Mitsubishi 8DC9 Specifications
| Engine Model: Mitsubishi 8DC9 |
| Engine Type: 4-cycle 8-cylinder V-block liquid-cooled diesel |
| Total Displacement: 978.3 cu.in (16.03 L) |
| Rated Engine Power: 300-440 Hp (221-328 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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The Mitsubishi 8DC9 is a heavy-duty,
8-cylinder, V-type diesel engine that served as a mainstay for the
Mitsubishi Fuso heavy truck lineup (such as the FV415) and various
industrial applications throughout the 1980s and 1990s. It is known for
its balance of displacement and durability, bridging the gap between the
smaller 8DC8 and the larger 8DC10 and 10DC11 engines within the DC
series. The engine was produced in naturally aspirated, turbocharged,
and twin-turbocharged configurations, with later variants featuring
intercoolers for enhanced performance.
The Mitsubishi 8DC9 represented a continuation of the DC engine series
that began development in 1967 to meet the demands of the burgeoning
Japanese expressway network. Built with a 90-degree V8 configuration,
the engine utilizes a 135 mm bore and 140 mm stroke to achieve a
displacement of 16.03 liters. It employs a direct injection fuel system
and a 4-stroke, water-cooled design.
The Mitsubishi 8DC9 became a popular choice for heavy-duty commercial
vehicles and stationary industrial power units due to its reliability
and straightforward mechanical construction. It was progressively
updated to comply with Japanese emissions regulations from 1979 through
the mid-1990s, with certain variants receiving power upgrades each model
cycle. While later superseded by the 8M series engines in the early
2000s, the 8DC9 remained in production for industrial use for several
years.
Engine Family: Mitsubishi DC Series.
Configuration: 90° V8, 4-stroke diesel.
Displacement: 16.03 L (978.3 cu.in).
Bore x Stroke: 135 mm x 140 mm (5.31 in x 5.51 in).
Compression Ratio: 18.0:1.
Firing Order: 1-8-4-2-7-3-6-5.
Aspiration: Naturally Aspirated (8DC9), Turbo (8DC9-T), Twin Turbo
(8DC9-T2/T7).
Fuel System: Direct injection.
Fuel Injection Timing: 12° to 15° BTDC.
Valve Clearance (Cold - Intake): 0.50 mm (0.0197 in).
Valve Clearance (Cold - Exhaust): 0.60 mm (0.0236 in).
Maximum Power (Naturally Aspirated): 221-235 kW (300-320 hp) at 2200
rpm.
Maximum Power (Turbocharged): 265-279 kW (360-380 hp) at 2200 rpm.
Maximum Power (Twin Turbo - T2/T7): 287-328 kW (390-440 hp) at 2200 rpm.
Maximum Torque (Naturally Aspirated): 1029-1079 Nm (759-796 lb-ft) at
1400 rpm.
Maximum Torque (Turbocharged/Twin Turbo): 1275-1569 Nm (941-1157 lb-ft).
Rated Speed (Industrial/Generator): 1800-2200 rpm.
Material: Cast iron.
Configuration: 90-degree V8.
Cylinder Liners: Replaceable wet-sleeve design.
Number of Cylinders: 8.
Bore Diameter: 135 mm (5.31 in).
Main Bearings: 5 main bearing caps.
Construction: Heavy-duty cast iron block designed to withstand high
continuous loads and thermal stress in truck and stationary
applications.
Crankcase: Robust cast iron construction for structural rigidity.
Material: Aluminum alloy (per cylinder bank).
Valvetrain: Overhead valve (OHV) with pushrods and rocker arms.
Valves per Cylinder: 2 (1 intake, 1 exhaust).
Total Valves: 16.
Valve Arrangement: In-line within each cylinder head.
Cylinder Head Gasket: Composite metal construction.
System Type: Direct injection (mechanical).
Injection Pump: Inline mechanical injection pump.
Governor: Mechanical centrifugal type with variable speed control.
Injectors: Mechanical nozzle-and-holder type.
Fuel Filter: Spin-on type with integral water separator.
Fuel Type: Diesel No. 1-D or No. 2-D.
System Type: Gear-type positive displacement pump, full-flow filtration.
Oil Capacity (including filter): 28.0-32.0 L (7.4-8.5 gal).
Oil Specification: API CF-4 or higher; SAE 15W-40 or 20W-50 depending on
ambient temperature.
Oil Change Interval (industrial/truck): 250 hours or 10,000 km (6,200
miles).
Oil Pressure (Hot, Rated Speed): 300-400 kPa (43-58 psi).
Oil Filter: Full-flow spin-on element.
Oil Pan: Stamped steel construction with drain plug.
System Type: Water-cooled with centrifugal water pump.
Coolant Capacity (engine only): 12.0-14.0 L (12.7-14.8 qt).
Thermostat (Opening Temperature): 76-82°C (169-180°F).
Thermostat (Full Open): 90-95°C (194-203°F).
Coolant Specification: Ethylene glycol base, corrosion-inhibited formula
for diesel engines.
Water Pump Drive: Gear-driven or V-belt depending on chassis
configuration.
Radiator Cap Pressure: 75-105 kPa (11-15 psi).
Turbocharger (8DC9-T): Single turbocharger configuration.
Turbocharger (8DC9-T2/T7): Twin turbocharger with intercooler.
Electrical System: 24 V.
Starter Motor: 24 V / 6.0-7.0 kW.
Alternator: 24 V / 35-50 A.
Glow Plugs: 8 units (24 V) or intake air heater for cold starting.
Flywheel Housing: SAE #1 (standard for heavy truck and generator
applications).
Engine Brake: Power retarder (compression release) system available on
later variants.
Dry Weight (complete engine): 600-650 kg (1,320-1,430 lb).
Length (fan to flywheel housing): 1,200 mm (47.2 in).
Width (overall): 900 mm (35.4 in).
Height (oil pan rail to rocker cover top): 1,000 mm (39.4 in).
Oil Change Interval: 250 hours (industrial) or 10,000 km (6,200 miles).
Fuel Filter Change Interval: 500 hours or 20,000 km (12,400 miles).
Coolant Change Interval: 2,000 hours or 2 years.
Valve Lash Inspection Interval: 1,000 hours or 40,000 km (25,000 miles).
Injection Timing Check Interval: 2,000 hours.
Air Filter Service: Dry-type; replace at 500 hours.
Injection Nozzle Replacement: 4,000 hours.
Cylinder Head Bolts (M16): 285 Nm (210 lb-ft).
Cylinder Head Bolts (M14): 175 Nm (130 lb-ft).
Connecting Rod Cap Nuts: 225 Nm (166 lb-ft).
Main Bearing Cap Bolts: 370 Nm (273 lb-ft).
Flywheel to Crankshaft Bolts: 315 Nm (232 lb-ft).
Flywheel Housing to Block: 80 Nm (59 lb-ft).
Rocker Arm Shaft Bracket: 45 Nm (33 lb-ft).
Intake Manifold (M10): 25 Nm (18 lb-ft).
Exhaust Manifold (M12): 35 Nm (26 lb-ft).
Injector Hold-Down Clamp: 30 Nm (22 lb-ft).
Glow Plug: 25 Nm (18 lb-ft).
Oil Pan Drain Plug (M18): 50 Nm (37 lb-ft).
Thermostat Housing Bolts (M8): 15 Nm (11 lb-ft).
Trucks: Mitsubishi Fuso FV415, FV-R, FV-HD model codes. Mitsubishi Fuso
Super Great (early generations), The Great heavy truck range
(1983-1996).
Buses: Mitsubishi Fuso Aero Bus (MS7, MS8 series), Aero Queen (MS725
series), Aero King (MU515TA/MU525TA). MS512, MS513, MS613, MS615 series
coaches.
Generator Drive: Generac SD0350 stationary generators (350 kW standby);
60 Hz generator sets rated at 218 kW.
Industrial: Stationary power units, irrigation pumps, and construction
machinery.
Construction: Kobelco excavators and heavy equipment.
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