Mitsubishi 6M60 Specifications
| Engine Model: Mitsubishi 6M60 |
| Engine Type: 4-cycle inline 6-cylinder OHC 24-valve turbocharged liquid-cooled diesel |
| Total Displacement: 460 cu.in (7.54 L) |
| Rated Engine Power: 243-270 Hp (181-199 kW) at 2500 rpm |
| Fuel System Type: Common rail direct injection |
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The Mitsubishi 6M60 is a 7.5-liter inline six-cylinder
diesel engine developed by Mitsubishi Fuso Truck and Bus Corporation for
medium-duty commercial vehicles and industrial applications. Produced as part of
the broader 6M engine family, this powerplant was engineered to meet the demands
of the Fuso Fighter truck series while also finding extensive use in forklifts,
excavators, and other off-highway equipment where durability and sustained
torque delivery are paramount.
The 6M60 represents a significant evolution from its predecessors through the
adoption of electronically controlled common rail fuel injection and variable
geometry turbocharging. These technologies enabled the engine to comply with
progressively stringent emissions regulations while maintaining the robustness
expected in commercial vehicle applications. The engine’s architecture
emphasizes serviceability, with an overhead camshaft design and gear-driven
accessory systems that contribute to reliability in high-mileage operations.
Throughout its production history, the 6M60 appeared in multiple output
configurations. The 6M60-T1 variant produces 243 hp (181 kW) at 2,600 rpm, while
the 6M60-9AT2 delivers 270 hp (199 kW) at 2,500 rpm. Torque output across the
family ranges from 784 to 798 Nm (578 to 589 lb-ft) available from 1,100 to
2,400 rpm, providing a broad, flat torque curve suited to the variable load
conditions encountered in distribution, construction, and material handling. The
engine’s 16.0:1 compression ratio balances cold-start capability with combustion
efficiency, while the air-to-air intercooler and variable geometry turbocharger
work in concert to maintain charge air density across the operating range.
The 6M60 operates on a four-stroke diesel cycle with compression ignition. The
engine utilizes an inline six-cylinder configuration with a single overhead
camshaft and four valves per cylinder.
Engine Type: Inline-6, water-cooled, 4-stroke, turbocharged diesel.
Displacement: 7,545 cc (460 cu.in).
Bore: 118.0 mm (4.65 in).
Stroke: 115.0 mm (4.53 in).
Compression Ratio: 16.0:1.
Firing Order: 1-5-3-6-2-4.
Idle Speed: 600-650 rpm, electronically governed.
Maximum Engine Speed: 2,900 rpm (governed).
Maximum Power (6M60-T1): 181 kW (243 hp) @ 2,600 rpm.
Maximum Power (6M60-9AT2): 199 kW (270 hp) @ 2,500 rpm.
Maximum Torque (6M60-T2): 784-798 Nm (578-589 lb-ft) @ 1,100-2,400 rpm.
Aspiration: Turbocharged with variable geometry turbocharger (VGT) and
air-to-air intercooler.
Combustion System: Direct injection with centrally located multi-hole injectors.
The cylinder block is constructed from high-strength
cast iron with a deep-skirt design that extends below the crankshaft centerline.
This architecture provides exceptional rigidity under the high cylinder
pressures associated with turbocharged diesel combustion while minimizing bore
distortion under thermal and mechanical loads.
The block features siamesed cylinder bores - adjacent cylinders share common
walls - reducing overall engine length while maximizing structural integrity
between cylinders. Cylinder bores are induction-hardened to provide a durable
wear surface without the use of replaceable liners. The hardening process
creates a martensitic layer approximately 1.5 mm (0.06 in) deep with a Rockwell
hardness of 50-55 HRC.
Main bearing caps are manufactured from sintered steel and secured with four
bolts each - two vertical bolts through the cap and two horizontal cross-bolts
through the lower crankcase structure. This cross-bolted arrangement provides
superior crankshaft support under the peak cylinder pressures exceeding 150 bar
(2,175 psi) characteristic of modern diesel engines.
Crankshaft: Forged steel with seven main bearings, fully counter-weighted with
eight counterweights. The crankshaft features induction-hardened bearing
surfaces and is dynamically balanced to minimize torsional vibration.
Main Bearing Journal Diameter: 85.0 mm (3.35 in).
Connecting Rod Journal Diameter: 70.0 mm (2.76 in).
Connecting Rods: Forged steel, fracture-split construction with a rectangular
cross-section design. Piston Material: Forged aluminum alloy with anodized ring
grooves and a high-silicon content for thermal stability under peak combustion
pressures.
Piston Cooling: Oil spray jets mounted in the crankcase direct a continuous
stream of engine oil to the underside of each piston crown. These jets are
calibrated to operate at oil pressures above 200 kPa (29 psi) and incorporate
check valves to maintain pressure during transient operation.
The cylinder head is a single-piece cast iron
construction spanning all six cylinders. This design ensures uniform sealing
across the cylinder bank and simplifies the valvetrain layout. The head
incorporates a cross-flow port arrangement with intake ports on the right side
and exhaust ports on the left side of the engine.
Valvetrain: Overhead camshaft (OHC) with four valves per cylinder, totaling 24
valves. The camshaft is driven by a gear train at the front of the engine and
operates the valves through roller-type rocker arms equipped with integrated
hydraulic lash adjusters.
Intake Valve Diameter: 42.0 mm (1.65 in).
Exhaust Valve Diameter: 38.0 mm (1.50 in).
Valve Lift (Intake): 11.5 mm (0.453 in).
Valve Lift (Exhaust): 11.5 mm (0.453 in).
Valve Clearance (cold): Intake 0.40 mm (0.016 in); Exhaust 0.50 mm (0.020 in).
Valve Seat Material: Sintered steel alloy with induction-hardened contact
surfaces.
Valve Spring Material: High-tensile steel with a beehive design to reduce
reciprocating mass.
Camshaft Drive: Gear-driven system with a steel timing gear mounted on the
crankshaft driving an intermediate idler gear, which in turn drives the camshaft
gear. This gear train is fully enclosed and lubricated by engine oil, providing
maintenance-free operation for the engine’s service life.
The fuel system is a high-pressure common rail direct
injection system manufactured by Denso. This system operates at pressures up to
1,600 bar (23,200 psi) and utilizes solenoid-type injectors capable of multiple
injection events per combustion cycle.
Fuel Injectors: Solenoid-type direct injectors with seven nozzle orifices per
injector. The injectors are capable of delivering up to five separate injection
events per cycle, including pilot injections for noise reduction, main injection
for power delivery, and post-injections for particulate filter regeneration.
High-Pressure Fuel Pump: Denso HP3 or HP4 two-piston radial-piston pump driven
by the engine’s gear train. The pump incorporates a suction control valve to
regulate fuel delivery and maintain common rail pressure independent of engine
speed. Common Rail: High-pressure accumulator manufactured from forged steel,
shared across all six cylinders. The rail incorporates a pressure sensor and a
pressure relief valve for system protection.
Low-Pressure Fuel System: 3.0-5.0 bar (44-73 psi) supplied by an electric lift
pump or mechanical feed pump, depending on vehicle configuration. Fuel Filter:
Spin-on type with integrated water separator, water-in-fuel sensor, and hand
primer pump. Fuel Requirement: Diesel fuel meeting EN 590 or equivalent
specification with sulfur content below 10 ppm for emissions compliance.
The lubrication system is a fully pressurized wet-sump
design with a gear-type oil pump mounted on the front of the engine. The pump is
driven directly by the crankshaft and incorporates a pressure relief valve to
maintain consistent oil pressure across the operating range.
Oil Pump Type: Gear-type pump with integrated pressure relief valve set at 700
kPa (102 psi). Recommended Oil Viscosity: 15W-40 or 10W-30 heavy-duty diesel
engine oil meeting API CI-4, CJ-4, or CK-4 specifications. Synthetic or
semi-synthetic formulations are recommended for extended drain intervals.
Oil Capacity (including filter): 23.0 liters (24.3 qt).
Oil Pressure (at idle, warm): 100-200 kPa (15-29 psi).
Oil Pressure (at 2,000 rpm, warm): 400-600 kPa (58-87 psi).
Oil Filter Type: Spin-on full-flow filter with integral bypass valve.
Oil Cooler: Plate-type coolant-to-oil heat exchanger mounted on the lower left
side of the engine.
Oil Pan: Stamped steel with integrated baffling, equipped with a replaceable
drain plug and oil level sensor.
The cooling system is a pressurized, thermostatically
controlled circuit utilizing a belt-driven centrifugal water pump. The system is
designed to manage the thermal demands of turbocharged diesel operation while
maintaining consistent cylinder head and cylinder block temperatures. Water Pump
Type: Centrifugal with a mechanical seal, mounted to the front of the cylinder
block and driven by the serpentine accessory belt.
Coolant Type: Ethylene-glycol based antifreeze meeting manufacturer
specifications, formulated for heavy-duty diesel applications with supplemental
coolant additive (SCA) requirements. Coolant Capacity (engine and radiator):
23.0 liters (24.3 qt). Thermostat: Wax-type thermostat with an opening
temperature of 82 °C (180 °F) and a full-open temperature of 95 °C (203 °F).
Radiator: Cross-flow aluminum radiator with plastic tanks and a high-density fin
package. Charge Air Cooling: Air-to-air intercooler mounted in front of the
radiator. Charge air temperatures after the intercooler are maintained within
15-25 °C (27-45 °F) of ambient temperature under steady-state operation. Cooling
Fan: Electric viscous clutch fan with on-demand engagement, controlled by engine
coolant temperature and intake air temperature sensors.
Exhaust System: Stainless steel exhaust manifold with
integrated mounting for the turbocharger. The aftertreatment system varies by
emissions standard but generally includes a diesel oxidation catalyst (DOC) and
diesel particulate filter (DPF) for engines meeting Tier 4 Interim and Euro 5
standards. Selective catalytic reduction (SCR) is incorporated for Tier 4 Final
and Euro 6 applications.
Exhaust Gas Recirculation: Cooled EGR system with an electrically actuated EGR
valve and an EGR cooler mounted on the exhaust side of the engine. EGR rates of
up to 20% are utilized to reduce nitrogen oxide (NOx) emissions.
Variable geometry turbocharger (VGT) manufactured by
Mitsubishi Heavy Industries or BorgWarner. The VGT system utilizes movable vanes
in the turbine housing to adjust the aspect ratio based on engine speed and
load. An electronic actuator positions the vanes to optimize boost response
across the operating range. Maximum boost pressure is 2.2 bar absolute (32 psi
gauge) under full load conditions.
Timing Drive: Gear-driven system with no chains or
belts requiring replacement. The crankshaft gear drives an idler gear, which
drives the camshaft gear, the high-pressure fuel pump gear, and the accessory
drive gears. All gears are helical-cut for quiet operation and are lubricated by
engine oil.
Accessory Drive: Single serpentine belt or multiple V-belts depending on
application, driving the water pump, alternator, power steering pump, and air
conditioning compressor. A spring-loaded automatic tensioner maintains belt
tension on serpentine belt configurations.
Engine Management System: Denso electronic control unit (ECU) integrated with
the vehicle’s powertrain management system. The ECU controls fuel injection
timing, injection pressure, boost pressure, variable geometry turbocharger
actuation, exhaust gas recirculation (EGR), and aftertreatment functions.
Emissions Compliance: Available in configurations meeting Euro 4, Euro 5, Euro
6, US EPA Tier 4 Interim, and Tier 4 Final standards depending on vehicle
application and market.
Overall Length: 1,250 mm (49.2 in)
Overall Width: 760 mm (29.9 in)
Overall Height: 1,080 mm (42.5 in)
Dry Weight (complete engine): 670 kg (1,477 lb)
Engine Oil and Filter Change: 15,000 km (9,000 mi) or
12 months under standard duty; 10,000 km (6,000 mi) or 6 months for severe
service including frequent cold starts, extended idling, or dusty environments.
Coolant Replacement: 60,000 km (37,000 mi) or 2 years. Coolant additive (SCA)
concentration should be tested at each oil change and replenished as required to
maintain cavitation protection.
Valve Clearance Inspection: Every 60,000 km (37,000 mi). Adjustment requires
replacement of the appropriate thickness shim or adjustment of the locknut-type
adjuster depending on valve train configuration. Cold clearance specifications:
Intake 0.40 mm (0.016 in); Exhaust 0.50 mm (0.020 in). Timing Gear Train: Gear
train inspection is required only if abnormal noise or timing correlation
diagnostic trouble codes are present.
Fuel Filter Replacement: 15,000 km (9,000 mi) or 12 months. The water separator
should be drained at every oil change or when the water-in-fuel warning lamp
illuminates. Engine Air Filter Element: Replace every 30,000 km (18,000 mi) or
when restriction indicator displays service required. More frequent replacement
is required in dusty environments.
Drive Belt Inspection: Every 15,000 km (9,000 mi) for cracks, fraying, glazing,
and proper tension. Drive Belt Replacement: 60,000 km (37,000 mi) or 3 years.
Injector Replacement: Injector performance should be evaluated if fuel
consumption increases, power output decreases, or cylinder balance diagnostic
trouble codes are present.
Diesel Particulate Filter (if equipped): Active regeneration occurs
automatically under normal operating conditions. Ash accumulation requires
filter cleaning or replacement at 200,000-300,000 km (124,000-186,000 mi)
depending on operating conditions and oil consumption.
Cylinder Head Bolts, Step 1: 50 Nm (37 lb-ft)
Cylinder Head Bolts, Step 2: 100 Nm (74 lb-ft) + 180° turn
Main Bearing Cap Bolts, Step 1: 100 Nm (74 lb-ft)
Main Bearing Cap Bolts, Step 2: 120 Nm (89 lb-ft) + 90° turn
Connecting Rod Cap Bolts:80 Nm (59 lb-ft) + 90° turn
Camshaft Bearing Caps: 30 Nm (22 lb-ft)
Camshaft Gear Bolt: 150 Nm (111 lb-ft)
Intake Manifold to Cylinder Head: 30 Nm (22 lb-ft)
Exhaust Manifold to Cylinder Head: 50 Nm (37 lb-ft)
Turbocharger to Exhaust Manifold: 45 Nm (33 lb-ft
Turbocharger Oil Feed Line: 30 Nm (22 lb-ft)
High-Pressure Fuel Pump Mounting Bolts: 40 Nm (30 lb-ft)
Common Rail Mounting Bolts: 50 Nm (37 lb-ft)
Fuel Injector Clamp Bolts: 25 Nm (18 lb-ft)
Oil Pan Bolts: 25 Nm (18 lb-ft)
Valve Cover Bolts: 20 Nm (15 lb-ft)
Valve Adjusting Lock Nut: 20.6 Nm (15.2 lb-ft)
Flywheel / Flexplate Bolts: 120 Nm (89 lb-ft) + 90° turn
Crankshaft Pulley Bolt: 400 Nm (295 lb-ft) + 90° turn
Engine Mount Brackets to Block: 80 Nm (59 lb-ft)
The 6M60 engine was extensively utilized across
Mitsubishi Fuso’s medium-duty truck lineup and found application in various
industrial equipment manufactured by Mitsubishi Heavy Industries and other OEMs.
Mitsubishi Fuso Fighter (1996-present): The 6M60 served as the primary engine
for the Fighter medium-duty truck series across multiple generations.
Applications include the FK, FM, and FV chassis configurations with gross
vehicle weight ratings from 10 to 25 tons. The engine was offered in various
power ratings to suit regional distribution, construction, and refuse collection
applications.
Mitsubishi Fuso Canter (selected markets): While the Canter series predominantly
utilized smaller displacement engines, certain heavy-duty Canter configurations
in specific markets received the 6M60 for applications requiring increased power
and torque capacity.
Mitsubishi Forklift Trucks: The 6M60 was installed in large-capacity diesel
forklifts, including the FD60 to FD100 series with lifting capacities from 6 to
10 tons. In forklift applications, the engine is calibrated for consistent
low-speed torque delivery and durability under sustained near-idle operation.
Mitsubishi Excavators: The engine powers medium-to-large hydraulic excavators in
the Mitsubishi product line, including the MS and ME series. Excavator
applications require specific cooling system configurations to accommodate the
reduced airflow encountered in trenching and demolition operations.
Mitsubishi Wheel Loaders: Selected wheel loader models received the 6M60 as the
primary powerplant, where the engine’s broad torque curve provides the necessary
tractive effort for bucket loading and material handling.
Industrial Power Units: The 6M60 is available as a stationary industrial engine
for generator sets, irrigation pumps, and other continuous-operation
applications. Industrial configurations include additional cooling capacity and
calibrated governing for constant-speed operation.
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