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Mitsubishi 4D36 Specifications
| Engine Model: Mitsubishi 4D36 |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 238.4 cu.in (3.91 L) |
| Rated Engine Power: 105 Hp (77 kW) at 3200 rpm |
| Fuel System Type: Direct fuel injection |
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- Mitsubishi 4D30 Engine Specifications
- Mitsubishi 4D31 Engine Specifications
- Mitsubishi 4D33 Engine Specifications
| General Technical Data |
The Mitsubishi 4D36 is a four-cylinder, four-stroke, water-cooled diesel engine belonging to Mitsubishi’s long-running D-series family. Introduced in the late 1980s as a development of the 4D35, it became a mainstay power unit in light and medium-duty trucks, buses, and industrial equipment.
The engine was conceived for applications
demanding high reliability, low maintenance, and long service life
rather than outright performance. Built around a cast-iron block and a
direct-injection combustion system, it represents Mitsubishi’s
transition from older pre-chamber diesel designs to more efficient
direct-injection systems.
Two main generations exist: the early naturally aspirated (NA) version,
typically rated around 100–105 PS, and the later turbocharged and
intercooled version, producing up to 120–125 PS with improved torque and
cleaner combustion. Both variants retained the same basic architecture
and external dimensions, allowing interchangeability across vehicle
platforms such as the Canter, Rosa, and various industrial machinery.
Renowned for its robustness and simple mechanical design, the 4D36
remains widely used and serviceable decades after production ceased.
The Mitsubishi 4D36 is an inline-four configuration with a displacement
of 3,907 cc (3.9 liters or 238.4 cubic inches). This displacement is
derived from a bore of 104.0 mm (4.09 inches) and a stroke of 115.0 mm
(4.53 inches). The compression ratio is 17.5:1 on the naturally
aspirated engine and 18.0:1 on the turbocharged version. The engine
operates on the diesel cycle with direct fuel injection into a
re-entrant combustion bowl formed in the piston crown. Firing order is
1-3-4-2, and crankshaft rotation is clockwise viewed from the flywheel.
The cylinder block is a one-piece cast-iron unit with deep skirts for
stiffness. Wet-type replaceable cylinder liners provide serviceability
and cooling uniformity. The forged-steel crankshaft runs in five main
bearings with replaceable bearing shells. A hardened surface treatment
and generous journal diameters ensure long fatigue life under high
loads.
The connecting rods are forged steel with a split big-end design and are fitted with bronze-bushed small ends to accommodate fully floating piston pins. Pistons are aluminum alloy with three rings - two compression and one oil control.
The cylinder head is cast iron on early
versions and a higher-grade alloy cast iron on later units to better
resist thermal cracking from turbocharger heat. Each cylinder has two
valves operated via pushrods and rocker arms from a single camshaft
located in the block. Valve clearance adjustment is manual through
locknut and screw type tappets.
Rated output for the naturally aspirated 4D36 is approximately 77 kW
(105 PS, 104 bhp) at 3,200 rpm, producing a peak torque of about 265 Nm
(195 lb-ft) at 1,800 rpm. The turbocharged variant delivers around 92 kW
(125 PS, 123 bhp) at 3,200 rpm, with torque rising to roughly 330 Nm
(243 lb-ft) at 1,800 rpm. Idle speed is 700 ± 50 rpm, and the governor
cutoff speed is approximately 3,600 rpm. Continuous operation is
generally maintained below 3,000 rpm for durability.
The camshaft is gear-driven from the crankshaft through a series of
hardened steel timing gears housed at the front of the engine. This gear
train also drives the fuel injection pump and the oil pump, ensuring
precise timing without the need for belt maintenance. The flywheel end
houses the rear main seal and pilot bearing for transmission coupling.
The flywheel itself is a heavy cast-iron unit that contributes to smooth
running and stable idle characteristics.
| Fuel System |
The 4D36 uses a direct-injection diesel fuel system of purely mechanical
design. Fuel is supplied from the tank by a cam-operated mechanical feed
pump through a fine-mesh primary filter and a replaceable secondary
cartridge filter. The injection pump is a Bosch-type inline mechanical
pump with individual delivery elements for each cylinder, governed
mechanically by an all-speed centrifugal governor. Injection timing is
fixed at approximately 10° before top dead center at idle, advancing
automatically with engine speed.
Injectors are multi-hole pintle-type nozzles operating at an opening
pressure of about 190 bar (2,750 psi) for the NA engine and 210 bar
(3,045 psi) for the turbocharged version. The injection lines are
high-pressure steel tubing with uniform length to maintain consistent
injection timing across cylinders. A fuel return circuit routes excess
diesel back to the tank, ensuring cooling of the pump and injectors.
In later production, Mitsubishi incorporated minor updates such as
hardened plunger barrels, improved cam profiles, and higher-flow
delivery valves to support turbocharging and emission compliance. Fuel
quality is critical - clean, low-sulfur diesel with cetane rating above
50 is recommended to prevent injector coking and ensure easy cold
starts. The hand primer pump and fuel-bleed screws on the filters
facilitate manual bleeding during servicing.
| Lubrication System |
The lubrication system is a full-pressure wet-sump type. A gear-type oil
pump driven by the timing gear draws oil through a coarse strainer in
the sump and delivers it under pressure through a full-flow spin-on
filter to the main oil gallery. From there, oil is distributed to
crankshaft main bearings, connecting rod journals, camshaft bearings,
and valve train components. Piston cooling jets spray the undersides of
the pistons to control temperature and prevent scuffing - an important
feature on the turbocharged model.
Normal oil pressure is approximately 350–500 kPa (50–72 psi) at 3,000
rpm and 100 kPa (15 psi) minimum at idle. Total oil capacity including
filter is about 8.0 liters (8.5 US quarts, 7.0 Imp quarts). Recommended
oil grade is SAE 15W-40 for most climates or SAE 10W-30 for colder
regions, meeting API CF, CF-4, or later diesel classifications. The
crankcase ventilation system employs a closed-circuit breather located
on the rocker cover that returns blow-by gases to the intake for
emission control.
Regular oil changes at 10,000 km (6,000 miles) are vital for longevity.
Under severe service, intervals are halved. Oil filter replacement is
mandatory with each oil change. Later turbocharged units use a slightly
larger filter element and an external oil cooler mounted near the front
of the block.
| Cooling System |
The cooling system is a pressurized, forced-circulation type with a
belt-driven centrifugal water pump mounted at the front of the engine.
Coolant circulates through passages in the block and head, then through
the radiator and heater core. A wax-pellet thermostat begins to open at
82 °C (180 °F) and is fully open by 95 °C (203 °F). The radiator cap
maintains system pressure around 90 kPa (13 psi).
The coolant capacity is approximately 12 liters (12.7 US quarts, 10.6
Imp quarts). The recommended mixture is 50 percent ethylene-glycol
antifreeze and 50 percent distilled water, providing freezing protection
to –35 °C (–31 °F). Later turbocharged versions employ a larger-capacity
radiator and, in certain trucks, a viscous-clutch fan for improved
thermal management.
A coolant temperature sender for the gauge and another for the glow-plug
control relay are fitted. The water pump and thermostat should be
inspected at every major service interval, and coolant replaced every
two years or 40,000 km (25,000 miles).
| Intake and Exhaust Systems |
On naturally aspirated models, the intake system consists of a dry-type
air cleaner connected to an aluminum intake manifold with equal-length
runners. Turbocharged versions use a Mitsubishi TD04 or TD05 small
single turbocharger operating at approximately 0.6 bar (8.7 psi) boost.
An air-to-air intercooler mounted in front of the radiator lowers intake
temperature and increases air density, improving power and reducing
emissions.
The exhaust manifold is cast iron with a separate outlet flange for the
turbocharger on later engines. Exhaust gases pass through a steel-tube
downpipe to the muffler and tailpipe. The EGR (exhaust gas
recirculation) system was added on late-production turbo engines to meet
emission regulations, reintroducing a small proportion of exhaust gas
into the intake to reduce NOx formation.
Air filtration uses a replaceable paper-element filter, serviced every
20,000 km (12,000 miles). Intake noise is minimized through resonator
chambers. The turbocharger lubrication is fed from the main oil gallery
and drains back into the sump through a dedicated return line.
| Electrical System |
The 4D36 electrical system operates on 12 volts DC. The alternator is
typically rated at 50 to 70 amperes, driven by a V-belt shared with the
water pump. The starting system uses a heavy-duty 2.0 kilowatt
reduction-gear starter motor capable of cold-weather cranking.
Cold starting is assisted by a glow-plug system with four sheathed-type
plugs located in the pre-combustion chambers. The glow controller relay
energizes the plugs for 5–10 seconds prior to cranking, depending on
coolant temperature. In extreme climates, some versions incorporate an
intake-air heater or fuel pre-heater.
The battery capacity ranges from 80 to 100 ampere-hours depending on
vehicle application. All sensors and gauges - oil pressure, water
temperature, and charge - are conventional analog senders. Later engines
include a warning light circuit for oil pressure and overheat
conditions.
| Other Systems |
A mechanically driven vacuum pump mounted on the rear of the alternator
provides vacuum for brake boosters in truck applications. The engine’s
governor lever connects to a simple mechanical accelerator linkage, and
idle speed can be adjusted via an external screw on the injection pump.
The timing gear housing also contains a tachometer drive.
Crankcase ventilation, EGR (on later models), and fuel-return systems
form part of the emission-control package. The engine mounts use rubber
isolation blocks to reduce vibration transfer to the chassis.
| Dimensions and Weight |
Overall length of the 4D36 engine assembly is approximately 890 mm (35.0 inches), width 650 mm (25.6 inches), and height 890 mm (35.0 inches). Dry weight is around 305 kg (672 lbs) for the naturally aspirated version and approximately 320 kg (705 lbs) for the turbocharged model. The block-to-head height measures 585 mm (23.0 inches). These dimensions allow installation in longitudinal engine bays of light and medium trucks and buses without modification.
| Maintenance Data |
Mitsubishi specifies the following service guidelines: Engine oil and filter should be replaced every 10,000 km (6,000 miles) or six months, whichever occurs first. The air cleaner element is replaced every 20,000 km (12,000 miles) and cleaned at shorter intervals in dusty environments.
Fuel filters (primary and secondary) are replaced every 30,000 km
(18,600 miles). Valve clearance inspection and adjustment should be done
every 20,000 km (12,000 miles) with cold engine clearance set to 0.25
millimeter (0.010 inch) intake and 0.35 millimeter (0.014 inch) exhaust.
Cooling system flushing and coolant renewal occur every 40,000 km
(25,000 miles). Check drive-belt tension and condition at each oil
change. The turbocharger oil feed and return lines should be inspected
for leakage every 20,000 km. Glow-plug function and compression pressure
should be checked periodically to maintain easy starting.
Normal compression pressure is about 2,940 kPa (426 psi) per cylinder at
200 rpm, with a minimum acceptable value of 2,450 kPa (356 psi) and a
maximum difference between cylinders not exceeding 490 kPa (71 psi).
Idle speed should be 700 ± 50 rpm; maximum no-load speed should not
exceed 3,600 rpm.
The engine can achieve more than 500,000 km (310,000 miles) between
major overhauls with proper maintenance. Common wear areas after
prolonged service include piston rings, valve guides, and injector
nozzles, all of which are easily replaceable.
| Tightening Torques |
Cylinder head bolts: tighten in three stages - first 49 Nm (36 lb-ft),
second 98 Nm (72 lb-ft), then final angle tightening 90 degrees.
Main bearing cap bolts: 118 Nm (87 lb-ft).
Connecting rod bolts: 59 Nm (44 lb-ft) plus 90 degrees.
Flywheel bolts: 157 Nm (116 lb-ft) plus 90 degrees.
Crankshaft pulley bolt: 245 Nm (181 lb-ft).
Rocker shaft bracket bolts: 24 Nm (18 lb-ft).
Valve cover bolts: 9 Nm (7 lb-ft).
Injector retaining nuts: 25 Nm (18 lb-ft).
Glow plugs: 15 Nm (11 lb-ft).
Oil drain plug: 44 Nm (32 lb-ft).
Intake manifold nuts: 25 Nm (18 lb-ft).
Exhaust manifold nuts: 35 Nm (26 lb-ft).
Engine mounting bolts: 68 Nm (50 lb-ft).
| Vehicle Applications |
The Mitsubishi 4D36 engine was widely
installed across a variety of commercial and industrial vehicles:
– Mitsubishi Canter (FE series) light-duty trucks, late 1980s through
2000s.
– Mitsubishi Rosa minibuses, particularly early 1990s variants.
– Mitsubishi Fuso FE and FG export models in Asia, Africa, and the
Middle East.
– Various industrial and stationary power units, including compressors,
generators, and marine auxiliaries.
The turbocharged 4D36 T and 4D36 TI variants were typically fitted to
heavier Canter configurations, while naturally aspirated versions served
lighter chassis and non-emission markets.
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