Mitsubishi 6D14T Specifications
| Engine Model: Mitsubishi 6D14T |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 400 cu.in (6.56 L) |
| Rated Engine Power: 138-195 Hp (103-143 kW) at 2800 rpm |
| Fuel System Type: Direct injection |
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The Mitsubishi 6D14T is a 6.6-liter, inline
6-cylinder turbocharged diesel engine widely employed in heavy-duty
applications including Fuso trucks, construction excavators such as
Kobelco and Kato models, and industrial generator sets. This engine is
part of Mitsubishi's 6D14 series, which includes naturally aspirated,
turbocharged, and aftercooled variants.
The Mitsubishi 6D14T features a direct injection combustion system, an
overhead valve (OHV) valvetrain with 12 valves, and a water-cooled
design. Known for durability and high torque output, this engine
delivers power for demanding tasks including earthmoving equipment and
long-haul freight. The engine rotates counter-clockwise when viewed from
the flywheel end.
Engine Type: Inline 6-cylinder, 4-cycle, water-cooled turbocharged
diesel
Family: Mitsubishi 6D14 series
Number of Cylinders: 6
Valves per Cylinder: 2 (12 valves total)
Displacement: 6557 cc (6.6 L / 400 cu.in)
Bore x Stroke: 110 mm x 115 mm (4.33 in x 4.53 in)
Compression Ratio: 16.0:1 or 17.0:1 depending on variant
Combustion System: Direct injection
Firing Order: 1-5-3-6-2-4
Aspiration: Turbocharged (fixed geometry)
Maximum Power (Industrial/Automotive): 143 kW (195 hp) at 2800 rpm
Maximum Power (Excavator - Kato HD800VII): 103 kW (138 hp) at 2100 rpm
Maximum Power (General Truck Specification): 114-118 kW (153-158 hp)
Peak Torque (Fuso Truck): 420 Nm (310 lb-ft) at 1800 rpm
Low Idle Speed: 600-650 rpm
Rated Speed (Generator, 50 Hz): 1500 rpm
Rotation (facing flywheel): Counter-clockwise
Fuel Type: Diesel
The cylinder block is constructed from high-grade cast iron with a
deep-skirt design for maximum rigidity under heavy loads. Six cylinders
are arranged in an inline configuration.
The block incorporates seven main bearing supports to maintain
crankshaft alignment throughout the operating range. A forged steel
crankshaft ensures durability for sustained high-torque operation. The
block includes integrated oil galleries and cooling passages surrounding
each cylinder.
The cylinder head is manufactured from cast iron and utilizes an
overhead valve (OHV) configuration. The valve train operates two valves
per cylinder (one intake, one exhaust), totaling 12 valves. Valves are
actuated by pushrods and rocker arms from a camshaft located within the
cylinder block.
The direct injection combustion chambers are machined into the cylinder
head surface. Valve rotators are installed on exhaust valves to prevent
carbon buildup under sustained high-load operation. Valve Clearance
(Cold - Intake and Exhaust): 0.40 mm (0.016 in).
The engine employs a mechanical direct injection system. An inline
injection pump (Bosch or Zexel) meters and distributes fuel to
individual injection lines serving each cylinder. The pump includes a
mechanical centrifugal governor that maintains engine speed under
varying loads.
Pencil-type injectors with a preset opening pressure are installed one
per cylinder. A gear-type feed pump, mounted on the injection pump body,
draws fuel from the tank through a primary filter (water separator)
before supplying the secondary spin-on fuel filter.
Oil Capacity (with filter): 10.5-11.0 L (11.1-11.6 US qt)
Oil Pressure at rated speed: 40-60 psi (2.8-4.1 bar)
Recommended Oil Grade: SAE 15W-40 (API CD, CE, or CF)
Oil Filter: Full-flow spin-on type with integral bypass valve
System Features: A gear-type oil pump driven from the crankshaft draws
oil through a strainer inside the oil pan. An oil cooler, integrated
into the coolant circuit, maintains oil temperature within operational
limits.
Coolant Capacity (engine only): 9.0-10.0 L (9.5-10.6 US qt)
Thermostat opening temperature: 76.5°C (170°F)
Thermostat fully open temperature: 90°C (194°F)
Coolant Type: Ethylene glycol-based with corrosion inhibitors
Water Pump: Belt-driven centrifugal type
System Features: A bypass thermostat circuit maintains rapid warm-up.
The water pump circulates coolant through the cylinder block, cylinder
head, and oil cooler circuit.
| Intake and Exhaust Systems |
Air Intake System: Dry-type air cleaner with paper filter element. The
turbocharger (TD06 or TD07 series) is oil-cooled via a supply line from
the main oil gallery.
Exhaust System: Cast iron exhaust manifold with a single inlet to the
turbocharger.
Electrical System: 12 volt or 24 volt depending on application.
Starter Motor: 12V or 24V, pre-engaged type with solenoid, rated at
4.0-5.0 kW.
Alternator: 12V or 24V, 40-60 ampere output.
Glow Plugs: Installed for cold starting assistance.
Dry Weight: 540 kg (1190 lb)
Length (flywheel to front pulley): 1200 mm (47.2 in)
Width: 670 mm (26.4 in)
Height: 950 mm (37.4 in)
Engine Oil Change Interval: 250 hours under normal industrial duty.
Oil Filter Change: Every oil change.
Fuel Filter Change: 500 hours.
Fuel Filter (Primary/Water Separator) Drain: Daily inspection.
Valve Clearance Inspection Interval: 500 hours.
Air Cleaner Service Interval: When restriction indicator shows red or at
250 hours.
Coolant Change Interval: 1000 hours or 12 months.
Injector Inspection Interval: 1000 hours.
Valve Clearance Adjustment (cold - intake and exhaust): 0.40 mm (0.016
in).
Cylinder Head Bolts (M14 - Step 1): 78 Nm (57.5 lb-ft)
Cylinder Head Bolts (M14 - Step 2): Additional 180° angle turn
Main Bearing Cap Bolts (Step 1): 59 Nm (43.5 lb-ft)
Main Bearing Cap Bolts (Step 2): Additional 90° angle turn
Connecting Rod Bolts (Step 1): 69 Nm (51 lb-ft)
Connecting Rod Bolts (Step 2): Additional 90° angle turn
Flywheel Bolts (14 mm): 98-110 Nm (72-81 lb-ft)
Crankshaft Pulley Bolt: 200 Nm (147 lb-ft)
Rocker Arm Shaft Bracket Bolts: 22 Nm (16 lb-ft)
Valve Rocker Adjusting Locknut: 20 Nm (15 lb-ft)
Injection Pump Drive Gear Nut: 60 Nm (44 lb-ft)
Injector Clamp Bolts: 23 Nm (17 lb-ft)
Oil Pan Bolts: 12 Nm (9 lb-ft)
Water Pump Mounting Bolts: 18 Nm (13 lb-ft)
Starter Motor Mounting Bolts: 30 Nm (22 lb-ft)
Turbocharger Mounting Nuts: 35 Nm (26 lb-ft)
The Mitsubishi 6D14T engine is installed in a wide range of heavy-duty
vehicles, construction machinery, and industrial equipment.
Heavy-Duty Trucks: Mitsubishi Fuso trucks (various models including
Fuso, Standard, and Challenger).
Construction Excavators: Kato HD770SE, HD800VII, HD880SE , Kobelco
excavators.
Construction Loaders: Komatsu SK07-2 wheel loaders.
Generator Sets: 93.75 kVA standby and prime power units (50 Hz at 1500
rpm).
Industrial Power Units: Stationary units for pumps and material handling
equipment.
Truck Applications: Medium to heavy-duty freight transport and long-haul
operations.
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