Brake system M-5 F90 — drum type with pneumatic drive. The main problem with old copies is brake pad wear and depressurization of the pneumatic system. Brakes should be adjusted every 5000 km or if the following symptoms occur:

• 🚗 Increased braking distance.
• 🔊 Creaking or squealing when braking.
• 🛑 “Soft” brake pedal (failing).

To adjust:

1. Jack up the rear axle and remove the wheel.
2. Through the inspection window in the drum, check the gap between the pads and the drum (standard: 0.2–0.4 mm).
3. With the help eccentric regulator (located on the support disk) ensure that the pads are evenly seated.
4. Check the stroke of the brake chamber rods (should be 20–30 mm).

⚠️ Attention: If after adjustment the brakes “pull” in one direction, check pressure uniformity in the pneumatic system or wear and tear brake cylinders. On the M-5 F90 often jams trailer brake control valve - it needs to be lubricated or replaced.

To replace the pads you will need:

• 🔧 Key on 17 mm (to remove the drum).
• 🔨 Hammer and wooden spacer (to knock down the drum if it gets stuck).
• 🛠️ New pads (item: 5320-3501090 for the front axle, 5320-3502090 for the rear).

Modernization of M-5 F90: what can be improved in an old truck

Despite his venerable age, M-5 F90 can be adapted to modern realities. Here are the most popular modifications:

• 🔋 Installation of a high-power generator: standard generator G-731 (28 A) often cannot cope with additional equipment. Replacement with G-287 (50 A) solves the problem.
• 💡 LED lighting: replacing incandescent lamps with LED (for example, H4 LED in headlights) improves visibility and reduces the load on the on-board network.
• 🛡️ Anti-corrosion treatment: the body and frame of the M-5 F90 are susceptible to rust. Helps effectively Movil or bitumen mastic (apply every 2–3 years).
• 🎛️ Hydraulic power steering: The stock steering mechanism is too tight. Installing power steering from ZIL-130 or GAZ-53 requires modifications, but makes it much easier to manage.

One of the most popular upgrades is replacement carburetor diesel engine with turbine (for example, YaMZ-238). This increases power to 240 hp. and reduces fuel consumption by 15–20%. However, such modernization requires:

• Substitutions gearboxes to enhanced (for example, from MAZ-500).
• Improvements cooling systems (installation of a more efficient radiator).
• Flashing fuel pump for a new engine.

⚠️ Attention: When replacing the motor, be sure to check compatibility pillow fasteners and attachment drives. In practice, it is often necessary to make adapter plates or modify the frame.

Where to buy spare parts for M-5 F90: prices and analogues

Find original spare parts for M-5 F90 It’s not easy today, but there are three options:

1. Showdown: the cheapest parts (for example, piston rings can be found for 500–800 rubles/set). Disadvantage: no quality guarantee.
2. Manufacturers of analogues: some factories (for example, OJSC "Avtoresurs") produce spare parts according to old drawings. Prices are higher, but the quality is stable.
3. Universal parts: many components (bearings, seals, belts) are suitable from other Soviet trucks (ZIL-130, GAZ-53).

Spare part	Original article	Price, rub (2026)	Analogue (from which car)
Brake pads (rear)	5320-3502090	1 200–1 800	ZIL-130 (3302-3502090)
Oil filter	2101-1012005	300–500	GAZ-53 (53-1012005)
Clutch (set)	MAZ-500-1601180	8 000–12 000	UAZ-452 (reinforced)
Front axle kingpin	5335-3004016	1 500–2 500	MAZ-5335

When purchasing spare parts, pay attention to:

• 📜 Availability of certificate (especially for critical parts like piston rings or liners).
• 🔍 Packing condition: If the box is torn or has traces of moisture, there may be corrosion inside.
• 💬 Seller Feedback: at sites like Avito or Drom.ru check the rating and transaction history.

Legal nuances: registration, technical inspection and operation

Operation M-5 F90 in 2026 is associated with a number of legal subtleties:

1. Registration with the traffic police: If the truck has been deregistered, you can restore the title through judgment (if there are documents from the previous owner) or examination (if there are no documents). Cost of the procedure: 10,000–30,000 rubles.
2. Technical inspection: for trucks over 30 years old is required every 2 years. The main problems during the passage are: rusty body and faulty brakes.
3. Ecological class: YaAZ-204 and YaMZ-236 engines correspond Euro-0, which imposes restrictions on entry into some cities (for example, Moscow and St. Petersburg without green zone they won't let you in).

For legal operation you will need:

• 📄 Sales and purchase agreement (if you buy used).
• 🚛 OSAGO policy (cost for trucks - from 5,000 rubles/year).
• 🔧 Diagnostic card (price of maintenance: 1,500–3,000 rubles).

⚠️ Attention: If you plan to use the M-5 F90 for commercial transportation, will be required cargo transportation license (for cargo over 3.5 tons) and tachograph (from 2023 mandatory for all trucks over 30 years old).

FAQ: answers to frequently asked questions about the M-5 F90

Is it possible to install a KamAZ engine on the M-5 F90?

Theoretically yes, but serious modifications will be required: replacement gearboxes, frames (engine mounts do not match), modification cooling systems and exhaust. In practice it is easier and cheaper to install YaMZ-238 — it is compatible with the original gearbox and requires minimal modifications.

What is the service life of the YaAZ-204 engine?

With proper maintenance (regular oil changes, no overheating) YaAZ-204 withstands 400,000–500,000 km before major repairs. There are cases when the engine traveled up to 800,000 km, but this requires ideal operating conditions and the use of high-quality spare parts.

What to do if the gears do not engage?

The reasons may be different:

• 🔧 Wear synchronizers Gearbox (box needs repair).
• 🛢️ Low oil level in the gearbox or its contamination.
• 🔗 Breakdown clutch drive (check cable or hydraulics).

Check first clutch — if it “drives”, the gears will shift into gear with a crunch. If the problem is in the gearbox, it will need to be disassembled.

How much does the M-5 F90 cost in 2026?

Price depends on condition:

• 🚜 "On the go" (requires minor repairs): RUB 150,000–300,000.
• 🔧 On recovery (has an engine, but does not drive): 80,000–150,000 rubles.
• 🗑️ For spare parts: 30,000–70,000 rub.

The most expensive copies - with engine YaMZ-236 and minimal corrosion (up to RUB 400,000).

Is it possible to operate the M-5 F90 without technical inspection?

No. According to Federal Law No. 170-FZ, all trucks over 30 years old are required to undergo maintenance every 2 years. Penalty for lack of diagnostic card - 2,000 rub. (Article 12.1 of the Administrative Code). An exception is if the truck is used in personal purposes (for example, for transporting hay in the country) and does not go on public roads.