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Mitsubishi KE75 Engine

The Mitsubishi KE75 is a compact, liquid-cooled, 2-cylinder, four-stroke overhead valve (OHV) diesel engine designed for high reliability and efficiency in small utility tractors, industrial loaders, and marine applications. Known for its durable cast-iron construction and straightforward mechanical design, this engine delivers dependable low-speed torque and operational longevity when maintained under proper schedules. It is widely deployed across agricultural machinery brands, including Shop4Trac platforms, Iseki, Bolens, and Satoh tractors.

The valve train utilizes an Overhead Valve (OHV) pushrod design featuring two valves per cylinder (one intake and one exhaust). The mechanism relies on a gear-driven camshaft inside the crankcase that acts upon mechanical lifters, pushrods, and rocker arms to actuate the valves. Valve clearance adjustments must be performed periodically on a cold engine using the adjusting screws located on the rocker arms to ensure proper compression and performance. The cylinder block features a cylinder bore of 78.0 mm (3.071 inches) and a piston stroke of 80.0 mm (3.150 inches). This configuration results in a total engine displacement of 0.8 Liters (46.6 cubic inches).

The fuel system is a mechanical direct or indirect injection system designed for diesel fuel. It comprises a fuel tank, a feed lines setup, a primary fuel filter, a dedicated 2-cylinder mechanical injection pump, and high-pressure fuel lines leading to individual injection nozzles. The injection pump relies on an internal fuel rack arm assembly to regulate fuel delivery volume relative to governor inputs. Air bleeding is required via designated vent plugs on the fuel filter assembly and the injection pump if the circuit loses pressure or undergoes servicing.

The engine uses a forced-pressure feed lubrication system driven by an internal oil pump. Oil is drawn through a strainer in the oil pan and routed through a spin-on element filter before entering the primary oil galleries to lubricate the main bearings, connecting rods, and valve train components. Engine temperature is regulated by a forced liquid-cooling system consisting of an engine-driven water pump, a cooling fan, a radiator, and a thermostat. The cooling circuit utilizes an integrated thermostat that operates at a standard opening temperature of either 76.5C or 82C.

General Technical Data

Engine Specifications

Engine Model ............... Mitsubishi KE75
Engine Type ............... 4-cycle inline 2-cylinder naturally aspirated liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 3.071 (78.0)
Engine Stroke, in (mm) ............... 3.150 (80.0)
Displacement, cu.in (L) ............... 46.6 (0.764)
Compression Ratio ............... 21.0:1-23.0:1
Rated Engine Power, hp (kW) ............... 14.8-15.0 (11.0-11.2)
Rated Engine Speed, rpm ............... 2300-2500
Max No-Load Speed, rpm ............... 2500-2700
Idle Speed, rpm ............... 700-850
Peak Torque, lb-ft (Nm) ............... 31.8-34.7 (43.1-47.1) at 1600-1800 rpm
Firing Order ............... 1-2
Direction of Rotation ............... Counter-clockwise facing flywheel
Aspiration Type ............... Naturally aspirated
Combustion Chamber ............... Swirl chamber or swirl pre-combustion chamber
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Cast iron alloy
Crankshaft Material ............... Forged steel alloy with induction hardened journals
Piston Material ............... Aluminum alloy with thermal expansion control inserts
Lubrication System ............... Forced pressure feed by trochoid gear pump
Oil Pump Drive Method ............... Gear driven directly from crankshaft
Oil Filter Type ............... Full-flow spin-on cartridge filter element
Cooling System ............... Pressurized thermo-syphon or centrifugal pump liquid circulation
Water Pump Config ............... Belt-driven centrifugal type
Cooling Fan Drive ............... V-belt drive via crankshaft pulley
Air Cleaner Type ............... Oil bath type or heavy duty dry paper element
Starting System ............... Electric starter motor mechanism
Electrical System ............... 12V
Alternator Capability, V (A) ............... 12 (15-35)

Fuel System

Injection Pump Type ............... Bosch Type M or Bosch Type P mini inline injection pump
Fuel Injection Pump Drive ............... Gear driven by engine timing gear train
Injection Nozzle Assembly Type ............... Throttle type nozzle or pintle type nozzle design
Fuel Injection Opening Pressure, psi (MPa) ............... 1706-1849 (11.8-12.7)
Static Injection Timing, deg BTDC ............... 18.0-20.0
Fuel Feed Pump Mechanism ............... Mechanical diaphragm type or gravity feed system
Fuel Filter Assembly ............... Spin-on paper cartridge element with sediment bowl
Fuel Tank Recommended ............... Diesel fuel grade no 2-D or premium winter grade
Fuel Injection Nozzle Holder Type ............... Screw-in body thread mounting assembly
Governor Type ............... Centrifugal mechanical all-speed governor
High Idle Speed Limitation, rpm ............... 2650-2750
Plunger Diameter in Injection Pump, in (mm) ............... 0.236 (6.0)
Plunger Stroke in Injection Pump, in (mm) ............... 0.275 (7.0)
Delivery Valve Opening Pressure, psi (MPa) ............... 355-426 (2.45-2.94)
Nozzle Needle Valve Diameter, in (mm) ............... 0.157 (4.0)
Nozzle Pintle Diameter, in (mm) ............... 0.039 (1.0)

Dimensions and Weight

Overall Length, in (mm) ............... 19.3-21.5 (490-545)
Overall Width, in (mm) ............... 16.5-18.1 (420-460)
Overall Height, in (mm) ............... 21.6-23.8 (550-605)
Dry Weight, lbs (kg) ............... 188-212 (85-96)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 398-426 (2.74-2.94)
Compression Pressure, Limit, psi (MPa) ............... 327 (2.25)
Compression Pressure Between Cylinders, psi (MPa) ............... 35.5 (0.245)
Oil Pressure at Low Idle, psi (MPa) ............... 14.2 (0.098)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.294-0.392)
Thermostat Start-to-Open Temperature, F (C) ............... 167-174 (75-79)
Thermostat Full-Open Temperature, F (C) ............... 194-203 (90-95)
Fan Belt Tension Deflection, in (mm) ............... 0.275-0.393 (7.0-10.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0098 (0.25)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0098 (0.25)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30W, SAE 10W-30, or 15W-40
API Service Classifications ......................... CD, CE, CF-4, or CG-4
Engine Oil Capacity, qt (L) ............... 2.75 (2.6)
Oil Capacity with Filter, qt (L) ............... 3.06 (2.9)
Cooling System Capacity, qt (L) ............... 3.17-3.70 (3.0-3.5)

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) ............... 3.0708-3.0720 (78.000-78.030)
Cylinder Bore Taper Maximum, in (mm) ............... 0.0011 (0.030)
Cylinder Block Top Surface Flatness Distortion, in (mm) ............... 0.0019 (0.050)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.050)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 1.9675-1.9685 (49.975-50.000)
Crankpin Journal Outer Diameter, in (mm) ............... 1.7706-1.7716 (44.975-45.000)
Crankshaft End Play, in (mm) ............... 0.0019-0.0070 (0.050-0.180)
Main Bearing Shell Thickness, in (mm) ............... 0.0783-0.0787 (1.990-2.000)
Main Bearing Oil Clearance, in (mm) ............... 0.0013-0.0033 (0.035-0.085)
Crankpin Bearing Oil Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9059-0.9068 (23.010-23.032)
Connecting Rod Big End Bore I.D, in (mm) ............... 1.8897-1.8905 (48.000-48.020)
Connecting Rod Axial Side Play, in (mm) ............... 0.0039-0.0098 (0.100-0.250)
Piston Skirt Outer Diameter, in (mm) ............... 3.0688-3.0700 (77.950-77.980)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0019-0.0031 (0.050-0.080)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9055-0.9061 (23.000-23.015)
Piston Pin Outer Diameter, in (mm) ............... 0.9051-0.9055 (22.990-23.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0009 (0.000-0.025)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0003-0.0016 (0.010-0.042)
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) ............... 0.0019-0.0035 (0.050-0.090)
Second Ring Side Clearance, in (mm) ............... 0.0078 (0.200)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0393 (1.000)
Oil Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3129-0.3135 (7.950-7.965)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3122-0.3129 (7.930-7.950)
Valve Guide Inside Diameter, in (mm) ............... 0.3149-0.3157 (8.000-8.018)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0026 (0.035-0.068)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0019-0.0034 (0.050-0.088)
Valve Seat Angle, deg ............... 45
Valve Face Angle, deg ............... 45
Valve Head Thickness, in (mm) ............... 0.039-0.059 (1.0-1.5)
Valve Spring Free Length, in (mm) ............... 1.614-1.653 (41.0-42.0)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.5728-1.5736 (39.950-39.970)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.5334-1.5342 (38.950-38.970)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0011-0.0033 (0.030-0.085)
Cam Lobe Height (Intake), in (mm) ............... 1.2972-1.2992 (32.950-33.000)
Cam Lobe Height (Exhaust), in (mm) ............... 1.2972-1.2992 (32.950-33.000)
Camshaft Axial End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4733 (12.000-12.022)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4712-0.4720 (11.970-11.990)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0003-0.0020 (0.010-0.052)
Tappet Valve Lifter Outer Diameter, in (mm) ............... 0.7854-0.7862 (19.950-19.970)
Tappet Cylinder Guide Hole Inside Diameter, in (mm) ............... 0.7874-0.7882 (20.000-20.021)
Tappet to Guide Hole Oil Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.071)
Crankshaft Timing Gear Backlash, in (mm) ............... 0.0019-0.0047 (0.050-0.120)
Camshaft Timing Gear Backlash, in (mm) ............... 0.0019-0.0047 (0.050-0.120)

Tightening Torques

Cylinder Head Bolts (Stage One), lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Cylinder Head Bolts (Stage Two), lb-ft (Nm) ............... 50.6-57.8 (68.6-78.4)
Cylinder Head Bolts (Stage Three), lb-ft (Nm) ............... 79.5-86.8 (107.8-117.6)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Connecting Rod Big End Cap Nuts, lb-ft (Nm) ............... 32.5-36.1 (44.1-49.0)
Flywheel Assembly Bolts Thread Lock Setup, lb-ft (Nm) ............... 61.4-68.7 (83.3-93.1)
Crankshaft Center Pulley Core Bolt, lb-ft (Nm) ............... 72.3-86.8 (98.0-117.6)
Camshaft Timing Gear Central Bolt Flange, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Rocker Arm Shaft Support Stanchion Bolts, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Valve Cover Cylinder Head Hood Capscrews, lb-ft (Nm) ............... 5.0-8.6 (6.8-11.7)
Oil Pan Perimeter Base Flange Screws, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Oil Pan Main Bottom Drainage Plug, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Timing Gear Case Cover Retaining Capscrews, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Flywheel Housing to Cylinder Block Outer Bolts, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Fuel Injection Pump Base Flange Mounting Nuts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Fuel Injection Nozzle Holder, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Fuel Delivery Line Flare Gland Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Fuel Overflow Return Pipe Banjo Core Bolt, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Glow Plug Electrical Power Cable Top Nuts, lb-ft (Nm) ............... 1.4-2.1 (2.0-3.0)
Exhaust Manifold Flange Stud Nuts, lb-ft (Nm) ............... 18.0-23.1 (24.5-31.3)
Intake Manifold Flange Face Installation Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Water Pump Assembly Mounting Shell Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Thermostat Housing Water Flange Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Oil Pressure Sensor Switch, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Coolant Temperature Sensor, lb-ft (Nm) ............... 18.0-23.1 (24.5-31.3)
Starter Motor Flange Mounting Stud Nuts, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Pivot Mount Bolt, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Oil Pump Assembly Internals Screws, lb-ft (Nm) ............... 5.7-8.6 (7.8-11.7)
Crankshaft Thrust Plate Counter-Sunk Screws, lb-ft (Nm) ............... 5.7-8.6 (7.8-11.7)
Idler Shaft Retaining Stopper Plate Bolt, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Governor Housing Assembly Flange Mounting Screws, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Decompression Lever Shaft Stop Flange Nut, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Fan Pulley to Hub Internal Carrier Hex Nuts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Air Cleaner Mounting Bracket Base Fasteners, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Fuel Filter Bracket to Engine Block Fasteners, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Breather Valve Hose Cap Clamping Screw, lb-ft (Nm) ............... 2.1-3.6 (3.0-5.0)
Oil Pressure Relief Valve Plug, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)

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• Mitsubishi Engines Specs
  
• Mitsubishi K3A Specs
  
• Mitsubishi K3B Specs
  
• Mitsubishi K3C Specs
  
• Mitsubishi K3D Specs
  
• Mitsubishi KE70 Specs
  

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