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Shibaura H843 Engine

General Technical Data

Engine Specifications

Engine Model ............... Shibaura H843
Engine Type ............... 4-cycle inline 3-cylinder liquid-cooled diesel engine
Number of Cylinders ............... 3
Cylinder Arrangement ............... Vertical inline configuration
Engine Bore, in (mm) ............... 3.31 (84.0)
Engine Stroke, in (mm) ............... 3.31 (84.0)
Displacement, cu.in (L) ............... 85.2 (1.396)
Gross Engine Power, hp (kW) ............... 22.0-27.6 (16.4-20.6)
Net Engine Power at 2700 rpm, hp (kW) ............... 26.0 (19.4)
Maximum Speed, rpm ............... 2500-2700
Peak Torque, lb-ft (Nm) ............... 55.7 (75.5)
Torque Speed, rpm ............... 1500
Low Idle Speed, rpm ............... 750-850
High Idle Speed, rpm ............... 2850-2875
Aspiration Type ............... Naturally aspirated or turbocharged variant
Combustion System ............... Swirl chamber type indirect injection
Compression Ratio ............... 23.0:1
Firing Order ............... 1-2-3
Crankshaft Rotation Direction ............... Counterclockwise looking at flywheel side
Cylinder Block Material ............... High-strength cast iron alloy
Cylinder Head Material ............... Monoblock cast iron alloy
Valves Per Cylinder ............... 2 valves (1 intake valve and 1 exhaust valve)
Lubrication System ............... Forced pressure lubrication via internal oil galleries
Oil Pump Type ............... Trochoid gear-driven mechanical pump
Oil Filter Type ............... Full-flow element cartridge spin-on mechanism
Cooling System ............... Forced liquid circulation with radiator and fan
Water Pump Type ............... Belt-driven centrifugal impeller mechanical pump
Air Cleaner Type ............... Dry element dual-stage industrial filtration
Pre-Heating System ............... Electrical sheath type glow plugs
Starting System ............... High-torque electric starter motor
Electrical System ............... 12V electrical setup
Alternator Output ............... 40-55A

Fuel System

Fuel Injection Pump Type ............... In-line Bosch type mechanical cassette injection pump
Fuel Feed Pump Type ............... Mechanical plunger diaphragm lift pump
Fuel Injection Nozzle Type ............... Throttle type pintle injector nozzle piece
Fuel Injection Pressure, psi (MPa) ............... 1991-2132 (13.7-14.7)
Fuel Injection Timing, deg BTDC ............... 18-20 degrees BTDC
Fuel Filter Type ............... Spin-on cartridge element with integrated water sedimenter
Fuel System Governor ............... Mechanical all-speed centrifugal flyweight governor
Fuel Leak-Off Pipe Type ............... Steel braided flexible rubber return line
Fuel Injector Washer Thickness, in (mm) ............... 0.039 (1.0)
Injection Pump Plunger Diameter, in (mm) ............... 0.216 (5.5)
Injection Pump Plunger Stroke, in (mm) ............... 0.275 (7.0)
Fuel Delivery Valve Opening Pressure, psi (MPa) ............... 355-426 (2.45-2.94)
Fuel System Priming Procedure ............... Manual air bleed screw configuration via lift pump lever
Fuel Line Outer Diameter, in (mm) ............... 0.236 (6.0)
Fuel Line Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Return Line Diameter, in (mm) ............... 0.157 (4.0)
Maximum Fuel Pump Inlet Vacuum, inHg (kPa) ............... 3.93 (13.3)
Maximum Fuel Return Line Backpressure, inHg (kPa) ............... 5.90 (20.0)
Fuel SpecificationRequirement ............... Ultra-low sulfur diesel ASTM D975 No. 2-D

Dimensions and Weight

Overall Length, in (mm) ............... 21.8 (555)
Overall Width, in (mm) ............... 18.7 (475)
Overall Height, in (mm) ............... 23.6 (600)
Dry Weight, lbs (kg) ............... 265 (120)
Wet Weight, lbs (kg) ............... 287 (130)

Maintenance Data

Service Information

Standard Compression Pressure, psi (MPa) ............... 426 (2.94)
Minimum Compression Pressure, psi (MPa) ............... 355 (2.45)
Compression Variation Between Cylinders, psi (MPa) ............... 28.4 (0.196)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.6-56.8 (294-392)
Oil Pressure at Low Idle Speed, psi (kPa) ............... 9.9-14.2 (68.6-98.0)
Relief Valve Opening Pressure, psi (kPa) ............... 56.8-71.1 (392-490)
Thermostat Valve Opening Temperature, F (C) ............... 169-176 (76-80)
Thermostat Full Open Temperature, F (C) ............... 194 (90)
Radiator Cap Pressure Rating, psi (kPa) ............... 12.8 (88.2)
Maximum Allowable Coolant Temperature, F (C) ............... 221 (105)
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 15W-40
API Service Classifications ......................... CH-4 or CI-4
Engine Oil Capacity with Filter, qts (L) ............... 5.6 (5.3)
Engine Oil Capacity (Dry Engine), qts (L) ............... 6.1 (5.8)
Cooling System Capacity, qts (L) ............... 4.2 (4.0)

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 400 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) ............... 3.3070-3.3082 (84.000-84.030)
Cylinder Bore I.D Maximum Wear Limit, in (mm) ............... 3.3150 (84.200)
Cylinder Bore Maximum Roundness, in (mm) ............... 0.00078 (0.020)
Cylinder Block Upper Deck Surface Flatness, in (mm) ............... 0.0019 (0.05)
Cylinder Liner Out-of-Roundness, in (mm) ............... 0.0011 (0.03)
Main Bearing Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.958-67.970)
Main Bearing Oil Clearance, in (mm) ............... 0.0015-0.0033 (0.040-0.085)
Crankpin Journal Diameter, in (mm) ............... 2.0458-2.0462 (51.964-51.975)
Crankpin Bearing Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft Journal Thrust Clearance, in (mm) ............... 0.0019-0.0068 (0.050-0.175)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1031-1.1038 (28.020-28.038)
Connecting Rod Big End Bore Diameter, in (mm) ............... 2.1653-2.1659 (55.000-55.015)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 3.3043-3.3055 (83.930-83.960)
Piston-to-Cylinder Bore Clearance, in (mm) ............... 0.0015-0.0039 (0.040-0.100)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1024-1.1027 (28.002-28.008)
Piston Pin Outer Diameter, in (mm) ............... 1.1020-1.1023 (27.992-28.000)
Piston Pin-to-Piston Pin Bore Clearance, in (mm) ............... 0.00007-0.00062 (0.002-0.016)
Piston Pin-to-Small End Bushing Clearance, in (mm) ............... 0.00039-0.00181 (0.010-0.046)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0590-0.0598 (1.500-1.520)
Oil Ring Groove Width, in (mm) ............... 0.1181-0.1189 (3.000-3.020)
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) ............... 0.0007-0.0027 (0.020-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.050)
Cylinder Head Gasket Thickness, in (mm) ............... 0.0472-0.0511 (1.20-1.30)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2738-0.2744 (6.955-6.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2724-0.2732 (6.940-6.955)
Intake Valve Stem-to-Guide Clearance, in (mm) ............... 0.0011-0.0023 (0.030-0.060)
Exhaust Valve Stem-to-Guide Clearance, in (mm) ............... 0.0017-0.0029 (0.045-0.075)
Valve Spring Free Length, in (mm) ............... 1.3779 (35.00)
Valve Head Depth, in (mm) ............... 0.0275-0.0374 (0.700-0.950)
Valve Seat Angle, deg ............... 45
Valve Seat Contact Width, in (mm) ............... 0.0590-0.0826 (1.500-2.100)
Camshaft Journal Outer Diameter, in (mm) ............... 1.7692-1.7700 (44.940-44.960)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0015-0.0043 (0.040-0.110)
Intake Cam Lobe Height, in (mm) ............... 1.3409-1.3433 (34.060-34.120)
Exhaust Cam Lobe Height, in (mm) ............... 1.3409-1.3433 (34.060-34.120)
Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4722 (11.982-11.995)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm Bushing-to-Shaft Clearance, in (mm) ............... 0.00019-0.00141 (0.005-0.036)
Tappet Valve Lifter Outer Diameter, in (mm) ............... 0.4716-0.4721 (11.982-11.993)
Tappet Lifter Bore Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Tappet Lifter-to-Bore Clearance, in (mm) ............... 0.00027-0.00141 (0.007-0.036)

Tightening Torques

Cylinder Head Main Fasteners, lb-ft (Nm) ............... 36.0-39.0 (49.0-53.0)
Cylinder Head Small Nuts, lb-ft (Nm) ............... 44.0-48.0 (59.6-65.0)
Cylinder Head Large Nuts, lb-ft (Nm) ............... 111.0-114.0 (150.5-154.5)
Crankshaft Main Bearing Cap Bolts, lb-ft (Nm) ............... 36.0-39.0 (49.0-53.0)
Connecting Rod Big End Cap Nuts, lb-ft (Nm) ............... 32.0-36.0 (43.4-48.8)
Crankshaft Main Bearing Case Bolts, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Crankshaft Large Front Pulley Nut, lb-ft (Nm) ............... 200.0-220.0 (271.0-298.0)
Flywheel-to-Crankshaft Rear Flange Bolts, lb-ft (Nm) ............... 51.0-58.0 (69.0-78.5)
Flywheel Housing-to-Cylinder Block Bolts, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Rocker Arm Shaft Bracket Support Bolts, lb-ft (Nm) ............... 20.0-25.0 (27.0-34.0)
Valve Timing Gear Case Cover Plate Bolts, lb-ft (Nm) ............... 14.0-18.0 (19.0-24.5)
Camshaft Thrust Gear Hex Flange Bolt, lb-ft (Nm) ............... 43.0-51.0 (58.0-69.0)
Oil Pan Fluid Basin Bottom Mounting Bolts, lb-ft (Nm) ............... 8.0-11.0 (11.0-15.0)
Oil Pan Drain Hex Nut Bolt Plug, lb-ft (Nm) ............... 25.0-33.0 (34.0-45.0)
Fuel Pump Cassette Mounting Nuts, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.5)
Fuel Injector Assembly Outer Fitting Nut, lb-ft (Nm) ............... 43.0-51.0 (58.0-69.0)
Fuel High-Pressure Delivery Line Union Nut, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Fuel Injector Leak-Off Return Line Banjo Bolt, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Water Pump Assembly Body Housing Fasteners, lb-ft (Nm) ............... 14.0-18.0 (19.0-24.5)
Thermostat Housing Water Cap Bolts, lb-ft (Nm) ............... 14.0-18.0 (19.0-24.5)
Intake Manifold Air Supply Plenum Fasteners, lb-ft (Nm) ............... 14.0-18.0 (19.0-24.5)
Exhaust Manifold Collector Flange Fasteners, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Oil Pressure Sensor Indicator Switch, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Glow Plug Electrical Sheath Heating Unit, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.5)
Electric Starter Motor Flange Mounting Bolts, lb-ft (Nm) ............... 35.0-47.0 (47.5-63.5)
Alternator Pivot Mount Long Assembly Fastener, lb-ft (Nm) ............... 30.0-40.0 (40.5-54.0)
Alternator Adjusting Tension Plate Bolt, lb-ft (Nm) ............... 14.0-18.0 (19.0-24.5)
Cylinder Head Valve Rocker Cover Center Nuts, lb-ft (Nm) ............... 5.0-8.0 (6.8-11.0)
Crankcase Breather Assembly Top Cap Screws, lb-ft (Nm) ............... 4.0-6.0 (5.4-8.0)
Fuel Feed Lift Pump Mounting Screws, lb-ft (Nm) ............... 6.0-9.0 (8.0-12.0)
Cooling Fan Blade-to-Pulley Hub Bolts, lb-ft (Nm) ............... 7.0-10.0 (9.5-13.5)
Oil Pump Base Internal Cover Screws, lb-ft (Nm) ............... 6.0-8.0 (8.0-11.0)
Idler Gear Shaft Anchor Bolt, lb-ft (Nm) ............... 20.0-25.0 (27.0-34.0)
Cylinder Head Core Expansion Plug, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)

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