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Shibaura K773 Engine

General Technical Data

Engine Specifications

Engine Model ............... Shibaura K773
Engine Type ............... 4-cycle vertical inline 3-cylinder liquid-cooled diesel engine
Number of Cylinders ............... 3
Cylinder Arrangement ............... Vertical In-line
Cylinder Bore, in (mm) ............... 3.03 (77.0)
Piston Stroke, in (mm) ............... 3.15 (80.0)
Displacement, cu.in (L) ............... 68.2 (1.117)
Gross Rated Power, hp (kW) ............... 22.0 (16.4)
Rated Engine Speed, rpm ............... 2800
Maximum Low Idle Speed, rpm ............... 750-850
Maximum High Idle Speed, rpm ............... 3000-3050
Peak Net Torque, lb-ft (Nm) ............... 43.0 (58.3)
Torque Speed, rpm ............... 1600
Aspiration Type ............... Naturally Aspirated
Combustion System ............... Indirect Injection Swirl Chamber
Compression Ratio ............... 23.0:1
Firing Order ............... 1-2-3
Crankshaft Design Config ............... 3 journals integrated counterweights forged alloy steel
Main Bearing Shell Type ............... Steel backed thin-wall tri-metal lining construction
Connecting Rod Bearing Type ............... Steel backed copper-lead alloy structure
Connecting Rod Type ............... H-beam horizontal split cap configuration
Camshaft Drive Mechanism ............... Helical spur gear train mesh rotation
Camshaft Bearing Type ............... Bushing insert press-fit into cylinder block bore
Valves Configuration ............... Overhead valve setup pushrod driven actuated
Direction of Rotation ............... Counterclockwise viewed from flywheel side
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Monolithic cast iron alloy
Number of Valves per Cylinder ............... 2 (1 intake, 1 exhaust)
Total Number of Valves ............... 6
Cooling System ............... Forced circulation liquid cooling
Water Pump Construction ............... Centrifugal rotor impeller enclosed belt driven
Lubrication System ............... Full pressure feed forced lubrication
Oil Pump Config ............... Trochoid rotor type positive displacement system
Air Cleaner Type ............... Heavy duty oil bath type air filter
Crankcase Ventilation ............... Closed breather system returning gases to induction
Emission Classification ............... Tier 1 compliant regulatory status
Starting System ............... Electric glow plugs in combustion chambers
Electrical System ............... 12V or 24V
Alternator Rating ............... 15A

Fuel System

Fuel Injection Pump Model ............... Bosch inline type delivery mechanism
Fuel Feed Pump Type ............... Mechanical cam-driven diaphragm pump
Fuel Injection Nozzle Type ............... Throttle type spray pattern injector
Governor Type ............... Mechanical all-speed centrifugal governor
Fuel Injection Pump Type ............... Bosch-type inline mini pump system
Injection Nozzle Opening Pressure, Std, psi (MPa) ............... 1706-1849 (11.8-12.7)
Injection Nozzle Opening Pressure, Limit, psi (MPa) ............... 1566 (10.8)
Injection Timing Standard, degrees BTDC ............... 21-23 degrees
Injection Timing Adjustment ............... Shims variance under pump housing mounting flange
Fuel Filter Assembly Type ............... Spin-on element with water separator bowl
Fuel Specification Standard ............... ASTM D975 Diesel Fuel Number 2-D
Alternative Fuel Specification ............... DIN 51601 standard fuel oil
British Fuel Standard Compatibility ............... BS Class A-1 compliant
Fuel Injection Line Tube Diameter, in (mm) ............... 0.236 (6.00)
Fuel Injection Line Internal Diameter, in (mm) ............... 0.078 (2.00)
Fuel Return Line Configuration ............... Steel overflow pipe linked to fuel tank
Governor Regulation Percentage ............... 10 to 12 percent at max rated speed
Fuel Tank Venting Requirements ............... Atmospheric pressure cap filtration
Fuel Filter Micron Rating ............... 10 microns high efficiency filtration
Fuel Pump Cam Lift height, in (mm) ............... 0.236 (6.00)

Dimensions and Weight

Overall Length, in (mm) ............... 19.9 (505)
Overall Width, in (mm) ............... 16.9 (430)
Overall Height, in (mm) ............... 22.4 (570)
Dry Weight, lbs (kg) ............... 232 (105)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 426-455 (2.94-3.14)
Compression Pressure, Minimum, psi (MPa) ............... 355 (2.45)
Compression Pressure Between Cylinders, psi (MPa) ............... 28.4 (0.20)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-64.0 (0.29-0.44)
Oil Pressure at Idle Speed, psi (MPa) ............... 9.9 (0.06)
Thermostat Valve Opening Temperature, F (C) ............... 156-163 (69.0-73.0)
Thermostat Full Open Temperature, F (C) ............... 185 (85.0)
Radiator Pressure Cap Relief Valve, psi (MPa) ............... 12.8 (0.088)
Cooling Fan V-Belt Tension Deflection, in (mm) ............... 0.39-0.47 (10.0-12.0)
Intake Valve Lash, Cold, in (mm) ............... 0.0078 (0.200)
Exhaust Valve Lash, Cold, in (mm) ............... 0.0078 (0.200)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 5W-20
API Service Classifications ......................... CD or CE
Engine Oil Sump Capacity (High Level), qt (L) ............... 3.48 (3.30)
Engine Oil Sump Capacity (Low Level), qt (L) ............... 2.32 (2.20)
Total Engine Oil Capacity with Filter, qt (L) ............... 3.91 (3.70)
Cooling System Capacity (Engine Block), qt (L) ............... 2.11 (2.00)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 100 hours
Replace fuel filter ............... Every 200 hours
Service air filter ............... Every 50 hours
Replace air filter ............... Every 100 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 600 hours
Compression test ............... Every 800 hours
Clean radiator fin ............... Every 100 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.0314-3.0322 (77.000-77.020)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.0393 (77.200)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0019 (0.050)
Crankshaft Main Journal Diameter, in (mm) ............... 2.0452-2.0456 (51.950-51.965)
Crankshaft Main Journal Out of Round, in (mm) ............... 0.0007 (0.020)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0013-0.0033 (0.035-0.085)
Crankpin Journal Diameter, in (mm) ............... 1.7303-1.7309 (43.950-43.965)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0013-0.0033 (0.035-0.085)
Crankshaft End Play, in (mm) ............... 0.0019-0.0068 (0.050-0.175)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.8271-0.8279 (21.010-21.030)
Connecting Rod Big End Side Clearanced, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 3.0295-3.0307 (76.950-76.980)
Piston-to-Cylinder Bore Clearance, in (mm) ............... 0.0015-0.0027 (0.038-0.070)
Piston Pin Bore Inner Diameter, in (mm) ............... 0.8267-0.8271 (21.000-21.010)
Piston Pin Outer Diameter, in (mm) ............... 0.8263-0.8267 (20.990-21.000)
Piston Pin-to-Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.020)
Piston Pin-to-Small End Bushing Clearance, in (mm) ............... 0.0003-0.0015 (0.010-0.040)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0814 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0803-0.0811 (2.040-2.060)
Oil Ring Groove Width, in (mm) ............... 0.1582-0.1590 (4.020-4.040)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0007-0.0023 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Second Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Surface Distortion Flatness, in (mm) ............... 0.0019 (0.050)
Intake Valve Guide-to-Stem Clearance, in (mm) ............... 0.0011-0.0023 (0.030-0.060)
Exhaust Valve Guide-to-Stem Clearance, in (mm) ............... 0.0015-0.0027 (0.040-0.070)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2732-0.2738 (6.940-6.955)
Valve Guide Bushing Inner Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Intake Valve Face Angle, degrees ............... 45
Exhaust Valve Face Angle, degrees ............... 45
Intake Valve Seat Angle, degrees ............... 45
Exhaust Valve Seat Angle, degrees ............... 45
Intake Valve Seat Contact Width, in (mm) ............... 0.055-0.070 (1.40-1.80)
Exhaust Valve Seat Contact Width, in (mm) ............... 0.055-0.070 (1.40-1.80)
Intake Valve Recess Depth, in (mm) ............... 0.0275-0.0374 (0.700-0.950)
Exhaust Valve Recess Depth, in (mm) ............... 0.0275-0.0374 (0.700-0.950)
Valve Spring Free Length, in (mm) ............... 1.3779 (35.000)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4724 (11.980-12.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4732-0.4740 (12.020-12.040)
Rocker Arm Bushing-to-Shaft Clearance, in (mm) ............... 0.0007-0.0023 (0.020-0.060)
Camshaft Journal Outer Diameter, in (mm) ............... 1.5728-1.5736 (39.950-39.970)
Camshaft Bearing Bore Inner Diameter, in (mm) ............... 1.5748-1.5759 (40.000-40.030)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Intake Cam Lobe Height, in (mm) ............... 1.0452-1.0472 (26.550-26.600)
Exhaust Cam Lobe Height, in (mm) ............... 1.0452-1.0472 (26.550-26.600)
Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Idle Gear Shaft Outer Diameter, in (mm) ............... 0.9822-0.9830 (24.950-24.970)
Idle Gear Shaft Bushing Inner Diameter, in (mm) ............... 0.9842-0.9852 (25.000-25.025)
Idle Gear Shaft-to-Bushing Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)

Tightening Torques

Cylinder Head M10 Bolts, lb-ft (Nm) ............... 45.0 (61.0)
Cylinder Head M12 Bolts, lb-ft (Nm) ............... 70.1 (95.0)
Connecting Rod Cap Fasteners, lb-ft (Nm) ............... 18.5 to 19.9 (25.0 to 27.0)
Main Bearing Holder Assembly Bolts, lb-ft (Nm) ............... 35.4 to 39.1 (48.0 to 53.0)
Main Bearing Cap Frame Fasteners, lb-ft (Nm) ............... 35.4 to 39.1 (48.0 to 53.0)
Crankshaft Rear Seal Plate Fasteners, lb-ft (Nm) ............... 33.9 to 39.9 (46.0 to 54.0)
Flywheel Bolts, lb-ft (Nm) ............... 41.3 to 50.9 (56.0 to 69.0)
Crankshaft Front Pulley Center Nut, lb-ft (Nm) ............... 85.0 to 95.0 (115.2 to 128.8)
Camshaft Thrust Plate Screws, lb-ft (Nm) ............... 7.0 to 9.0 (9.5 to 12.2)
Camshaft Drive Gear Center Nut, lb-ft (Nm) ............... 43.0 to 51.0 (58.3 to 69.1)
Idle Gear Shaft Anchor Bolt, lb-ft (Nm) ............... 18.0 to 22.0 (24.4 to 29.8)
Rocker Shaft Support Bracket Bolts, lb-ft (Nm) ............... 20.0 to 25.0 (27.1 to 33.9)
Rocker Arm Adjusting Locknut, lb-ft (Nm) ............... 10.0 to 14.0 (13.6 to 19.0)
Rocker Cover Cap Nuts, lb-ft (Nm) ............... 6.0 to 8.0 (8.1 to 10.8)
Timing Gear Case Cover Bolts, lb-ft (Nm) ............... 14.0 to 19.0 (19.0 to 25.8)
Oil Sump Pan Flange Fasteners, lb-ft (Nm) ............... 7.0 to 10.0 (9.5 to 13.6)
Oil Sump Pan Drain Plug, lb-ft (Nm) ............... 22.0 to 29.0 (29.8 to 39.3)
Oil Pump Assembly Backing Bolts, lb-ft (Nm) ............... 6.0 to 8.0 (8.1 to 10.8)
Water Pump Body Mounting Fasteners, lb-ft (Nm) ............... 14.0 to 19.0 (19.0 to 25.8)
Cooling Fan Blade to Pulley Hub Bolts, lb-ft (Nm) ............... 7.0 to 10.0 (9.5 to 13.6)
Thermostat Housing Water Flange Bolts, lb-ft (Nm) ............... 14.0 to 19.0 (19.0 to 25.8)
Intake Manifold Mounting Fasteners, lb-ft (Nm) ............... 14.0 to 19.0 (19.0 to 25.8)
Exhaust Manifold Mounting Stud Nuts, lb-ft (Nm) ............... 18.0 to 24.0 (24.4 to 32.5)
Fuel Pump Housing Base Stud Nuts, lb-ft (Nm) ............... 15.0 to 20.0 (20.3 to 27.1)
Fuel Pump Drive Gear Hex Nut, lb-ft (Nm) ............... 30.0 to 40.0 (40.7 to 54.2)
Fuel Feed Pump Mounting Flange Nuts, lb-ft (Nm) ............... 7.0 to 10.0 (9.5 to 13.6)
Fuel Injection Nozzle Holder to Head Body, lb-ft (Nm) ............... 43.0 to 51.0 (58.3 to 69.1)
Glow Plug Body Thread Installation, lb-ft (Nm) ............... 11.0 to 15.0 (14.9 to 20.3)
Glow Plug Electrical Terminal Nuts, lb-ft (Nm) ............... 1.0 to 1.5 (1.4 to 2.0)
Oil Pressure Switch Sensor Unit, lb-ft (Nm) ............... 11.0 to 15.0 (14.9 to 20.3)
Coolant Temperature Sensor Unit, lb-ft (Nm) ............... 18.0 to 24.0 (24.4 to 32.5)
Alternator Pivot Support Anchor Bolt, lb-ft (Nm) ............... 30.0 to 40.0 (40.7 to 54.2)
Alternator Adjusting Tension Lock Bolt, lb-ft (Nm) ............... 14.0 to 19.0 (19.0 to 25.8)
Starter Motor Mounting Flange Bolts, lb-ft (Nm) ............... 35.0 to 45.0 (47.5 to 61.0)
Starter Motor Power Battery Cable Terminal, lb-ft (Nm) ............... 7.0 to 9.0 (9.5 to 12.2)
Air Breather Deflector Cover Screws, lb-ft (Nm) ............... 4.0 to 6.0 (5.4 to 8.1)
Flywheel Housing to Cylinder Block Fasteners, lb-ft (Nm) ............... 35.0 to 45.0 (47.5 to 61.0)
Oil Relief Valve Plug, lb-ft (Nm) ............... 29.0 to 36.0 (39.3 to 48.8)
Fuel Leak-off Overflow Pipe Union Nut, lb-ft (Nm) ............... 18.0 to 22.0 (24.4 to 29.8)
Injection Pump Delivery Valve Holder Fittings, lb-ft (Nm) ............... 26.0 to 32.0 (35.3 to 43.4)

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