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Shibaura N843L Engine

The Shibaura N843L is a heavy-duty, industrial-grade, multi-cylinder diesel engine designed for high efficiency, reliability, and compact power delivery. It is widely used in commercial turf equipment, agricultural machinery, and industrial utility vehicles. Characterized by an in-line configuration and a robust cast-iron cylinder block structure, this naturally aspirated power unit utilizes a swirl chamber (indirect injection) combustion system to optimize thermal efficiency and smooth operational characteristics while minimizing emissions.

The engine utilizes a traditional overhead valve layout (OHV layout) driven via a camshaft and rocker arm assembly. It features a 2 valves per cylinder structure (1 intake, 1 exhaust). Valve Design: In-line overhead valves actuated by pushrods. Cylinder Arrangement: 3 cylinders, arranged in-line. Bore: 84.0 mm (3.307 inches). Stroke: 100.0 mm (3.937 inches). Cooling System: Liquid-cooled, forced-water circulation loop managed by an engine-mounted water pump assembly. Thermostatic Control: Standard bypass configuration utilizing a mechanical thermostat to control core temperature stabilization.

Fuel System: Indirect injection into a swirl-type combustion chamber. Injection Pump: Bosch PFR injection pump inline setup, distributing high pressure directly via steel fuel delivery lines. Governor: Mechanical centrifugal type, built into the timing gear case assembly to regulate load-sensing fuel delivery and prevent over-speeding. Lubrication System: Forced, pressurized circulation system. Oil Pump: High-efficiency, crankshaft-driven trochoid pump. Oil Specification: Requires high-grade API Class CD diesel engine oil.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura N843L
Engine Type ............... 4-cycle vertical in-line overhead valve water-cooled diesel
Combustion Chamber Type ............... Swirl chamber type
Number of Cylinders ............... 3
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 3.30 (84.0)
Engine Stroke, in (mm) ............... 3.93 (100.0)
Total Displacement, cu.in (L) ............... 101.4 (1.662)
Rated Power at 2400 rpm, hp (kW) ............... 33.5 (25.0)
Rated Power at 2600 rpm, hp (kW) ............... 35.1 (26.2)
Rated Power at 2800 rpm, hp (kW) ............... 36.2 (27.0)
Net Power at 2400 rpm, hp (kW) ............... 31.1 (23.2)
Net Power at 2600 rpm, hp (kW) ............... 32.8 (24.5)
Net Power at 2800 rpm, hp (kW) ............... 34.0 (25.4)
Rated Speed, rpm ............... 2800
High Idle Speed, rpm ............... 2950-3050
Low Idle Speed, rpm ............... 900-1000
Peak Torque at 1800 rpm, lb-ft (Nm) ............... 76.7 (104.0)
Compression Ratio ............... 22.5:1
Firing Order ............... 1-2-3
Direction of Rotation ............... Counter-clockwise viewed from flywheel side
Aspiration Type ............... Naturally aspirated
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Heavy-duty cast iron
Number of Intake Valves per Cylinder ............... 1
Number of Exhaust Valves per Cylinder ............... 1
Valve Mechanism Type ............... Pushrod-operated overhead valve system
Piston Type ............... Aluminum alloy with swirl combustion bowl
Number of Piston Rings ............... 3 rings per piston
Crankshaft Material ............... Forged steel with induction hardened journals
Camshaft Material ............... Chill-hardened cast iron alloy
Camshaft Drive Type ............... Gear-driven helical gear train
Lubrication System ............... Forced pressure feed by trochoid gear pump
Oil Filter System ............... Full-flow spin-on cartridge filtration unit
Cooling System ............... Forced circulation centrifugal water pump
Cooling Fan Type ............... Pusher or puller multi-blade plastic fan
Water Pump Type ............... Belt-driven centrifugal
Air Cleaner Type ............... Dry element dual-stage filter element
Starting System ............... Electric starter motor
Electrical System ............... 12V
Alternator Charging ............... 40A or 55A

Fuel System

Injection Pump Type ............... Bosch-type inline cassette injection pump
Fuel Injection Timing, deg BTDC ............... 19-21
Injector Nozzle Holder Model ............... Bosch slim-shank type assembly
Fuel Injection Nozzle Type ............... Throttle-type pintle mechanism component
Nozzle Valve Opening Pressure, psi (MPa) ............... 2132-2275 (14.7-15.7)
Fuel Feed Pump Type ............... Mechanical diaphragm lift pump mechanism
Fuel Lift Pump Drive Cam Location ............... Dedicated lobe on engine camshaft
Fuel Lift Pump Delivery Pressure, psi (kPa) ............... 2.9-4.3 (20.0-30.0)
Fuel Lift Pump Minimum Flow Rate, qt/min (L/min) ............... 0.63 (0.60)
Fuel Filter Construction ............... Spin-on element with sedimenter bowl
Maximum Fuel Inlet Temperature Limit, F (C) ............... 140 (60)
Fuel Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Fuel Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Spill Leak-off Pipe Diameter, in (mm) ............... 0.157 (4.0)
Governor Type ............... Mechanical centrifugal all-speed
Injection Pump Plunger Diameter, in (mm) ............... 0.236 (6.0)
Injection Pump Plunger Stroke length, in (mm) ............... 0.275 (7.0)
Delivery Valve Standard Stop Pressure, psi (MPa) ............... 426 (2.94)
Injection Nozzle Spray Angle Pattern ............... 4 deg

Dimensions and Weight

Overall Length, in (mm) ............... 22.4 (570)
Overall Width, in (mm) ............... 18.5 (470)
Overall Height, in (mm) ............... 26.2 (665)
Dry Weight, lbs (kg) ............... 327 (148)
Wet Weight, lbs (kg) ............... 349 (158)

Maintenance Data

Service Information

Standard Compression Pressure, psi (MPa) ............... 426 (2.94)
Minimum Compression Pressure, psi (MPa) ............... 355 (2.45)
Maximum Compression Between Cylinders, psi (MPa) ............... 35.5 (0.25)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.6-56.8 (294.0-392.0)
Oil Pressure at Idle Speed, psi (kPa) ............... 14.2 (98.1)
Oil Pressure Switch Activation Value, psi (kPa) ............... 11.4-14.2 (78.5-98.1)
Normal Operating Lubricating Oil Temperature, F (C) ............... 185-230 (85-110)
Standard Coolant Operating Temperature, F (C) ............... 176-194 (80-90)
Coolant Thermostat Opening Crack Temperature, F (C) ............... 160 (71)
Coolant Thermostat Full Open Temperature, F (C) ............... 185 (85)
Radiator Cap Pressure Release Valve, psi (kPa) ............... 12.8 (88.3)
Intake Valve Clearance, in (mm) ............... 0.0078 (0.200)
Exhaust Valve Clearance, 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, CF-4, CH-4
Engine Oil Capacity, High Limit, qt (L) ............... 6.34 (6.0)
Engine Oil Capacity, Low Limit, qt (L) ............... 4.43 (4.2)
Coolant Capacity Block, Only, qt (L) ............... 2.74 (2.6)
Cooling System Fluid Capacity, qt (L) ............... 6.86 (6.5)

Service Intervals

Change oil and filter ............... Every 250 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 2000 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.3071-3.3078 (84.000-84.019)
Cylinder Bore Wear Limit, in (mm) ............... 3.3150 (84.200)
Cylinder Bore Roundness, in (mm) ............... 0.0004 (0.010)
Cylinder Block Upper Deck Surface Flatness, in (mm) ............... 0.0020 (0.050)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1027-1.1033 (28.010-28.025)
Connecting Rod Small End Bushing Clearance, in (mm) ............... 0.0003-0.0012 (0.010-0.031)
Connecting Rod Big End Inside Bore Diameter, in (mm) ............... 2.1653-2.1659 (55.000-55.015)
Connecting Rod Big End Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6755-2.6759 (67.959-67.974)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0015-0.0040 (0.039-0.102)
Crankshaft End Play, in (mm) ............... 0.0019-0.0068 (0.050-0.175)
Crankpin Journal Standard Diameter, in (mm) ............... 2.0458-2.0462 (51.964-51.975)
Crankpin Bearing Oil Clearance, in (mm) ............... 0.0013-0.0035 (0.035-0.089)
Piston Skirt Outer Diameter, in (mm) ............... 3.3043-3.3051 (83.930-83.950)
Piston-to-Cylinder Bore Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.089)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1024-1.1027 (28.001-28.009)
Piston Pin Outer Diameter, in (mm) ............... 1.1021-1.1023 (27.994-28.000)
Piston Pin-to-Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0006 (0.001-0.015)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0610-0.0618 (1.550-1.570)
Oil Ring Groove Width, in (mm) ............... 0.1581-0.1589 (4.015-4.035)
Top Ring Side Clearance, in (mm) ............... 0.0023-0.0043 (0.060-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
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) ............... 0.0078-0.0157 (0.200-0.400)
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)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2724-0.2732 (6.920-6.940)
Intake Valve Stem-to-Guide Clearance, in (mm) ............... 0.0013-0.0026 (0.035-0.068)
Exhaust Valve Stem-to-Guide Clearance, in (mm) ............... 0.0023-0.0038 (0.060-0.098)
Valve Guide Inside Diameter Standard Installed, in (mm) ............... 0.2755-0.2763 (7.000-7.018)
Valve Face Angle ............... 45 degrees
Valve Seat Angle ............... 45 degrees
Valve Spring Free Length, in (mm) ............... 1.3779 (35.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Camshaft Journal Outer Diameter (Middle), in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Camshaft Bearing Bore Inside Diameter, in (mm) ............... 1.5748-1.5757 (40.000-40.025)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0007-0.0025 (0.020-0.065)
Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Cam Lobe Height (Intake), in (mm) ............... 1.3417-1.3440 (34.080-34.140)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3417-1.3440 (34.080-34.140)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4594-0.4600 (11.670-11.685)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.4606-0.4618 (11.700-11.730)
Rocker Arm-to-Shaft Clearance, in (mm) ............... 0.0005-0.0023 (0.015-0.060)
Tappet Lifter Outer Diameter, in (mm) ............... 0.8641-0.8651 (21.950-21.975)
Tappet Guide Hole Inside Diameter, in (mm) ............... 0.8661-0.8671 (22.000-22.025)
Tappet Lifter-to-Block Guide Hole Clearance, in (mm) ............... 0.0009-0.0029 (0.025-0.075)

Tightening Torques

Cylinder Head Stud Bolts, Final, lb-ft (Nm) ............... 65.0-69.0 (88.0-93.5)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 36.0-40.0 (49.0-54.0)
Crankshaft Main Bearing Cap Housing Bolts, lb-ft (Nm) ............... 36.0-40.0 (49.0-54.0)
Crankshaft Center Main Bearing Housing Bolt, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Flywheel Retaining Mount Hex Face Bolts, lb-ft (Nm) ............... 51.0-55.0 (69.0-74.5)
Flywheel Housing Adaptor Shell Backplate Fasteners, lb-ft (Nm) ............... 33.0-38.0 (44.5-51.5)
Crankshaft Front Pulley Dynamic Damper Nut, lb-ft (Nm) ............... 217.0-238.0 (294.0-323.0)
Camshaft Thrust Retaining Plate Screw Bolt, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Timing Gear Cover Outer Sheet Face Bolt Case, lb-ft (Nm) ............... 14.0-17.0 (19.0-23.0)
Timing Gear Idler Pin Center Mounting Shaft Stud, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Rocker Arm Pillar Stand Bridge Mounting Base Nut, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Rocker Arm Lash Adjustment Screw Lock Nut Shell, lb-ft (Nm) ............... 10.0-13.0 (13.5-17.5)
Valve Rocker Arm Mechanism Cover Top Dome Cap Nut, lb-ft (Nm) ............... 6.0-8.0 (8.0-11.0)
Oil Pump Internal Back Cover Torquing Cap Screws, lb-ft (Nm) ............... 6.0-8.0 (8.0-11.0)
Oil Sump Pan Structural Sheet Steel Flange Screws, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Oil Pan Sump Bottom Profile Hex Extraction Plug, lb-ft (Nm) ............... 22.0-27.0 (30.0-36.5)
Oil Pressure Safety Warning Switch Core Thread Hex, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Water Pump Main Shaft Flange Pulley Face Bolts, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Cooling Thermostat Top Shell Housing Cover Screws, lb-ft (Nm) ............... 14.0-17.0 (19.0-23.0)
Air Intake Distribution Manifold Mount Flange Studs, lb-ft (Nm) ............... 14.0-17.0 (19.0-23.0)
Exhaust Collection Collector Manifold Base Nut Studs, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Fuel Injection Pump Cassette Retention Flange Nut, lb-ft (Nm) ............... 14.0-17.0 (19.0-23.0)
Fuel Injector Assembly Structural Threaded Hold Collar, lb-ft (Nm) ............... 43.0-51.0 (58.0-69.0)
Fuel Injection High Pressure Pipeline Union Swivel, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Fuel Injection Overflow Residual Pipe Leakage Joint, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Glow Plug Internal Combustion Swirl Shell Core Thread, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Glow Plug Top Power Distribution Busbar Small Hex Nut, lb-ft (Nm) ............... 1.0-1.5 (1.3-2.0)
Starter Motor Shell Frame Flange Bolt Rings Mount, lb-ft (Nm) ............... 33.0-38.0 (44.5-51.5)
Alternator Main Support Swivel Point Attachment Bolt, lb-ft (Nm) ............... 33.0-38.0 (44.5-51.5)
Alternator Slotted Tension Bracing Adjustment Screw, lb-ft (Nm) ............... 14.0-17.0 (19.0-23.0)
Crankcase Breather Outer Valve Retention Mount Plate, lb-ft (Nm) ............... 6.0-8.0 (8.0-11.0)

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• Shibaura Engines Specs
  
• Shibaura N843 Specs
  
• Shibaura N843T-F Specs
  
• Shibaura N844 Specs
  
• Shibaura N844L Specs
  
• Shibaura N844LT Specs
  
• Shibaura N844T Specs
  

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