________________________________________________________________________________

Shibaura N843T-F Engine

The Shibaura N843T-F is a liquid-cooled, 3-cylinder, turbocharged diesel engine engineered for compact agricultural equipment, industrial machinery, and utility tractors. Characterized by an overhead valve configuration and an indirect or direct injection layout depending on application tiering, this engine is optimized for heavy-duty torque production under a compact form factor. It is certified across Tier 1 and Tier 2 compliance benchmarks depending on production year. The sub-compact footprint features a reinforced cylinder block assembly alongside a high-efficiency forced lubrication setup to ensure extended durability under heavy workloads.

The cylinder head utilizes an overhead valve (OHV) mechanism driven via a robust gear-train timing array operating pushrods and rocker arms. Valve clearance adjustments must be performed strictly when the engine block is cold. Displacing a total volume of 1.496 liters (91 cubic inches), the structural piston geometry comprises: Cylinder Bore: 84.0 mm, Piston Stroke: 90.0 mm. Engine lubrication is sustained via a forced pressure feed configuration driven by a high-capacity internal trochoid oil pump linked to the main crankshaft timing gear. Lubricant flows through a full-flow, spin-on oil filter element before entering the primary oil gallery to feed the main bearings, rod journals, and rocker assemblies.

The fuel deployment configuration relies on an inline mechanical injection pump driven seamlessly by the secondary timing assembly gear. Fuel is drawn from the supply tank, through a primary water-separating sedimenter and a high-micron fuel filter element, prior to arriving at the injection pump inlet. High-pressure steel lines route metered fuel fractions directly to the injection nozzles. Fuel atomization matches a mechanical firing order cycle sequence of 1-2-3, providing clean combustion cycles and mitigating unburnt diesel smoke output under varied tractor governor positions.

Cooling System: Thermal regulation uses a continuous forced-circulation liquid cooling loop managed by a heavy-duty belt-driven centrifugal water pump. The coolant distribution channels thread directly through the primary passages of the cylinder block casting and up into the valve deck layout to minimize thermal expansion variances during peak torque demands. A wax-pellet type thermostat monitors block temperature to regulate passage flow to the external radiator setup.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura N843T-F
Engine Type ............... 4-cycle inline 3-cylinder turbocharged liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.31 (84.0)
Engine Stroke, in (mm) ............... 3.54 (90.0)
Displacement, cu.in (L) ............... 91.3 (1.496)
Rated Engine Power, hp (kW) ............... 36.5 (27.2)
Rated Engine Speed, rpm ............... 2600
Peak Torque ............... 74.5 lb-ft (101.0 Nm) at 1800 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Turbocharged
Compression Ratio ............... 22.5:1
Firing Order ............... 1-2-3
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron overhead valve type
Combustion Type ............... Swirl chamber type
Lubrication System ............... Full-pressure lubrication
Oil Pump Type ............... Trochoid rotor pump system
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Liquid-cooled system
Water Pump Type ............... Belt-driven centrifugal type
Air Cleaner Type ............... Dry element dual-stage filter element
Starting System ............... Electric starter motor system
Electrical System ............... 12V
Alternator Capacity ............... 40A

Fuel System

Injection Pump Type ............... Bosch PFR type in-line mini pump unit
Governor Type ............... Mechanical all-speed centrifugal weight
Injection Nozzle Type ............... Throttle type nozzle element
Fuel Injection Timing ............... 19.0-21.0 deg BTDC
Injection Pressure, psi (MPa) ............... 2132.0 (14.7)
Fuel Filter Type ............... Spin-on element cartridge, water separator
Fuel Transfer Pump Type ............... Mechanical diaphragm type
Recommended Fuel Grade ............... Ultra-low sulfur ASTM D975 No.2-D diesel grade fuel
Maximum Fuel Return Flow, gph (L/h) ............... 4.5 (17.0)
Nozzle Opening Pressure, Std, psi (bar) ............... 2132.0-2277.0 (147.0-157.0)
Nozzle Opening Pressure, Limit, psi (bar) ............... 1849.0 (127.5)
Injection Line Inner Diameter, in (mm) ............... 0.078 (2.0)
Injection Line Outer Diameter, in (mm) ............... 0.236 (6.0)
Maximum Fuel Temperature, F (C) ............... 140.0 (60.0)

Dimensions and Weight

Overall Length, in (mm) ............... 21.0 (535)
Overall Width, in (mm) ............... 18.1 (460)
Overall Height, in (mm) ............... 25.9 (655)
Dry Weight, lbs (kg) ............... 397 (180)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 426 (2.94)
Compression Pressure, Limit, psi (MPa) ............... 355 (2.45)
Oil Pressure at Low Idle, psi (kPa) ............... 14.2 (98.0)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.6-56.8 (294.0-392.0)
Maximum Engine Oil Temperature, F (C) ............... 248.0 (120.0)
Thermostat Opening Temperature, F (C) ............... 160.0-165.0 (71.0-74.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Coolant Temperature Warning Switch Activation, F (C) ............... 230.0 (110.0)
Oil Pressure Warning Switch Activation, psi (kPa) ............... 4.3 (29.4)
Turbocharger Boost Pressure, psi (bar) ............... 7.2-10.1 (0.50-0.70)
Fan Belt Deflection, in (mm) ............... 0.28-0.35 (7.0-9.0)
Intake Valve Clearance, in (mm) ............... 0.008 (0.20)
Exhaust Valve Clearance, in (mm) ............... 0.008 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CF, CF-4, CH-4, or CI-4
Engine Oil Capacity with Filter, qt (L) ............... 6.02 (5.7)
Engine Oil Capacity without Filter, qt (L) ............... 5.39 (5.1)
Coolant Capacity, Engine Only, qt (L) ............... 2.85 (2.7)

Service Intervals

Change oil and filter ............... Every 250 hours
Inspect air cleaner ............... Every 100 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Fuel system inspection ............... Every 500 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 2000 hours
Clean radiator core ............... Every 300 hours
Inspect belt tension ............... Every 200 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.3071-3.3078 (84.000-84.019)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.3150 (84.200)
Cylinder Block Upper Surface Flatness, in (mm) ............... Under 0.0020 (0.050)
Main Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.959-67.970)
Main Bearing Oil Clearance, in (mm) ............... 0.0017-0.0040 (0.044-0.102)
Crankpin Journal Diameter, in (mm) ............... 2.0458-2.0463 (51.964-51.975)
Crankpin Bearing Oil Clearance, in (mm) ............... 0.0014-0.0033 (0.035-0.085)
Crankshaft End Play, in (mm) ............... 0.0020-0.0069 (0.050-0.175)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1031-1.1039 (28.020-28.038)
Connecting Rod Big End Inner Diameter, in (mm) ............... 2.1654-2.1661 (55.000-55.018)
Connecting Rod Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Outer Diameter, in (mm) ............... 3.3045-3.3053 (83.935-83.955)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0018-0.0033 (0.045-0.084)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1024-1.1028 (28.002-28.011)
Piston Pin Outer Diameter, in (mm) ............... 1.1020-1.1024 (27.992-28.000)
Piston Pin to Bore Clearance, in (mm) ............... 0.0001-0.0007 (0.002-0.019)
Top Ring Groove Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Second Ring Groove Side Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0079-0.0138 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Cylinder Head Bottom Gasket Flatness, in (mm) ............... Under 0.0020 (0.050)
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)
Intake Valve Guide to Stem Clearance, in (mm) ............... 0.0012-0.0024 (0.030-0.060)
Exhaust Valve Guide to Stem Clearance, in (mm) ............... 0.0024-0.0035 (0.060-0.090)
Valve Face Angle ............... 45
Valve Seat Angle ............... 45
Valve Spring Free Length, in (mm) ............... 1.3780 (35.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.8484-1.8492 (46.950-46.970)
Camshaft Journal Outer Diameter (Middle), in (mm) ............... 1.8287-1.8295 (46.450-46.470)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.8091-1.8098 (45.950-45.970)
Camshaft Bearing Oil Clearance, in (mm) ............... 0.0059 (0.150)
Cam Lobe Height (Intake), in (mm) ............... 1.3411-1.3431 (34.065-34.115)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3429-1.3449 (34.110-34.160)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4713-0.4720 (11.972-11.987)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4736 (12.000-12.030)
Rocker Arm Oil Clearance, in (mm) ............... 0.0005-0.0023 (0.013-0.058)
Tappet Lifter Bushing Block Hole Diameter, in (mm) ............... 0.4724-0.4732 (12.000-12.018)
Tappet Lifter Body Outer Diameter, in (mm) ............... 0.4711-0.4718 (11.966-11.984)
Tappet Lifter to Block Bore Clearance, in (mm) ............... 0.0039 (0.100)

Tightening Torques

Cylinder Head Cap Screws, 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)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 36.0-40.0 (49.0-54.0)
Flywheel Retaining Bolts, lb-ft (Nm) ............... 44.0-47.0 (60.0-64.0)
Crankshaft Pulley Damper Center Bolt, lb-ft (Nm) ............... 90.0-98.0 (122.0-133.0)
Rocker Arm Shaft Bracket Bolts, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Valve Cover Cap Screws, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Fuel Injection Pump Delivery Valve Holder, lb-ft (Nm) ............... 29.0-33.0 (39.0-45.0)
Fuel Injection Pump Locking Fix Nut, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.0)
Fuel Injector Assembly Outer Body into Head, lb-ft (Nm) ............... 44.0-48.0 (60.0-65.0)
Fuel Injector Cap Nut Leak-Off Body, lb-ft (Nm) ............... 22.0-25.0 (30.0-34.0)
Fuel Injection High Pressure Line Flare Nuts, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Glow Plug Hex Base Fitting Threads, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.0)
Oil Pan Perimeter Base Mounting Screws, lb-ft (Nm) ............... 8.0-11.0 (11.0-15.0)
Oil Pan Bottom Central Drain Plug, lb-ft (Nm) ............... 25.0-30.0 (34.0-41.0)
Oil Pressure Switch Sensor Threaded Body, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Coolant Temperature Sender Unit Fitting, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Water Pump Assembly Mounting Face Bolts, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Thermostat Housing Top Outlet Retainer Bolts, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Intake Manifold Runner Pipe Retention Bolts, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Exhaust Manifold Structural Flange Mounting Nuts, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Turbocharger Oil Inlet Supply Line Banjo Union, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Turbocharger Gas Flange Mounting Base Studs, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Turbocharger Oil Drain Line Back to Sump Bolts, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Timing Gear Case Cover Outer Shield Bolts, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Camshaft Thrust Plate Internal Retaining Bolt, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Idler Gear Hub Retention Center Core Bolt, lb-ft (Nm) ............... 20.0-24.0 (27.0-32.5)
Flywheel Back Housing Plate Frame Bolts, lb-ft (Nm) ............... 33.0-38.0 (45.0-51.5)
Alternator Pivot Mount Bracket Support Bolt, lb-ft (Nm) ............... 30.0-35.0 (41.0-47.5)
Alternator Adjusting Slider Link Stay Screw, lb-ft (Nm) ............... 15.0-18.0 (20.0-24.5)
Starter Motor Flange Secure Mounting Bolt, lb-ft (Nm) ............... 33.0-38.0 (45.0-51.5)
Exhaust Pipe Down Adapter Outer Packing Nut, lb-ft (Nm) ............... 22.0-26.0 (30.0-35.5)
Air Intake Duct Tube Clamp Fastening, lb-ft (Nm) ............... 3.0-4.0 (4.0-5.5)
Fan Blade Assembly to Water Pump Flange Screws, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Lubricating Oil Strainer Suction Tube Internal Nut, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Crankcase Breathing Chamber Internal Cover Screws, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Injection Pump Automatic Timer Retaining Center Nut, lb-ft (Nm) ............... 44.0-51.0 (60.0-69.0)
Fuel Shut-Off Solenoid Valve Actuator Thread Cylinder, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.0)
Oil Relief Valve Spring Large Cap Plug, lb-ft (Nm) ............... 30.0-36.0 (41.0-49.0)

________________________________________________________________________________________

• Shibaura Engines Specs
  
• Shibaura N843 Specs
  
• Shibaura N843L Specs
  
• Shibaura N844 Specs
  
• Shibaura N844L Specs
  
• Shibaura N844LT Specs
  
• Shibaura N844T Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________