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Shibaura N844L Engine

The Shibaura N844L is a heavy-duty, vertical, in-line 4-stroke, 4-cylinder diesel engine. Developed under the partnership between ISM Shibaura and major global equipment manufacturers (frequently cross-referenced with the Perkins 404D-22 or CAT C2.2 platforms), this naturally aspirated power unit is designed for compact industrial, agricultural, and construction machinery. It is prominently utilized in applications such as New Holland and Case IH skid steers, sub-compact tractors, and commercial generators. The engine is known for a rigid block design, high thermal efficiency, low noise emissions, and compliance with Tier 3/Tier 4 emission structures depending on production year.

Valve Configuration: Overhead valve (OHV) setup driven by a side-mounted camshaft via pushrods and rocker assemblies. Valves per cylinder: 2 valves per cylinder (1 intake, 1 exhaust). Cylinder arrangement: 4 cylinders arranged vertically in-line. Bore diameter: 84.0 mm. Stroke length: 100.0 mm. Total engine displacement: 2.216 liters (135 cubic inches). Compression ratio: 23.3:1. Cooling System: Forced liquid-circulation cooling utilizing an engine-driven centrifugal water pump and radiator matrix. Circulation control: Direct-acting wax pellet thermostat managing flow redirection to bypass circuit during cold engine start phases.

Fuel System: Indirect Injection (IDI) utilizing a specialized swirl-chamber or pre-combustion chamber setup inside the cylinder head. Injection pump: In-line cassette-type high-pressure multi-plunger fuel injection pump mounted directly to the engine cylinder block and timed mechanically via the main gear train. Shutdown mechanism: Managed via an external electronic fuel shut-off solenoid featuring a specific workshop protrusion measurement of 25.5 to 26.4 mm for correct rack engagement. Cold starting aid: High-efficiency sheathed-type glow plugs fitted to each pre-combustion chamber, pulling standard electrical loads with a maximum allowable internal resistance spec of 1.0 ohm.

Lubrication System: Forced pressure lubrication circuit powered by a trochoid-type oil pump driven off the gear train. Filtration: Full-flow, spin-on cartridge element acting as the primary filtration unit. Pressure control: Integrated spring-loaded relief valve on the pump side to bypass oil directly back to the crankcase when system pressure limits are exceeded. Oil pressure monitoring: Electric oil pressure switch designed to trigger a low-pressure warning threshold if pressure drops below 4.25 psi.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura N844L
Engine Type ............... 4-cycle inline 4-cylinder indirect 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) ............... 45.0-47.0 (33.0-35.0)
Rated Engine Speed, rpm ............... 2800-3600
Peak Torque ............... 130-140 Nm (96-103 lb-ft) at 1800 rpm
Idle Speed ............... 800-950 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2800 rpm
Compression Ratio ............... 22.5:1-23.3:1
Firing Order ............... 1-3-4-2
Combustion Chamber ............... Swirl chamber indirect injection
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron overhead valve
Lubrication System ............... Full-pressure forced lubrication
Oil Pump Type ............... Trochoid rotor type gear-driven pump
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Liquid-cooled centrifugal forced circulation
Water Pump Type ............... Belt-driven centrifugal type
Air Cleaner Type ............... Dry element dual-stage element type
Starting System ............... Electric starter motor engagement
Electrical System ............... 12V

Fuel System

Fuel Injection Pump ............... Bosch type in-line mini pump unit
Governor Type ............... Mechanical all-speed centrifugal type governor
Fuel Injection Nozzle ............... Throttle type multi-hole spray pattern nozzle
Fuel Injection Pressure, psi (bar) ............... 1700-1849 (117-127)
Fuel Feed Pump Type ............... Mechanical diaphragm type pump unit
Fuel Filter Type ............... Spin-on element paper cartridge structure type
Fuel System Venting ............... Manual air bleed valve integration configuration
Maximum Fuel Return Flow, gph (L/h) ............... 2.11 (8.0)
Recommended Fuel Grade ............... Ultra-low sulfur diesel ASTM D975 No. 2-D
Cold Weather Fuel Grade ............... ASTM D975 No. 1-D for sub-zero temperatures
Injection Timing, deg BTDC ............... 18-22 degrees before top dead center
Fuel Transfer Pressure, psi (bar) ............... 2.9-4.3 (0.2-0.3)
Fuel Tank Vent System ............... Open atmosphere screened vent cap configuration
Nozzle Cleaning Interval, hr ............... 1000 hours service operational threshold
Fuel Pipe Material ............... High-pressure seamless steel tube assembly

Dimensions and Weight

Overall Length, in (mm) ............... 22.8 (580)
Overall Width, in (mm) ............... 18.5 (470)
Overall Height, in (mm) ............... 25.6 (650)
Dry Weight, lbs (kg) ............... 410 (186)
Wet Weight, lbs (kg) ............... 437 (198)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 426 (29.4)
Oil Pressure at Low Idle, psi (bar) ............... 14.2 (0.98)
Oil Pressure at High Idle, psi (bar) ............... 42.6-56.8 (2.94-3.92)
Radiator Cap Pressure Valve, psi (bar) ............... 12.8 (0.88)
Thermostat Opening Temperature, F (C) ............... 160 (71.0)
Thermostat Full Open Temperature, F (C) ............... 185 (85.0)
Alternator 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 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) ............... 8.0 (7.6)
Engine Oil Capacity Minimum, qt (L) ............... 6.1 (5.8)
Engine Coolant Total Capacity, qt (L) ............... 6.9 (6.5)

Service Intervals

Change oil and filter ............... Every 200 hours
Inspect air cleaner ............... Every 100 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 400 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 Inside Diameter, in (mm) ............... 3.3071-3.3079 (84.000-84.020)
Cylinder Bore Max Wear Limit, in (mm) ............... 3.3150 (84.200)
Cylinder Bore Out of Round, in (mm) ............... 0.0008 (0.020)
Cylinder Bore Taper Wear Limit, in (mm) ............... 0.0008 (0.020)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0020 (0.050)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0020 (0.050)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.957-67.970)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Crankshaft End Play, in (mm) ............... 0.0020-0.0069 (0.050-0.175)
Crankpin Journal Diameter, in (mm) ............... 2.0458-2.0463 (51.964-51.975)
Crankpin Journal Wear Limit, in (mm) ............... 2.0433 (51.900)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0031 (0.035-0.080)
Connecting Rod Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1029-1.1035 (28.014-28.039)
Connecting Rod Big End Bore Diameter, in (mm) ............... 2.1654-2.1661 (55.000-55.020)
Piston Skirt Diameter, in (mm) ............... 3.3043-3.3051 (83.930-83.950)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Piston Pin Outer Diameter, in (mm) ............... 1.1022-1.1026 (27.995-28.005)
Piston Pin Small End Bushing Clearance, in (mm) ............... 0.0004-0.0013 (0.010-0.034)
Piston Pin Bore In Piston Diameter, in (mm) ............... 1.1024-1.1026 (28.000-28.006)
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) ............... 0.0012-0.0028 (0.030-0.070)
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)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2742 (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 Guide Bore In Cylinder Head Casting, in (mm) ............... 0.4331-0.4339 (11.000-11.018)
Intake Valve Seat Contact Width, in (mm) ............... 0.0591-0.0827 (1.500-2.100)
Exhaust Valve Seat Contact Width, in (mm) ............... 0.0591-0.0827 (1.500-2.100)
Valve Face Angle, deg ............... 45
Valve Seat Angle, deg ............... 45
Valve Head Thickness, in (mm) ............... 0.0394-0.0472 (1.000-1.200)
Valve Spring Free Length, in (mm) ............... 1.3780 (35.000)
Camshaft Journal Diameter, in (mm) ............... 1.5728-1.5736 (39.950-39.970)
Camshaft Bearing Internal Clearance, in (mm) ............... 0.0012-0.0035 (0.030-0.090)
Cam Lobe Height (Intake), in (mm) ............... 1.3406-1.3425 (34.050-34.100)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3406-1.3425 (34.050-34.100)
Camshaft End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Tappet Guide Bore In Block Diameter, in (mm) ............... 0.4724-0.4732 (12.000-12.018)
Tappet Body Outer Stem Diameter, in (mm) ............... 0.4697-0.4705 (11.930-11.950)
Tappet Stem to Guide Internal Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.088)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4717-0.4724 (11.982-12.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4732-0.4741 (12.018-12.043)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0007-0.0024 (0.018-0.061)
Idler Gear Shaft Outer Diameter, in (mm) ............... 1.3362-1.3374 (33.940-33.970)
Idler Gear Bushing Inner Diameter, in (mm) ............... 1.3386-1.3402 (34.000-34.040)
Idler Gear Bushing Oil Clearance, in (mm) ............... 0.0012-0.0039 (0.030-0.100)

Tightening Torques

Cylinder Head Structural Bolts, lb-ft (Nm) ............... 72.0-76.0 (98.0-103.0)
Connecting Rod Cap Locking Nuts, lb-ft (Nm) ............... 36.0-40.0 (49.0-54.0)
Crankshaft Main Bearing Carrier Bolts, lb-ft (Nm) ............... 36.0-40.0 (49.0-54.0)
Main Bearing Carrier to Block Fasteners, lb-ft (Nm) ............... 21.0-23.0 (28.5-31.0)
Main Crankshaft Snout Pulley Retention Nut, lb-ft (Nm) ............... 213.0-230.0 (289.0-312.0)
Flywheel Retention Hardware to Hub, lb-ft (Nm) ............... 52.0-56.0 (70.5-76.0)
Flywheel Housing Outer Retaining Bolts, lb-ft (Nm) ............... 34.0-38.0 (46.0-51.5)
Camshaft Thrust Plate Retaining Fasteners, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Rocker Arm Shaft Support Stanchion Bolts, lb-ft (Nm) ............... 21.0-25.0 (28.5-34.0)
Cylinder Head Valve Cover Acorn Cap Nuts, lb-ft (Nm) ............... 7.0-10.0 (9.5-13.5)
Timing Gear Case Cover Plate Fasteners, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Oil Pump Internal Assembly Side Screws, lb-ft (Nm) ............... 7.0-9.0 (9.5-12.0)
Oil Pan Fluid Basin Perimeter Bolts, lb-ft (Nm) ............... 15.0-18.0 (20.5-24.5)
Oil Pan Bottom Drain Plug Element, lb-ft (Nm) ............... 43.0-50.0 (58.5-68.0)
Fuel Injection Pump Mount Flange Nuts, lb-ft (Nm) ............... 15.0-18.0 (20.5-24.5)
Fuel Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 43.0-51.0 (58.5-69.0)
Fuel Injector Assembly Retaining Gland Nut, lb-ft (Nm) ............... 43.0-51.0 (58.5-69.0)
High-Pressure Fuel Lines Compression Nuts, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Fuel Injector Spill Return Pipe Banjo Bolt, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Glow Plug Terminal Heating Elements, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.5)
Water Pump Mounting Housing Bolt Fasteners, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Cooling Fan Pulley Center Hub Bolts, lb-ft (Nm) ............... 7.0-10.0 (9.5-13.5)
Thermostat Housing Outlet Body Fasteners, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Coolant Temp Sender Sensor Core Body, lb-ft (Nm) ............... 18.0-22.0 (24.5-30.0)
Lube Oil Pressure Switch Indicator Sensor, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Intake Manifold Air Channel Supply Bolts, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Exhaust Manifold Gas Collector Stud Nuts, lb-ft (Nm) ............... 21.0-25.0 (28.5-34.0)
Electric Starter Motor Flange Mounting Studs, lb-ft (Nm) ............... 34.0-38.0 (46.0-51.5)
Alternator Pivot Mount Bolt Block Location, lb-ft (Nm) ............... 34.0-38.0 (46.0-51.5)
Alternator Adjustment Strap Locking Bolt, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Engine Support Brackets Block Anchors, lb-ft (Nm) ............... 38.0-45.0 (51.5-61.0)
Oil Pressure Relief Valve Assembly Plug Body, lb-ft (Nm) ............... 29.0-36.0 (39.5-49.0)
Idler Gear Hub Post Shaft Retention Fastener, lb-ft (Nm) ............... 21.0-25.0 (28.5-34.0)
Air Intake Heater Element Base Thread Grid, lb-ft (Nm) ............... 33.0-40.0 (44.5-54.0)
Crankcase Breather Valve Cap Sealing Bolts, lb-ft (Nm) ............... 7.0-10.0 (9.5-13.5)
Fuel Feed Lift Pump Mechanical Flange Nuts, lb-ft (Nm) ............... 11.0-15.0 (15.0-20.5)
Water Drain Cock Core Block Passage Element, lb-ft (Nm) ............... 22.0-29.0 (30.0-39.5)
Oil Filter Internal Thread Spud Adapter Fitting, lb-ft (Nm) ............... 26.0-33.0 (35.5-44.5)
Front Crankshaft Oil Seal Wear Plate Nut, lb-ft (Nm) ............... 11.0-14.0 (15.0-19.0)
Rear Crankshaft Oil Seal Retainer Base Bolts, lb-ft (Nm) ............... 17.0-21.0 (23.0-28.5)
Exhaust Pipe Downpipe Adapter Flange Nuts, lb-ft (Nm) ............... 25.0-33.0 (34.0-44.5)

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• Shibaura Engines Specs
  
• Shibaura N843 Specs
  
• Shibaura N843L Specs
  
• Shibaura N843T-F Specs
  
• Shibaura N844 Specs
  
• Shibaura N844LT Specs
  
• Shibaura N844T Specs
  

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