4M4x family

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The 4M4x family is a series of overhead camshaft direct injection diesel engines by Mitsubishi with aluminum heads, chain driven camshafts and balance shafts.

4M40

The 4M40 is a 2.8 Litre Single Overhead Camshaft engine with turbo charger and available with two forms of diesel injection. The early version of the engine used an ordinary distributor injection pump and produced 92 kW of power at 4000 rpm and 294 Nm of torque at 2000 rpm, while the later version used an electronically controlled distributor injection pump and produces 103 kW of power at 4000 rpm and 314 Nm of torque at 2000 rpm.

Technical Specifications

Type Longitudinally mounted 4 cylinder inline engine with single overhead camshaft and 2 valves per cylinder
Displacement 2835cc (2.8 litres)
Bore 95mm
Stroke 100mm
Compression Ratio 21:1
Fuel Injection Sequence 1,3,4,2
HEAD SPECIFICATIONS
Type Aluminum Alloy with swirl combustion chambers
Inlet Valve Diameter 43.00mm
Exhaust Valve Diameter 37.00mm
Valve Face Angle 45 º
Valve Clearance Maintained by shims
CAMSHAFT SPECIFICATIONS
Inlet Opens 19º BTDC
Inlet Closes 53º ABDC
Inlet Duration 252º
Exhaust Opens 60º BBDC
Exhaust Closes 16º ATDC
Exhaust Duration 256º
Overlap 35º






























4M41

The 4M41 is an enlarged version of the 4M40, displacing 3.2 litres. It features double overhead camshafts and electronically controlled direct injection (some with common-rail injection branded as DID).

It has been built with intercooled turbo, intercooled variable geometry turbo and intercooled variable geometry turbo with DID variants.

Early variable geometry turbo DID versions produce 121 kW at 3800 rpm and 373 Nm at 2000 rpm, with later models producing 125 kW at 3800rpm and 358 Nm at 2000rpm.

Technical Specifications

Type Longitudinally mounted 4 cylinder inline engine with double overhead camshafts and 4 valves per cylinder
Displacement 3200cc (3.2 litres)
Bore 98.5mm
Stroke 105mm
Compression Ratio 17:1
Fuel Injection Sequence 1,3,4,2
HEAD SPECIFICATIONS
Type Aluminum Alloy with swirl combustion chambers
CAMSHAFT SPECIFICATIONS
Inlet Opens 13º BTDC
Inlet Closes 31º ABDC
Inlet Duration 224º
Exhaust Opens 55º BBDC
Exhaust Closes 17º ATDC
Exhaust Duration 252º
Overlap 30º





























MITSUBISHI DIESEL ENGINES
4 cylinder
Astron 4D55 4D56
4D3x 4D30 4D31 4D33 4D35 4D36
4DR 4DR1 4DR5 4DR6
4D6x 4D65 4D68
4M4x 4M40 4M41