Mitsubishi S4Q2 engine

S4Q2 is a 4-cylinder water-cooled inline diesel engine produced by Mitsubishi. It is widely used in forklifts, excavators, generator sets, construction machinery and agricultural machinery. It is favored by users for its high durability, fuel economy and low maintenance cost.

1. Main technical parameters
Parameter Value
Engine type Inline 4-cylinder, 4-stroke, water-cooled diesel engine
Displacement 2.505L (2505cc)
Cylinder diameter × stroke 88mm × 103mm
Compression ratio 22.4:1
Maximum power 35 – 50 HP (about 26 – 37 kW), depending on the adjustment
Maximum torque 140-160 N·m
Rated speed 2300 – 2800 rpm
Fuel system Mechanical injection system (some versions with turbocharger)
Cooling method Water cooling
Starting method Electric start
Lubrication system Oil pressure lubrication
Applicable fuel 0# or lower grade diesel
2. Main features
✅ Durable and reliable: suitable for heavy-duty working environment, long engine life.
✅ Good fuel economy: efficient combustion system, low fuel consumption, and reduced operating costs.
✅ Easy to maintain: simple structure, easy maintenance, and high versatility of parts.
✅ Low noise & low emission: Optimize the combustion chamber design to reduce exhaust emissions.
✅ Widely applicable: Can be used for forklifts, excavators, generators, agricultural machinery, etc.

3. Applicable equipment (examples of some brands)
Forklifts: Mitsubishi, Komatsu, TCM, Linde, etc.
Small excavators: Kubota, Yanmar, Hitachi, etc.
Generators: Mitsubishi’s own and some OEM brands
4. Maintenance recommendations
Oil replacement: It is recommended to replace it every 250-500 hours (depending on the working conditions).
Air filter: Clean or replace regularly to prevent poor air intake from affecting power.
Fuel system: Use clean diesel and check the injectors and fuel filter regularly.
Cooling system: Check the antifreeze level to prevent the engine from overheating.