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Shibaura N844LT Engine

The Shibaura N844LT (also designated as N844L-T) is an industrial, vertical, water-cooled, 4-stroke, 4-cylinder turbocharged diesel engine engineered by IHI Shibaura Machinery Corporation. It features a robust design widely deployed in agricultural and construction equipment, including compact tractors, skid-steer loaders, and excavators. Known for its durability and high torque-to-weight ratio, this engine complies with Tier 3 / Stage IIIB emissions standards depending on the production series, incorporating an overhead valve configuration and an efficient indirect or common-rail direct injection system optimized for industrial load cycles.

Valve Configuration: Overhead Valve (OHV) layout with a single gear-driven camshaft acting on pushrods and rocker assemblies. Valves per cylinder: 2 valves per cylinder (1 intake, 1 exhaust). Adjustment interval: Standard workshop service requirement dictates adjustment every 1000 operating hours or upon detecting abnormal rocker mechanism noise. Cylinder bore diameter: 84.00 mm (3.307 inches). Piston stroke length: 100.00 mm (3.543 inches). Total engine displacement: 2.216 liters (135.2 cubic inches).

Lubrication System: Full-pressure feed lubrication driven by a trochoid-type oil pump. Filtration: Full-flow, spin-on cartridge-style oil filter element. Monitoring: Integrated oil pressure warning switch connected to a dash indicator lamp, shutting down or alerting upon pressure loss below safe operational limits. Cooling System: Forced circulation liquid cooling using a belt-driven centrifugal water pump. Air flow components: Engine-driven cooling fan pushing or pulling air through a heavy-duty radiator matrix, regulated by an internal wax-pellet thermostat to maintain a stable operational temperature boundary.

Fuel System: Mechanical inline/Bosch-type multi-plunger mini injection pump. Induction type: Turbocharged forced induction to boost volumetric efficiency. Delivery pipeline: Low-pressure supply lines feed from the fuel tank through a primary fuel filter and water sediment separator assembly. High-pressure steel lines route from the injection pump directly to individual fuel injectors. Shut-off mechanism: Electronic fuel cutoff solenoid managing fuel rack protrusion for positive engine shutdown.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura N844LT
Engine Type ............... 4-cycle inline 4-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.31 (84.0)
Engine Stroke, in (mm) ............... 3.94 (100.0)
Displacement, cu.in (L) ............... 135.2 (2.216)
Rated Engine Power, hp (kW) ............... 55-60 (41-45)
Rated Engine Speed, rpm ............... 2500-2800
Peak Torque ............... 165-175 Nm (122-129 lb-ft) at 1600-1800 rpm
Idle Speed ............... 850-950 rpm
Aspiration Type ............... Turbocharged
Operating Speed ............... 2500 rpm
Compression Ratio ............... 23.3:1
Firing Order ............... 1-3-4-2
Rotation Direction ............... Counterclockwise looking at flywheel
Combustion Chamber ............... Direct injection re-entrant bowl
Camshaft Drive Type ............... Helical gear driven
Main Bearings Number ............... 5
Connecting Rod Material ............... Forged carbon steel
Valve Mechanism ............... Overhead valve actuated by pushrods
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Turbocharger Model ............... IHI or equivalent
Turbocharger Lubrication ............... Engine pressure oil feed lines
Turbocharger Cooling ............... Oil cooled structural assembly
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric Starter
Electrical System ............... 12V
Alternator Capacity, A ............... 40-55

Fuel System

Fuel Injection Pump Type ............... In-line cassette pump
Fuel Injection Pump Manufacturer ............... Bosch or Shibaura design
Governor Type ............... Mechanical centrifugal flyweight
Fuel Injector Nozzle Type ............... Multi-hole nozzle atomizer
Injection Pressure, psi (bar) ............... 2132-2275 (147-157)
Fuel Transfer Pump Type ............... Mechanical plunger diaphragm lift pump
Fuel Lift Pump Pressure, psi (bar) ............... 3.6-5.8 (0.25-0.40)
Fuel Filter Type ............... Spin-on element with integrated water separator
Recommended Fuel Grade ............... Ultra Low Sulfur Diesel No. 2-D
Fuel Injection Timing ............... 16-18 degrees BTDC
Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Leak-off System ............... Common rail spill line to tank
Fuel Tank Venting Requirement ............... Unrestricted open atmosphere breather
Fuel Solenoid Type ............... Energized-to-run mechanical stop design
Governor Housing Seal Type ............... O-ring rubber gasket
Fuel Pump Spill Timing Position ............... Center line alignment mark
Fuel System Priming Method ............... Manual lever on lift pump assembly
Fuel Delivery Valve Opening Pressure, psi (bar) ............... 435 (30)
Fuel Injector Washer Material ............... Solid soft copper sheet metal
Maximum Allowable Fuel Aeration ............... Zero bubbles visible in lines
Fuel Injection Pump Spill Timing, deg ............... 17 degrees BTDC

Dimensions and Weight

Overall Length, in (mm) ............... 25.8 (655)
Overall Width, in (mm) ............... 19.7 (500)
Overall Height, in (mm) ............... 29.1 (739)
Dry Weight, lbs (kg) ............... 448 (203)
Wet Weight, lbs (kg) ............... 472 (214)

Maintenance Data

Service Information

Compression Pressure, psi (MPa) ............... 426 (2.94)
Minimum Compression Pressure, psi (MPa) ............... 355 (2.45)
Maximum Cylinder Pressure Variance, psi (MPa) ............... 28 (0.19)
Oil Pressure at Rated Speed, psi (bar) ............... 43-64 (3.0-4.4)
Oil Pressure at Low Idle, psi (bar) ............... 14.2 (1.0)
Oil Pressure Relief Valve Setting, psi (bar) ............... 71 (4.9)
Radiator Cap Pressure Rating, psi (bar) ............... 13.0 (0.9)
Normal Operating Oil Temperature, F (C) ............... 194-230 (90-110)
Normal Operating Coolant Temperature, F (C) ............... 176-194 (80-90)
Thermostat Opening Temperature, F (C) ............... 160 (71)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
Cooling Fan Belt Deflection, in (mm) ............... 0.31-0.39 (8.0-10.0)
Intake Valve Lash, Cold, in (mm) ............... 0.008 (0.20)
Exhaust Valve Lash, Cold, in (mm) ............... 0.008 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CH-4, CG-4, CF-4, or CI-4
Engine Oil Capacity with Filter, qt (L) ............... 8.7 (8.2)
Engine Oil Capacity without Filter, qt (L) ............... 7.9 (7.5)
Coolant Capacity, Engine Only, qt (L) ............... 3.5 (3.3)
Coolant Capacity with Radiator, qt (L) ............... 8.5 (8.0)

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 1000 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Standard Diameter, in (mm) ............... 3.3071-3.3083 (84.000-84.030)
Cylinder Bore Wear Limit, in (mm) ............... 3.3150 (84.200)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.955-67.967)
Crankshaft Main Journal Wear Limit, in (mm) ............... 2.6692 (67.800)
Crankshaft End Play, in (mm) ............... 0.0020-0.0068 (0.052-0.175)
Crankpin Journal Diameter, in (mm) ............... 2.0458-2.0463 (51.964-51.975)
Crankpin Journal Wear Limit, in (mm) ............... 2.0393 (51.800)
Crankpin Bearing Shell to Journal Clearance, in (mm) ............... 0.0013-0.0033 (0.035-0.085)
Main Bearing Shell to Journal Clearance, in (mm) ............... 0.0015-0.0035 (0.039-0.090)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1031-1.1039 (28.020-28.040)
Connecting Rod Bearing Journal Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 3.3043-3.3051 (83.930-83.950)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0020-0.0039 (0.050-0.100)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1024-1.1028 (28.000-28.010)
Piston Pin Outer Diameter, in (mm) ............... 1.1020-1.1024 (27.990-28.000)
Piston Pin to Bore Clearance, in (mm) ............... 0.0000-0.0008 (0.000-0.020)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0791-0.0799 (2.010-2.030)
Oil Ring Groove Width, in (mm) ............... 0.1578-0.1586 (4.010-4.030)
Top Ring Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Second Ring Side Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Oil Ring Side Clearance, in (mm) ............... 0.0008-0.0024 (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)
Cylinder Head Surface Distortion Flatness, in (mm) ............... 0.0019 (0.050)
Intake Valve Diameter, in (mm) ............... 1.34 (34.0)
Exhaust Valve Diameter, in (mm) ............... 1.18 (30.0)
Intake Valve Stem Length, in (mm) ............... 4.53 (115.0)
Exhaust Valve Stem Length, in (mm) ............... 4.55 (115.5)
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) ............... 0.0013-0.0025 (0.035-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0037 (0.060-0.095)
Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Valve Seat Contact Width, in (mm) ............... 0.0590-0.0826 (1.500-2.100)
Valve Seat Angle ............... 45 degrees
Valve Spring Free Length, in (mm) ............... 1.7716 (45.000)
Camshaft Main Journal Diameter (Front), in (mm) ............... 1.8484-1.8492 (46.950-46.970)
Camshaft Main Journal Diameter (Middle), in (mm) ............... 1.8287-1.8295 (46.450-46.470)
Camshaft Main Journal Diameter (Rear), in (mm) ............... 1.8090-1.8098 (45.950-45.970)
Camshaft Bushing Clearance, in (mm) ............... 0.0011-0.0035 (0.030-0.090)
Intake Cam Lobe Height, in (mm) ............... 1.3411-1.3435 (34.065-34.125)
Exhaust Cam Lobe Height, in (mm) ............... 1.3431-1.3454 (34.115-34.175)
Camshaft Axial End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4712-0.4720 (11.968-11.990)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4736 (12.000-12.030)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0003-0.0024 (0.010-0.062)
Idle Gear Shaft Outer Diameter, in (mm) ............... 1.3366-1.3374 (33.950-33.970)
Idle Gear Bushing Inner Diameter, in (mm) ............... 1.3385-1.3395 (34.000-34.025)
Idle Gear to Shaft Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)

Tightening Torques

Cylinder Head Bolts (M12), lb-ft (Nm) ............... 72-76 (98-103)
Connecting Rod Cap Nuts (M10), lb-ft (Nm) ............... 36-40 (49-54)
Main Bearing Carrier Cap Bolts, lb-ft (Nm) ............... 36-40 (49-54)
Main Bearing Carrier to Cylinder Block, lb-ft (Nm) ............... 22-25 (30-34)
Crankshaft Front Pulley Central Nut, lb-ft (Nm) ............... 213-221 (289-300)
Flywheel Retaining Bolts, lb-ft (Nm) ............... 52-55 (71-75)
Camshaft Retaining Thrust Plate Fastener, lb-ft (Nm) ............... 14-17 (19-23)
Timing Gear Housing Front Plate Sealing Wall, lb-ft (Nm) ............... 14-17 (19-23)
Timing Gear Idle Shaft Retaining Bolt, lb-ft (Nm) ............... 22-26 (30-35)
Rocker Arm Shaft Bracket Base Stud, lb-ft (Nm) ............... 20-24 (27-33)
Rocker Arm Adjusting Nut, lb-ft (Nm) ............... 10-13 (14-18)
Valve Rocker Shield Top Cover Nut, lb-ft (Nm) ............... 7-9 (10-12)
Intake Manifold Flange Fastening Studs, lb-ft (Nm) ............... 14-17 (19-23)
Exhaust Manifold Flange Fastening Studs, lb-ft (Nm) ............... 18-22 (25-30)
Turbocharger Mounting Inlet Flange Joint Base, lb-ft (Nm) ............... 18-22 (25-30)
Oil Pan Sump Flange Mounting Fastener, lb-ft (Nm) ............... 7-9 (10-12)
Oil Pan Bottom Central Hex Drain Plug, lb-ft (Nm) ............... 22-29 (30-39)
Oil Pressure Monitoring Switch Thread Unit, lb-ft (Nm) ............... 11-15 (15-20)
Oil Pressure Internal Relief Valve Cap Assembly, lb-ft (Nm) ............... 44-51 (59-69)
Oil Pump Internal Assembly Cover Screws Set, lb-ft (Nm) ............... 6-8 (8-11)
Water Pump Pulley Base Hub Screws, lb-ft (Nm) ............... 7-9 (10-12)
Water Pump Housing Face Mount Bolts, lb-ft (Nm) ............... 14-17 (19-23)
Thermostat Outer Fitting Cap Adapter Bolt, lb-ft (Nm) ............... 14-17 (19-23)
Cooling Fan Component Drive Flange Mount, lb-ft (Nm) ............... 7-9 (10-12)
Fuel Injector Nut, lb-ft (Nm) ............... 44-51 (59-69)
Injection Pipe Joint, lb-ft (Nm) ............... 17-27 (23-36)
Fuel Leak-off Nut, lb-ft (Nm) ............... 20-25 (27-34)
Fuel Injection Pump Delivery Valve, lb-ft (Nm) ............... 26-30 (35-41)
Fuel Injection Pump Gear Mount Center Nut, lb-ft (Nm) ............... 44-51 (59-69)
Fuel Injection Pump Outer Flange Clamp Nut, lb-ft (Nm) ............... 14-17 (19-23)
Engine Electric Glow Plug, lb-ft (Nm) ............... 11-15 (15-20)
Engine Stop Solenoid Shutoff Mount, lb-ft (Nm) ............... 11-18 (15-25)
Coolant Temperature Sensor, lb-ft (Nm) ............... 11-15 (15-20)
Speed Crank Pick-up Inductive Sensor, lb-ft (Nm) ............... 4-6 (6-8)
Starter Motor Flange Block Mounting, lb-ft (Nm) ............... 33-40 (45-54)
Alternator Support Bracket Pivot Long Bolt, lb-ft (Nm) ............... 33-40 (45-54)
Alternator Locking Tension Slider Adjuster Bolt, lb-ft (Nm) ............... 14-17 (19-23)
Oil Strainer Pick-up Tube Flange Block Connection, lb-ft (Nm) ............... 7-9 (10-12)
Injection Pump Cover Plates, lb-ft (Nm) ............... 4-6 (5-8)
Fuel Filter Mounting Bracket Iron Block Studs, lb-ft (Nm) ............... 22-26 (30-35)
Exhaust Pipe Discharging Elbow Adapter Collar, lb-ft (Nm) ............... 18-22 (25-30)
Turbocharger Wastegate Actuator Bracket Arm Screw, lb-ft (Nm) ............... 6-8 (8-11)
Air Intake Plenum Tube Clamping Band Bolt, lb-ft (Nm) ............... 3-4 (4-5)
Oil Feed Pipe Turbocharger Connection Bolt, lb-ft (Nm) ............... 14-17 (19-23)
Oil Return Drain Pipe Turbocharger Flange Bolt, lb-ft (Nm) ............... 7-9 (10-12)
Timing Gear Backing Plate Plate To Block (M8), lb-ft (Nm) ............... 14-17 (19-23)

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• Shibaura Engines Specs
  
• Shibaura N843 Specs
  
• Shibaura N843L Specs
  
• Shibaura N843T-F Specs
  
• Shibaura N844 Specs
  
• Shibaura N844L Specs
  
• Shibaura N844T Specs
  

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