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Mitsubishi KE70 Engine

The Mitsubishi KE70 is a compact, vertical, 2-cylinder, liquid-cooled, four-stroke diesel engine designed for heavy-duty agricultural and industrial applications. It is famously utilized as the primary power plant in compact utility tractors, including models like the Iseki TX1300 and TX1500 series as well as the Mitsubishi D1300. Known for its high low-end torque, reliability, and robust mechanical construction, this engine series requires basic and periodic preventative maintenance to optimize internal service limits and performance longevity.

Valve Configuration: Overhead valve (OHV) arrangement operated via a gear-driven camshaft, pushrods, and rocker shaft assembly. There are 2 valves per cylinder (1 intake, 1 exhaust). Bore and Stroke: The cylinder configuration features a bore diameter of 73 mm (2.87 inches) and a piston stroke length of 80 mm (3.15 inches). Total engine displacement measures 40.8 cubic inches (0.7 Liters). The calculated compression ratio is 20:1.

Fuel System: Mechanical indirect diesel injection system utilizing a multi-plunger inline injection pump assembly. Fuel delivery from the main tank passes through a primary cartridge filter to prevent internal pump contamination. The high-pressure lines deliver fuel to specialized pintle or multi-hole injection nozzles mounted inside pre-combustion chambers. The combustion timing sequence follows a strict 1-2 cylinder firing order.

Lubrication System: Forced-feed circulation schema driven by an internal trochoid-type oil pump. Oil is drawn through a submersed screen strainer in the oil pan and pushed through a spin-on full-flow oil filter. Recommended fluid viscosity ratings are SAE 10W30 or 15W40 depending on operational temperatures. Cooling System: Closed, forced liquid-cooled circuit using an engine-driven water pump and an external cooling fan assembly. System protection includes a factory thermo switch that trips warning or safety protocols between 103C and 111C.

General Technical Data

Engine Specifications

Engine Model ............... Mitsubishi KE70
Engine Type ............... 4-cycle inline 2-cylinder overhead valve liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... In-line vertical
Engine Bore, in (mm) ............... 2.874 (73.0)
Engine Stroke, in (mm) ............... 3.150 (80.0)
Displacement, cu.in (L) ............... 40.82 (0.669)
Gross Power, hp (kW) ............... 13.0-15.0 (9.7-11.2)
Rated Speed, rpm ............... 2700-2800
Maximum Idle Speed, rpm ............... 2900-3000
Minimum Idle Speed, rpm ............... 850-900
Peak Torque, lb-ft (Nm) ............... 28.5-31.0 (38.6-42.0) at 1900-2100 rpm
Aspiration Type ............... Naturally aspirated
Compression Ratio ............... 20.0:1
Firing Order ............... 1-2
Valvetrain Layout ............... Overhead valve pushrod actuated config
Number of Valves per Cylinder ............... 2
Main Bearing Shell Type ............... Steel-backed tri-metal precision inserts
Camshaft Drive Method ............... Direct spur gear drive train
Cylinder Block Material ............... High-strength cast iron alloy
Cylinder Head Material ............... Dense cast iron alloy
Combustion Chamber ............... Swirl chamber type pre-combustion system
Lubrication System ............... Full-pressure forced feed lubrication
Oil Pump Configuration ............... Trochoid type gear-driven pump
Oil Filter Type ............... Full-flow, replaceable element spin-on canister
Cooling System ............... Forced circulation thermo-siphon liquid cooled
Water Pump Type ............... Belt-driven centrifugal type impeller pump
Cooling Fan Drive ............... V-belt pulley mechanical drive via crankshaft
Air Cleaner Type ............... Dry element paper type filtration system
Starting System ............... Electric starter motor
Electrical System Potential ............... 12V

Fuel System

Injection Pump Model ............... Bosch Type ND-PFR mini in-line multi-plunger
Injection Pump Drive ............... Internal camshaft lobe drive off engine gear train
Injection Nozzle Type ............... Throttle type pin-nozzle design
Nozzle Holder Model ............... Bosch Type ND-KCA assembly flange
Nozzle Valve Opening Pressure, psi (bar) ............... 1706.0-1849.0 (118.0-128.0)
Fuel Delivery Pressure, psi (bar) ............... 2.84-4.26 (0.20-0.30)
Injection Timing Angle, deg BTDC ............... 18.0-20.0
Fuel Feed Pump Type ............... Mechanical diaphragm lift pump or gravity feed
Fuel Filter Mechanism ............... Paper cartridge corrugated flow-through design
Fuel Filter Capacity, gpm (L/min) ............... 0.26 (1.0)
Plunger Diameter, in (mm) ............... 0.216 (5.5)
Plunger Stroke, in (mm) ............... 0.275 (7.0)
Delivery Valve Opening Pressure, psi (bar) ............... 426.0 (29.4)
Nozzle Orifice Size, in (mm) ............... 0.039 (1.0)
Nozzle Pintle Clearance, in (mm) ............... 0.0007-0.0015 (0.018-0.038)
Injection Line Inner Diameter, in (mm) ............... 0.059 (1.5)
Injection Line Outer Diameter, in (mm) ............... 0.236 (6.0)
Injection Line Length, in (mm) ............... 15.74 (400.0)
Governor Type ............... Centrifugal mechanical all-speed governor
Governor Rack Travel Limit, in (mm) ............... 0.354 (9.0)
Fuel Transfer Pump Static Pressure, psi (bar) ............... 5.68 (0.39)
Fuel Line Hose Core Material ............... Nitrile butadiene rubber compound
Fuel Line Hose Armor Shielding ............... Braided high-tensile fabric casing
Fuel Water Separator Type ............... Transparent sediment bowl with float ring

Dimensions and Weight

Overall Length, in (mm) ............... 18.1 (460)
Overall Width, in (mm) ............... 16.5 (420)
Overall Height, in (mm) ............... 21.6 (550)
Dry Weight, lbs (kg) ............... 166 (75)
Operating Weight, lbs (kg) ............... 181 (82)

Maintenance Data

Service Information

Cylinder Compression Pressure, Standard, psi (bar) ............... 426.0 (29.4)
Cylinder Compression Pressure, Wear Limit, psi (bar) ............... 341.0 (23.5)
Maximum Compression Between Cylinders, psi (bar) ............... 28.4 (1.96)
Radiator Cap Pressure, psi (bar) ............... 12.8 (0.88)
Oil Pressure at Rated Speed, psi (bar) ............... 35.5-56.8 (2.45-3.92)
Oil Pressure at Idle Speed, psi (bar) ............... 11.3 (0.78)
Maximum Permissible Oil Temperature, F (C) ............... 230.0 (110.0)
Maximum Coolant Exhaust Temperature, F (C) ............... 203.0 (95.0)
Thermostat Opening Temp, F (C) ............... 160.0 (71.0)
Thermostat Full Open Temp, F (C) ............... 185.0 (85.0)
Fan Belt Deflection Tension, in (mm) ............... 0.393-0.472 (10.0-12.0)
Intake ValveClearance, Cold, in (mm) ............... 0.0138 (0.351)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0138 (0.351)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30W, SAE 10W-30, or 15W-40
API Service Classifications ......................... CC or CD
Engine Oil Capacity, qts (L) ............... 3.20 (3.0)
Cooling System Capacity, qts (L) ............... 4.43 (4.2)

Service Intervals

Change oil and filter ............... Every 100 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 400 hours
Replace fuel filter ............... Every 200 hours
Valve clearance adjustment ............... Every 200 hours
Fuel system inspection ............... Every 400 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 600 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 2.874 (73.00)
Cylinder Bore Maximum Out-of-Round, in (mm) ............... 0.0059 (0.150)
Crankshaft Main Journal Diameter, in (mm) ............... 1.9685 (50.000)
Crankshaft Main Journal Taper, in (mm) ............... 0.0011 (0.030)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0013-0.0033 (0.035-0.085)
Crankpin Journal Diameter, in (mm) ............... 1.6535 (42.000)
Crankpin Bearing Oil Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Crankshaft End Play, in (mm) ............... 0.0019-0.0068 (0.050-0.175)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.7484-0.7492 (19.010-19.030)
Connecting Rod Small End Bushing Clearance, in (mm) ............... 0.0003-0.0015 (0.010-0.040)
Connecting Rod Big End Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outside Diameter, in (mm) ............... 2.871 (77.92)
Piston-to-Cylinder Wall Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.7480-0.7484 (19.000-19.010)
Piston Pin Outside Diameter, in (mm) ............... 0.7476-0.7480 (18.990-19.000)
Piston Pin-to-Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.020)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1574-0.1582 (4.000-4.020)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0059-0.0137 (0.150-0.350)
Second Ring End Gapd, in (mm) ............... 0.0059-0.0137 (0.150-0.350)
Oil Ring End Gap, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Cylinder Head Flatness Distortion, in (mm) ............... 0.0019 (0.050)
Cylinder Block Upper Deck Flatness Distortion, in (mm) ............... 0.0019 (0.050)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2716-0.2724 (6.900-6.920)
Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.020)
Intake Valve Stem-to-Guide Clearance, in (mm) ............... 0.0013-0.0027 (0.035-0.070)
Exhaust Valve Stem-to-Guide Clearance, in (mm) ............... 0.0031-0.0047 (0.080-0.120)
Valve Margin Thickness, in (mm) ............... 0.0393 (1.000)
Valve Face Seating Angle, deg ............... 45.0
Valve Seat Contact Width, in (mm) ............... 0.0472-0.0590 (1.200-1.500)
Valve Spring Free Lenght, in (mm) ............... 1.4960 (38.000)
Camshaft Journal Diameter (Front), in (mm) ............... 1.5748 (40.000)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.5748 (40.000)
Camshaft Journal-to-Bore Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Intake Cam Lobe Height, in (mm) ............... 1.3188 (33.500)
Exhaust Cam Lobe Height, in (mm) ............... 1.3188 (33.500)
Camshaft Axial End Pla, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4724 (11.980-12.000)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.4728-0.4740 (12.010-12.040)
Rocker Arm Bushing-to-Shaft Clearance, in (mm) ............... 0.0003-0.0023 (0.010-0.060)
Tappet Lifter Outer Diameter, in (mm) ............... 0.7460-0.7468 (18.950-18.970)
Tappet Guide Bore Inside Diameter, in (mm) ............... 0.7480-0.7488 (19.000-19.020)
Tappet-to-Guide Bore Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)

Tightening Torques

Cylinder Head Structural Fastener Bolts, lb-ft (Nm) ............... 54.2-57.8 (73.5-78.4)
Connecting Rod Bearing Cap Nuts, lb-ft (Nm) ............... 23.1-25.3 (31.4-34.3)
Main Bearing Housing Cap Retaining Bolts, lb-ft (Nm) ............... 36.1-39.7 (49.0-53.9)
Flywheel Retention Hub Flange Bolts, lb-ft (Nm) ............... 43.4-47.0 (58.8-63.7)
Crankshaft Front Pulley Snout Nut, lb-ft (Nm) ............... 72.3-79.5 (98.0-107.8)
Camshaft Thrust Retaining Plate Bolts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Rocker Arm Shaft Support Bracket Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Valve Lash Adjuster Nut Locknut, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Timing Gear Outer Cover Shell Bolts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Oil Pan Perimeter Retention Screws, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Oil Pan Sump Base Drain Plug, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Fuel Injection Pump Housing Flange Nuts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Fuel Injection Nozzle Holder Assembly, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Injection Delivery Line Union Gland Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Fuel Overflow Banjo Bolt Connection Fitting, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Glow Plug Terminal Hex Nuts into Head, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Glow Plug Current Busbar Power Link Nuts, lb-ft (Nm) ............... 1.4-2.1 (2.0-3.0)
Water Pump Backing Housing Plate Bolts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Cooling Fan Blade Bracket Spindle Bolts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Thermostat Housing Top Outlet Neck Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Intake Manifold Flange Fastener Bolts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Exhaust Manifold Flange Fastener Nuts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Starter Motor Structural Flange Mounting Bolts, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Dynamo Swivel Tension Bracket Assembly Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Oil Pressure Switch Indicator Sensor Body, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Water Temperature Sender Unit Core Thread, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Crankcase Oil Strainer Intake Pipe Flange, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Idler Gear Spindle Shaft Retaining Screw, lb-ft (Nm) ............... 21.6-25.3 (29.4-34.3)
Flywheel Housing Shell to Block Bolts, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Valve Mechanism Rocker Arm Cover Center Nuts, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Fuel Filter Mounting Bracket Frame Bolts, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Air Cleaner Mounting Strap Retaining Studs, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Exhaust Pipe Muffler Connection Joint Nuts, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Breather Baffle Deflector Cover Internal Screws, lb-ft (Nm) ............... 2.1-3.6 (3.0-5.0)
Main Bearing Case Side Lock Bolts, lb-ft (Nm) ............... 21.6-25.3 (29.4-34.3)
Injection Pump Delivery Valve Retaining Holder, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Injection Pump Control Rack Alignment Pin Screw, lb-ft (Nm) ............... 5.0-6.5 (6.8-8.8)
Governor Housing Cover Plate Fastening Screws, lb-ft (Nm) ............... 3.6-5.0 (5.0-6.8)
Governor Weight Assembly Retaining Shaft Nut, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Crankcase Breathing Tube Deflector Flange Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Speed Control Lever Friction Adjustment Nut, lb-ft (Nm) ............... 3.6-5.0 (5.0-6.8)
Oil Pump Cover Plate Internal Hex Screws, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Fuel Lift Pump Mechanical Flange Mount Nuts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Radiator Core Support Frame Grounding Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Alternator Pulley Shaft Core Securing Nut, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Starter Solenoid Electrical Power Cable Nut, lb-ft (Nm) ............... 7.2-9.4 (9.8-12.7)
Front Engine Support Structural Foot Bracket, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Rear Engine Support Adapter Plate Mounts, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)

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• Mitsubishi Engines Specs
  
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• Mitsubishi K3D Specs
  
• Mitsubishi KE75 Specs
  

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