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Mitsubishi S3L Engine

General Technical Data

Mitsubishi S3L Engine Specifications

Engine Model ............... Mitsubishi S3L
Engine Type ............... 4-cycle, water-cooled, vertical, overhead valve, diesel
Number of Cylinders ............... 3
Displacement, L (cu.in) ............... 1.125 (68.75)
Engine Bore, mm (in) ............... 78.0 (3.07)
Engine Stroke, mm (in) ............... 78.5 (3.09)
Aspiration ............... Natural
Maximum Engine Power, hp (kW) ............... 22.0 (16.3)
Rated Engine Speed, rpm ............... 2700
Compression ............... 22:1
Firing Order ............... 1-3-2
Inlet Valve Timing (Open/Close), deg ............... 15 BTDC / 41 ABDC
Exhaust Valve Timing (Open/Close), deg ............... 54 BBDC / 10 ATDC
Direction of Rotation ............... Counterclockwise when viewed from the flywheel end

Fuel System

Fuel System ............... Indirect Injection
Fuel Pump Type ............... Electro-magnetic Diaphram Type
Injection Pump Type ............... Bosch M-type
Injection Nozzle Opening Pressure, kPa (psi) ............... 14220-15000 kPa (2062-2176)
Fuel Injection Timing (BTDC), deg ............... 17
Governor ............... Centrifugal fly-weight type
Fuel Filter Type ............... Paper-element cartridge
Air Cleaner Type ............... Paper element
Fuel Tank Capacity, L (gal) ............... 25.0 (6.5)

Lubrication System

Lubrication System ............... Forced circulation (pressure feed by trochoid pump)
Oil Pump ............... Gear type
Oil Pump Displacement, L (gal) ............... 18.0 (4.8)
Relief Valve Type ............... Piston valve
Relief Valve Pressure, kPa (psi) ............... 35 (51)
Oil Filter Type ............... Spin-on paper element

Cooling System

Cooling System ............... Water-cooled, forced circulation
Water Pump ............... Centrifugal Type
Water Pump Displacement, L (gal) ............... 30.0 (8.0)
Thermostat Opening Temperature, C (F) ............... 82 (180)
Cooling Fan Type ............... Pusher suction
Fan Blades Diameter, mm (in) ............... 340 (13.4)
Coolant Capacity, L (qts) ............... 1.8 (1.9)

Electrical System

Electrical System Rating, Volts ............... 12, Negative Ground
Charging System ............... Alternator
Alternator Rating, Amp ............... 50
Starter Rating ............... 12V-1.7kW
Glow Plug Type ............... Sheathed plug

Dimensions

Length, mm (in) ............... 536 (21.1)
Width, mm (in) ............... 433 (17.1)
Height, mm (in) ............... 572 (22.5)
Net weight, kg (lbs) ............... 135.0 (298)

Mitsubishi S3L Maintenance Data

Engine Oil

Engine Oil Type (Summer) ............... SAE 15W-40
Engine Oil Type (Winter) ............... SAE 5W-20, 10W-30
Oil Classification ............... API CD or CF
Oil Capacity, L (qts) ............... 3.7 (3.9)

Cylinder Block and Valves

Cylinder Bore (Maximum), mm (in) ............... 78.08 (3.0862)
Compression Pressure, kPa (psi) ............... 2900 (421)
Inlet Valve Clearance, mm (in) ............... 0.25 (0.01)
Exhaust Valve Clearance, mm (in) ............... 0.25 (0.01)

Service Intervals

Clean Fuel Filter Element ............... Every 100 hours
Change Engine Oil ............... Every 250 hours
Change Oil Filter ............... Every 250 hours
Change Fuel Filter Element ............... Every 500 hours
Check and Adjust Injection Pressure ............... Every 500 hours
Check and Adjust Valve Clearance ............... Every 500 hours

Mitsubishi S3L Service Specifications

Cylinder Block

Cylinder Push Rod Bend, mm (in) ............... 0.3 (0.011)
Cylinder Head Bottom Face Distortion, mm (in) ............... 0.05-0.10 (0.002-0.004)
Cylinder Block Top Face Distortion, mm (in) ............... 0.05-0.10 (0.002-0.004)
Cylinder Bore (Wear Limit), mm (in) ............... 78.2 (3.08)
Rocker Arm Inside Diameter, mm (in) ............... 18.910-18.930 (0.7450-0.7458)
Rocker Shaft Diameter, mm (in) ............... 18.880-18.898 (0.7438-0.7445)
Rocker Arm to Shaft Clearance, mm (in) ............... 0.012-0.050 (0.0004-0.0019)
Connecting Rod Bend, mm (in) ............... 0.05/100 (0.002/3.940)
Connecting Rod End Play, mm (in) ............... 0.10-0.35 (0.004-0.014)
Crankshaft Journal Diameter, mm (in) ............... 51.985-52.000 (2.0482-2.0488)
Crank Pin Diameter, mm (in) ............... 47.950-47.964 (1.8892-1.8897)
Crankshaft Bend, mm (in) ............... 0.025 (0.0010)
Crankshaft Main Bearings Oil Clearance, mm (in) ............... 0.030-0.077 (0.0012-0.0030)
Connecting Rod Bearings Oil Clearance, mm (in) ............... 0.025-0.072 (0.0010-0.0028)
Crankshaft End Play, mm (in) ............... 0.050-0.175 (0.0020-0.0069)
Camshaft Cam Height, mm (in) ............... 35.720 (1.4073)
Tappet to Guide Clearance, mm (in) ............... 0.150 (0.0059)
Camshaft Journal to Bushing Clearance, mm (in) ............... 0.050-0.125 (0.0020-0.0049)
Idler Gear to shaft Clearance, mm (in) ............... 0.020-0.070 (0.0008-0.0028)

Valves

Valve Stem Diameter (Inlet) ............... 6.565-6.580 (0.2586-0.2592)
Valve Stem Diameter (Exhaust) ............... 6.530-6.550 (0.2572-0.2580)
Valve Guide Inside Diameter (Inlet), mm (in) ............... 6.600-6.615 (0.2600-0.2606)
Valve Guide Inside Diameter (Exhaust), mm (in) ............... 6.600-6.615 (0.2600-0.2606)
Valve Stem to Guide Clearance (Inlet), mm (in) ............... 0.020-0.050 (0.0008-0.0020)
Valve Stem to Guide Clearance (Exhaust), mm (in) ............... 0.050-0.085 (0.0020-0.0033)
Valve Seat Angle, deg ............... 45
Valve Seat Width, mm (in) ............... 1.30-1.80 (0.0512-0.0709)
Valve Spring Free Length, mm (in) ............... 47 (1.85)

Piston and Piston Rings

Piston Diameter (Std), mm (in) ............... 77.93-77.95 (3.070-3.071)
Piston Diameter (0.25mm Oversize), mm (in) ............... 78.18-78.20 (3.080-3.081)
Piston Diameter (0.25mm Oversize), mm (in) ............... 78.43-78.45 (3.090-3.090)
Piston Pin Diameter, mm (in) ............... 22.944-23.000 (0.9039-0.9062)
Piston Pin to Boss Clearance, mm (in) ............... 0.006-0.018 (0.0002-0.0007)
Piston to Cylinder Clearance, mm (in) ............... 0.035-0.086 (0.0014-0.0034)
Top Compression Ring Groove Clearance, mm (in) ............... 0.09-0.11 (0.0035-0.0043)
Second Compression Ring Groove Clearance, mm (in) ............... 0.07-0.11 (0.0028-0.0043)
Oil Ring Groove Clearance, mm (in) ............... 0.03-0.07 (0.0012-0.0028)
Piston Ring Gap (Top Compression Ring), mm (in) ............... 0.15-0.30 (0.006-0.012)
Piston Ring Gap (Second Compression Ring), mm (in) ............... 0.15-0.30 (0.006-0.012)
Piston Ring Gap (Oil Ring), mm (in) ............... 0.20-0.40 (0.008-0.016)

Mitsubishi S3L Tightening Torque Specs

Cylinder head bolt (M10x1.75), Nm (ft-lb) ............... 83.4-93.2 (61.5-68.7)
Rocker cover bolt (M8x1.25), Nm (ft-lb) ............... 9.81-12.7 (7.2-9.4)
Rocker shaft bracket bolt (M8x1.25), Nm (ft-lb) ............... 9.81-19.6 (7.2-14.5)
Thrust plate bolt (M8x1.25), Nm (ft-lb) ............... 9.8-11.8 (7.2-8.7)
Main bearing cap bolt (M10x1.25), Nm (ft-lb) ............... 49.0-53.9 (36.2-39.8)
Connecting rod cap nut (M9x1.0), Nm (ft-lb) ............... 32.4-37.3 (23.9-27.5)
Flywheel bolt (M12x1.25), Nm (ft-lb) ............... 127-137 (94.0-101.3)
Crankshaft pulley nut (M18x1.5), Nm (ft-lb) ............... 147-196 (108.5-144.6)
Rear plate mounting bolt (M12x1.25), Nm (ft-lb) ............... 53.9-73.5 (39.8-54.2)
Nozzle retaining nut (M16x0.75), Nm (ft-lb) ............... 34.3-39.2 (25.3-28.9)
Nozzle holder (M20x1.5), Nm (ft-lb) ............... 49.0-58.8 (36.2-43.4)
Fuel injection pipe nut (M12x1.5), Nm (ft-lb) ............... 24.5-34.3 (18.1-25.3)
Oil relief valve (M22x1.5), Nm (ft-lb) ............... 44.1-53.9 (32.5-39.8)
Oil pan drain plug (M14x1.5), Nm (ft-lb) ............... 34.3-44.1 (25.3-32.5)
Oil filter (M20x1.5), Nm (ft-lb) ............... 10.8-12.7 (8.0-9.4)
Inlet cover bolt (M8x1.25), Nm (ft-lb) ............... 14.7-21.6 (10.8-15.9)
Exhaust manifold bolt (M8x1.25), Nm (ft-lb) ............... 14.7-21.6 (10.8-15.9)