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Shibaura J823 Engine

The Shibaura J823 is a heavy-duty, vertical, inline three-cylinder, 4-stroke diesel engine designed primarily for compact agricultural tractors, commercial lawn mowers, and light industrial machinery. Engineered for high structural integrity and thermal stability, it is famously utilized in commercial equipment applications such as the Ford New Holland 1320 compact utility tractor. The block configuration features a reliable cast-iron design intended for sustained high-load applications, high durability, and close mechanical compatibility with comparable small-displacement Perkins industrial power units.

Valve Configuration: Overhead Valve (OHV) arrangement operated via a gear-driven camshaft, pushrods, and rocker-arm assemblies. Valves per cylinder: Two valves per cylinder (one intake, one exhaust) totaling six valves across the engine head assembly. Cylinder Bore: 82 mm (3.22 inches) nominal cylinder bore diameter. Piston Stroke: 80 mm (3.15 inches) total piston stroke. Total Engine Displacement: 1.267 Liters (77.3 cubic inches) across all three combustion chambers.

Fuel System: Mechanical indirect injection diesel system with a pre-combustion chamber design. Fuel delivery: Fuel is drawn from the supply tank via a mechanical diaphragmatic or electric fuel lift pump through a primary fuel filter element to eliminate water and fine contaminants. Injection pump: High-pressure inline multi-plunger injection pump timed directly to the engine gear train, distributing metered high-pressure diesel lines to individual mechanical fuel injectors mounted in the cylinder head.

Lubrication System: Full pressure feed lubrication system driven via a trochoid or internal-gear type oil pump. Filtration: Single spin-on full-flow oil filter assembly alongside a coarse screen filter on the oil pump pickup tube. Oil path: Oil pressure is channeled from the oil pan through the main oil gallery to provide direct lubrication to the crankshaft main bearings, connecting rod journals, piston pins, and overhead rocker mechanism. Cooling System: Liquid-cooled forced circulation system utilizing an antifreeze or water mixture. Circulation: Engine block and cylinder head coolant passages are charged by a belt-driven, centrifugal-type water pump. Temperature control: Regulated by a wax-pellet type bypass thermostat designed to monitor core temperature and divert coolant flow to a heavy-duty finned radiator system for auxiliary heat dissipation.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura J823
Engine Type ............... 4-cycle vertical inline 3-cylinder liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.22 (82.0)
Engine Stroke, in (mm) ............... 3.15 (80.0)
Displacement, cu.in (L) ............... 77.3 (1.267)
Gross Engine Power, hp (kW) ............... 20.0-25.0 (14.9-18.6) at 2500-3000 rpm
Net Engine Power, hp (kW) ............... 19.0 (14.2) at 2500 rpm
Rated Engine Speed, rpm ............... 2500-3000
Peak Torque, lb-ft (Nm) ............... 44.2-51.6 (60.0-70.0) at 1800-2000 rpm
Low Idle Speed, rpm ............... 800-900
High Idle Speed, rpm ............... 2700-3150
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 22.0:1-23.5:1
Firing Order ............... 1-2-3
Rotation Direction ............... Counterclockwise from flywheel side
Combustion Chamber ............... Swirl chamber type or indirect injection
Camshaft Drive Type ............... Helical gear train system linkage
Cylinder Block Material ............... Cast iron
Cylinder Head Material ............... Cast iron
Lubrication System ............... Full-pressure forced lubrication feed
Oil Pump Type ............... Trochoid type gear-driven assembly
Oil Filter Type ............... Full-flow cartridge spin-on paper element
Cooling System ............... Forced circulation liquid-cooled centrifugal
Water Pump Type ............... Belt-driven centrifugal impeller layout
Air Cleaner Type ............... Dry dual-element heavy-duty filtration assembly
Starting System ............... Electric Starter motor
Electrical System, V ............... 12
Alternator Capacity, A ............... 40 or 55

Fuel System

Injection Pump Type ............... Bosch-style in-line mini cassette pump
Fuel Feed Pump Type ............... Mechanical diaphragm style
Injection Nozzle Type ............... Throttle or pintle type matching indirect injection
Nozzle Injection Opening Pressure, psi (bar) ............... 1991-2132 (137.3-147.1)
Fuel Filter Type ............... Spin-on element cartridge type complete water separator
Fuel Tank Recommended Elevation, in (mm) ............... 11.8-19.6 (300.0-500.0)
Injection Timing, deg BTDC ............... 18.0-22.0
Injection Nozzle Holder Gasket Thickness, in (mm) ............... 0.039 (1.0)
Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Return Pipe Diameter, in (mm) ............... 0.196 (5.0)
Governor Type ............... Mechanical centrifugal type
Plunger Diameter, in (mm) ............... 0.216-0.275 (5.5-7.0)
Plunger Stroke, in (mm) ............... 0.275 (7.0)
Delivery Valve Opening Pressure, psi (bar) ............... 355-426 (24.5-29.4)
Fuel Transfer Pump Pressure, psi (bar) ............... 2.84-4.26 (0.19-0.29)
Fuel Grade Specification ............... Ultra-low sulfur diesel ASTM D975 No. 2-D or No. 1-D

Dimensions and Weight

Overall Length, in (mm) ............... 19.4-21.8 (495-555)
Overall Width, in (mm) ............... 16.5-18.1 (420-460)
Overall Height, in (mm) ............... 22.4-24.8 (570-630)
Dry Weight, lbs (kg) ............... 232-265 (105-120)
Wet Weight, lbs (kg) ............... 247-282 (112-128)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 412-441 (28.4-30.4)
Minimum Compression Pressure, psi (bar) ............... 341 (23.5)
Compression Pressure Between Cylinders, psi (bar) ............... 35.5 (2.45)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-56.8 (2.94-3.92)
Oil Pressure at Low Idle Speed, psi (bar) ............... 14.2 (0.98)
Oil Pressure Switch Actuation Range, psi (bar) ............... 4.26-7.11 (0.29-0.49)
Engine Oil Temperature Normal Range, F (C) ............... 185-230 (85.0-110.0)
Coolant Temperature Standard, F (C) ............... 176-194 (80.0-90.0)
Thermostat Opening Temperature, F (C) ............... 160-165 (71.0-73.9)
Thermostat Full Open Temperature, F (C) ............... 185 (85.0)
Fan Belt Deflection Tension, in (mm) ............... 0.275-0.393 (7.0-10.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.0078 (0.20)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0078 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CC, CD, CE, CF, or CF-4
Engine Oil Capacity with Filter, qt (L) ............... 4.12-4.75 (3.9-4.5)
Engine Oil Capacity without Filter, qt (L) ............... 3.69-4.22 (3.5-4.0)
Cooling System Capacity, qt (L) ............... 4.75-6.34 (4.5-6.0)

Service Intervals

Change oil and filter ............... Every 200 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 500 hours
Replace fuel filter ............... Every 400 hours
Valve clearance adjustment ............... Every 600 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 800 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.2283-3.2291 (82.000-82.022)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.2362 (82.200)
Cylinder Bore Taper Wear Limit, in (mm) ............... 0.0011 (0.030)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9846-0.9854 (25.012-25.030)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 2.0456-2.0464 (51.964-51.984)
Crankpin Journal Outer Diameter, in (mm) ............... 1.7307-1.7314 (43.962-43.980)
Crankshaft Main 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)
Piston Pin to Connecting Rod Bushing Clearance, in (mm) ............... 0.0004-0.0014 (0.012-0.038)
Piston Outer Diameter, in (mm) ............... 3.2251-3.2263 (81.920-81.950)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.100)
Piston Pin Bore Outer Diameter, in (mm) ............... 0.9842-0.9846 (25.000-25.010)
Piston Pin Outer Diameter, in (mm) ............... 0.9839-0.9842 (24.992-25.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.018)
Top Ring Groove Side Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.100)
Second Ring Groove Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.20-0.35)
Second Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.20-0.35)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.20-0.40)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.05)
Intake Valve Stem Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Diameter, in (mm) ............... 0.2728-0.2736 (6.930-6.950)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0025 (0.030-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0017-0.0031 (0.045-0.080)
Valve Guide Installed Projection Height Above Head, in (mm) ............... 0.433-0.472 (11.0-12.0)
Valve Spring Free Length, in (mm) ............... 1.496-1.535 (38.0-39.0)
Valve Seat Angle, deg ............... 45.0
Valve Seat Width, in (mm) ............... 0.059-0.071 (1.5-1.8)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Camshaft Journal Outer Diameter (Middle), in (mm) ............... 1.5338-1.5346 (38.960-38.980)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.4944-1.4952 (37.960-37.980)
Camshaft Bearing Inner Bushing Clearance, in (mm) ............... 0.0007-0.0035 (0.020-0.090)
Intake Cam Lobe Height, in (mm) ............... 1.3417-1.3440 (34.080-34.140)
Exhaust Cam Lobe Height, in (mm) ............... 1.3433-1.3456 (34.120-34.180)
Tappet Valve Lifter Body Outer Diameter, in (mm) ............... 0.8645-0.8653 (21.960-21.980)
Tappet Guide Bore Inside Diameter, in (mm) ............... 0.8661-0.8670 (22.000-22.021)
Tappet Body to Block Guide Clearance, in (mm) ............... 0.0007-0.0024 (0.020-0.061)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4722 (11.982-11.998)
Rocker Arm Bushing Internal Bore Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0000-0.0014 (0.002-0.036)
Idler Gear Shaft Pin Outer Diameter, in (mm) ............... 1.3362-1.3370 (33.940-33.960)
Idler Gear Internal Bushing Bore Diameter, in (mm) ............... 1.3385-1.3395 (34.000-34.025)
Idler Gear Bushing to Shaft Pin Clearance, in (mm) ............... 0.0015-0.0033 (0.040-0.085)

Tightening Torques

Cylinder Head Bolts (1-Stage), lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Cylinder Head Bolts (2-Stage), lb-ft (Nm) ............... 50.6-54.2 (68.6-73.5)
Cylinder Head Bolts (3-Stage), lb-ft (Nm) ............... 72.3-79.5 (98.0-107.8)
Connecting Rod Cap Securing Nuts, lb-ft (Nm) ............... 34.7-39.7 (47.0-53.9)
Main Bearing Cap Supporting Anchor Bolts, lb-ft (Nm) ............... 72.3-79.5 (98.0-107.8)
Flywheel Retaining Mount Attachment Bolts, lb-ft (Nm) ............... 86.7-93.9 (117.6-127.4)
Crankshaft Center Pulley Face Nut Bolt, lb-ft (Nm) ............... 173.5-188.0 (235.2-254.8)
Rocker Arm Shaft Support Mounting Nuts, lb-ft (Nm) ............... 20.2-25.3 (27.4-34.3)
Valve Cover Top Retaining Acorn Hex Cap Nuts, lb-ft (Nm) ............... 5.7-8.6 (7.8-11.7)
Injection Pump Cassette Assembly Mount Stud Nuts, lb-ft (Nm) ............... 14.4-20.2 (19.6-27.4)
Injection Nozzle Assembly Outer Body Shell Locknut, lb-ft (Nm) ............... 43.3-57.8 (58.8-78.4)
Injection Nozzle Holder Body Hex Head Nuts, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
High-Pressure Fuel Injection Steel Tube Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Glow Plug Terminal Body Base Installation Screws, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Oil Sump Sump Base Sheet Metal Perimeter Bolts, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Oil Sump Lubricant Low Point Drain Plug Bolt, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Timing Gear Case Cover Housing Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Idler Gear Shaft Support Pad Mount Bolt, lb-ft (Nm) ............... 20.2-27.4 (27.4-37.2)
Exhaust Manifold Heat Duct Casting Stud, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Intake Manifold Duct Casting Assembly Screws, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Water Pump Structural Housing Mounting Screws, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Thermostat Housing Top Cover Water Outlet Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Oil Pressure Sensor Sending Switch, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Water Temperature Sensor, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Starter Motor Mounting Flange Hex Bolts, lb-ft (Nm) ............... 34.7-47.0 (47.0-63.7)
Alternator Main Support Pivot Base Anchor Bolt, lb-ft (Nm) ............... 34.7-47.0 (47.0-63.7)
Alternator Adjusting Slide Tension Arm Position Bolt, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Fuel Feed Supply Mechanical Diaphragm Pump Studs, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Oil Pump Back Cover Assembly Internal Screws, lb-ft (Nm) ............... 5.7-8.6 (7.8-11.7)
Flywheel Housing Heavy Block Face Connection Bolts, lb-ft (Nm) ............... 34.7-43.3 (47.0-58.8)
Crankcase Breather Valve Baffle Chamber Screws, lb-ft (Nm) ............... 3.6-5.7 (4.9-7.8)
Injection Pump Drive Gear Hub End Nut Attachment, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Camshaft Gear Hub Retaining Hex Head Flange Bolt, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Rocker Cover Center Structural Stay Bar Mounting Nuts, lb-ft (Nm) ............... 8.6-11.5 (11.7-15.6)
Fan Drive Belt Pulley Outer Bracket Extension Studs, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Oil Filter Internal Threaded Central Stud Connector, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Fuel Filter Mounting Cylinder Head Attachment Screws, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Air Cleaner Mounting Saddle Ring Clamp Nuts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Exhaust Outlet Adaptor Elbow Flange Casting Bolts, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Engine Support Foot Bracket Side Block Bolts, lb-ft (Nm) ............... 34.7-47.0 (47.0-63.7)
Bell Housing Outer Perimeter Dust Shield Metal Bolts, lb-ft (Nm) ............... 5.7-8.6 (7.8-11.7)

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