________________________________________________________________________________

Shibaura J843 Engine

The Shibaura J843 is a heavy-duty, vertical, 3-cylinder, 4-stroke, liquid-cooled diesel engine engineered for industrial, agricultural, and turf applications. Commonly deployed in machinery such as compact tractors (including the New Holland TC29D) and high-capacity front mowers like the Shibaura CM284, this naturally aspirated engine is highly regarded for its compact footprint, reliable mechanical efficiency, and high torque output at low operating speeds. It shares design commonalities and component interchangeability with certain Perkins 400-series engine families.

Valve Configuration: Overhead valve (OHV) layout with 2 valves per cylinder (1 intake, 1 exhaust). Maintenance Cycle: Standard inspection and clearance adjustment are required every 2,000 operational hours or whenever abnormal valve train noise occurs. Cylinder Bore: 84.0 mm (3.307 in). Piston Stroke: 80.0 mm (3.151 in). Total Displacement: 1,330 cc.

Fuel System: Indirect injection (IDI) design utilizing a pre-combustion chamber configuration for minimized noise and clean combustion. Injection Pump: Mechanical inline multi-plunger injection pump driven directly off the engine gear train. Injection Timing: Factory set to fire between 18 and 20 deg BTDC. Cold Start Assistance: Outfitted with an integrated 12V super-high-speed quick glow plug circuit per cylinder to ensure prompt ignition in sub-freezing environments.

Lubrication System: Forced pressure lubrication system supplied by a positive-displacement internal gear oil pump. Filtration: Full-flow, spin-on cartridge filtration setup. Cooling System: Liquid-cooled, closed-loop forced circulation network utilizing a belt-driven centrifugal water pump and radiator matrix. Thermal Control: Monitored via a mechanical thermostat capsule to regulate optimal operating temperatures.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura J843
Engine Type ............... 4-cycle vertical inline 3-cylinder liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.31 (84.0)
Engine Stroke, in (mm) ............... 3.15 (80.0)
Displacement, cu.in (L) ............... 81.2 (1.33)
Rated Engine Power, hp (kW) ............... 24.0-28.0 (17.9-20.9)
Rated Engine Speed, rpm ............... 2500-2600
Peak Torque ............... 79 Nm (58.2 lb-ft) at 1800 rpm
Idle Speed ............... 850-950 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2500 rpm
Compression Ratio ............... 22.0:1-23.0:1
Firing Order ............... 1-2-3
Combustion System ............... Indirect injection
Rotation Direction ............... Counter-clockwise viewed from flywheel
Crankshaft Material ............... Forged steel
Connecting Rod Material ............... Forged alloy steel
Piston Material ............... Aluminum alloy with iron strut
Camshaft Drive ............... Gear driven
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure trochoid pump
Oil Pump Type ............... Gear-driven trochoid
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled forced circulation
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry element
Starting System ............... Electric Starter
Electrical System ............... 12V
Alternator Capacity, A ............... 40

Fuel System

Injection Pump Type ............... Bosch-type in-line mini pump
Governor Type ............... Mechanical centrifugal
Fuel Injection Nozzle ............... Throttle type Bosch NP-DN4PDN117
Fuel Injection Pressure, psi (MPa) ............... 1740-1920 (12.0-13.2)
Injection Timing ............... 18-20 degrees BTDC
Plunger Stroke, in (mm) ............... 0.275 (7.0)
Plunger Diameter, in (mm) ............... 0.216 (5.5)
Delivery Valve Opening Pressure, psi (MPa) ............... 435 (3.0)
Fuel Transfer Pump Type ............... Mechanical diaphragm type
Fuel Filter Type ............... Spin-on element with water sedimenter
Recommended Fuel Type ............... Ultra-low sulfur diesel ASTM D975 No.2-D
Maximum Fuel Return Flow, gph (L/h) ............... 3.17 (12.0)
Maximum Fuel Inlet Restriction, in.Hg (kPa) ............... 3.93 (13.3)
Fuel Injection Nozzle Spray Angle ............... 4 degrees
Fuel Tank Vent System ............... Atmospheric open vent
Leak-off Pipe Type ............... Steel pipe with rubber return lines
Cold Start Aid ............... Sheathed type glow plugs
Glow Plug Current Draw, A ............... 10 per plug
Glow Plug Preheat Time, sec ............... 5-10
Fuel Feed Pipe Diameter, in (mm) ............... 0.236 (6.0)
Fuel Return Pipe Diameter, in (mm) ............... 0.157 (4.0)
Injection Pump Lubrication ............... Engine oil splash forced feed
Injection Nozzle Holder Type ............... Screw-in type flange assembly
Maximum Allowable Fuel Temperature, F (C) ............... 140 (60)

Dimensions and Weight

Overall Length, in (mm) ............... 21.8 (554)
Overall Width, in (mm) ............... 17.3 (440)
Overall Height, in (mm) ............... 22.6 (575)
Dry Weight, lbs (kg) ............... 242 (110)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 426 (2.94)
Compression Pressure, Limit, psi (MPa) ............... 355 (2.45)
Oil Pressure Minimum at Idle, psi (MPa) ............... 14.2 (0.10)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.30-0.39)
Oil Relief Valve Cracking Pressure, psi (MPa) ............... 56.8-71.1 (0.39-0.49)
Thermostat Opening Temperature, F (C) ............... 180 (82)
Thermostat Full Open Temperature, F (C) ............... 203 (95)
Cooling System Cap Pressure, psi (MPa) ............... 12.8 (0.09)
Fan Belt Tension Deflection, in (mm) ............... 0.27-0.35 (7.0-9.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0078 (0.200)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0078 (0.200)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CF or CF-4 or CH-4
Engine Oil Capacity with Filter, qt (L) ............... 4.54 (4.3)
Engine Oil Capacity without Filter, qt (L) ............... 4.01 (3.8)
Cooling System Fluid Capacity, qt (L) ............... 5.60 (5.3)

Service Intervals

Change oil and filter ............... Every 200 hours
Inspect air cleaner ............... Every 100 hours
Replace air cleaner ............... Every 500 hours
Replace fuel filter ............... Every 200 hours
Valve clearance adjustment ............... Every 1000 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 800 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.3071-3.3081 (84.000-84.025)
Cylinder Bore Taper Maximum, in (mm) ............... 0.0007 (0.020)
Cylinder Head Surface Distortion Warp, in (mm) ............... 0.0019 (0.050)
Cylinder Block Surface Distortion Warp, in (mm) ............... 0.0019 (0.050)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.957-67.970)
Crankpin Standard Diameter, in (mm) ............... 2.0458-2.0462 (51.964-51.975)
Crankshaft Main Bearing Oil Clearance, in (mm) ............... 0.0015-0.0033 (0.039-0.085)
Connecting Rod Bearing Oil Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft End Play, in (mm) ............... 0.0019-0.0068 (0.050-0.175)
Connecting Rod Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Outside Diameter, in (mm) ............... 3.3043-3.3051 (83.930-83.950)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0023-0.0035 (0.060-0.090)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1023-1.1027 (28.000-28.010)
Piston Pin Outer Diameter, in (mm) ............... 1.1020-1.1023 (27.992-28.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... -0.0001 to +0.0005 (-0.004 to +0.014)
Piston Pin to Connecting Rod Bushing Clearance, in (mm) ............... 0.0003-0.0009 (0.010-0.025)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
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) ............... 0.0078-0.0137 (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)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2738-0.2744 (6.955-6.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2726-0.2732 (6.925-6.940)
Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0023 (0.030-0.060)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0035 (0.060-0.090)
Valve Sink Depth, in (mm) ............... 0.0275-0.0374 (0.700-0.950)
Valve Seat Angle, degrees ............... 45
Valve Seat Width, in (mm) ............... 0.0590-0.0826 (1.500-2.100)
Valve Spring Free Length, in (mm) ............... 1.3779 (35.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.7692-1.7700 (44.940-44.960)
Camshaft Journal Outer Diameter (Center), in (mm) ............... 1.7692-1.7700 (44.940-44.960)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.7692-1.7700 (44.940-44.960)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Cam Lobe Height (Intake), in (mm) ............... 1.3409-1.3433 (34.060-34.120)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3409-1.3433 (34.060-34.120)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4722 (11.982-11.998)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0000-0.0014 (0.002-0.036)
Tappet Shaft Outer Diameter, in (mm) ............... 0.8643-0.8651 (21.956-21.977)
Tappet Guide Hole Inner Diameter, in (mm) ............... 0.8661-0.8669 (22.000-22.021)
Tappet to Guide Clearance, in (mm) ............... 0.0009-0.0025 (0.023-0.065)

Tightening Torques

Cylinder Head M10 Bolts, lb-ft (Nm) ............... 44-50 (60-68)
Cylinder Head M11 Bolts, lb-ft (Nm) ............... 65-69 (88-94)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 36-40 (49-54)
Main Bearing Cap Carrier Bolts, lb-ft (Nm) ............... 36-40 (49-54)
Main Bearing Carrier to Block Hex Bolts, lb-ft (Nm) ............... 20-24 (27-33)
Crankshaft Pulley Center Hub Nut, lb-ft (Nm) ............... 200-221 (271-300)
Flywheel Mounting Retaining Bolts, lb-ft (Nm) ............... 52-58 (70-79)
Rocker Arm Shaft Bracket Holding Bolts, lb-ft (Nm) ............... 15-18 (20-25)
Cylinder Head Valve Cover Acorn Nuts, lb-ft (Nm) ............... 6-9 (8-12)
Fuel Injection Pump Assembly Mounting Bolts, lb-ft (Nm) ............... 15-18 (20-25)
Fuel Injection Nozzle Retaining Nut, lb-ft (Nm) ............... 43-51 (59-69)
Fuel Injection Delivery Pipe Flare Nuts, lb-ft (Nm) ............... 18-22 (25-30)
Fuel Spill Leak-off Pipe Joint Nuts, lb-ft (Nm) ............... 15-18 (20-25)
Glow Plug Body Thread Center Hex, lb-ft (Nm) ............... 11-15 (15-20)
Glow Plug Harness Terminal Direct Small Nuts, lb-ft (Nm) ............... 1.0-1.5 (1.4-2.0)
Oil Pan Drain Plug Structural Bottom Bolt, lb-ft (Nm) ............... 22-29 (30-39)
Oil Pan Perimeter Base Retention Bolts, lb-ft (Nm) ............... 7-9 (10-12)
Oil Pressure Switch Sensor, lb-ft (Nm) ............... 11-15 (15-20)
Oil Relief Regulator Valve Plug Cap, lb-ft (Nm) ............... 29-36 (39-49)
Water Pump Assembly Base Casing Fasteners, lb-ft (Nm) ............... 15-18 (20-25)
Cooling System Water Temperature Sender Unit, lb-ft (Nm) ............... 18-22 (25-30)
Thermostat Housing Cover Plate Fasteners, lb-ft (Nm) ............... 7-9 (10-12)
Intake Manifold Flange Fasteners, lb-ft (Nm) ............... 11-15 (15-20)
Exhaust Manifold Structural Stud Flange Nuts, lb-ft (Nm) ............... 15-18 (20-25)
Starter Motor Frame Mounting Flange Bolts, lb-ft (Nm) ............... 36-43 (49-59)
Alternator Pivot Long Mounting Bolt, lb-ft (Nm) ............... 36-43 (49-59)
Alternator Tension Lock Strap Slide Fastener, lb-ft (Nm) ............... 15-18 (20-25)
Timing Gear Case Structural Cover Bolts, lb-ft (Nm) ............... 15-18 (20-25)
Timing Gear Camshaft Lock Gear Bolt, lb-ft (Nm) ............... 51-58 (69-79)
Timing Gear Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 43-51 (59-69)
Timing Gear Idler Shaft Spindle Support Bolt, lb-ft (Nm) ............... 22-27 (30-37)
Flywheel Housing Rear Frame Backing Bolts, lb-ft (Nm) ............... 36-43 (49-59)
Exhaust Pipe Connecting Flange Joint Nuts, lb-ft (Nm) ............... 22-29 (30-39)
Lubricating Oil Delivery Pipe Line Banjo Bolts, lb-ft (Nm) ............... 7-11 (10-15)
Oil Pump Base Cover Internal Screws, lb-ft (Nm) ............... 5-7 (7-10)
Fan Drive Pulley Outer Small Screws, lb-ft (Nm) ............... 7-9 (10-12)
Air Cleaner Mounting Support Bracket Bolts, lb-ft (Nm) ............... 15-18 (20-25)
Engine Mount Lower Foot Bracket Bolts, lb-ft (Nm) ............... 36-43 (49-59)
Fuel Filter Bracket Housing Engine Support Screws, lb-ft (Nm) ............... 15-18 (20-25)
Breather Valve Deflector Internal Plate Screws, lb-ft (Nm) ............... 4-5 (5-7)

________________________________________________________________________________________

• Shibaura Engines Specs
  
• Shibaura J823 Specs
  
• Shibaura LE892 Specs
  
• Shibaura LEK802D Specs
  
• Shibaura LEM853 Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________