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Shibaura N844T Engine

The Shibaura N844T is a vertical, four-stroke, four-cylinder, liquid-cooled, turbocharged industrial diesel engine. Featuring a heavy-duty cast-iron cylinder block and rugged internal components, it is widely utilized in compact industrial equipment, agricultural machinery, and skid steers, such as the New Holland LS170 and L218. The engine is engineered for high durability, extended service life, and straightforward maintenance, with key service access points concentrated primarily on the right-hand side.

Total Displacement: 1.995 liters (121.7 cubic inches). Cylinder Bore: 84.00 mm (3.30 inches). Piston Stroke: 90.00 mm (3.54 inches). Compression Ratio: 22.0:1 to 22.5:1. Valve Configuration: Overhead Valve (OHV) layout actuated via pushrods and rocker arms. Number of Valves: 2 valves per cylinder (4 intake valves, 4 exhaust valves; 8 total).

Fuel System: Indirect injection (IDI) utilizing pre-combustion chambers. Injection Pump: In-line jerk-type mechanical injection pump driven by the engine camshaft timing gear. Fuel Control: Mechanical governor regulation with an integrated 12V electrical fuel shut-off solenoid controlling the fuel rack cut-off. Cold Start Assist: Glow plugs installed directly into the pre-combustion chambers of the cylinder head.

Lubrication System Type: Forced pressure lubrication driven by a trochoid-type oil pump. Oil Specification: API classification SH/CG4 or higher. Pressure Regulation: Relieved via an integrated oil pressure regulator valve and monitored through a block-mounted electrical oil pressure switch. Cooling System: Forced-circulation liquid cooling system managed by a belt-driven centrifugal water pump. Thermostat: Inline wax-pellet type designed to regulate optimum operational engine temperature.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura N844T
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) ............... 3.54 (90.0)
Displacement, cu.in (L) ............... 121.7 (1.995)
Rated Engine Power, hp (kW) ............... 45-52 (34-39)
Rated Engine Speed, rpm ............... 2600-2900
Peak Torque ............... 130-150 Nm (96-111 lb-ft) at 1700-1800 rpm
Idle Speed ............... 800-950 rpm
Aspiration Type ............... Turbocharged
Operating Speed ............... 2600 rpm
Compression Ratio ............... 22.5:1
Firing Order ............... 1-3-4-2
Rotation Direction ............... Counterclockwise viewed from flywheel side
Combustion Chamber ............... Swirl chamber type indirect injection
Main Bearing Type ............... Steel-backed tri-metal liners
Camshaft Drive ............... Helical gear driven train
Valves per Cylinder ............... 2 overhead valves
Crankcase Ventilation ............... Closed breather system
Cylinder Block Type ............... Cast iron monoblock
Cylinder Head Type ............... Cast iron single piece
Lubrication System ............... Forced pressure lubrication by trochoid gear pump
Oil Pump Type ............... Trochoid gear driven from crankshaft
Oil Filter Type ............... Full-flow, spin-on cartridge element
Cooling System ............... Liquid-cooled forced circulation
Water Pump Type ............... Belt-driven centrifugal type
Air Cleaner Type ............... Dry dual-element type
Starting System ............... Electric starter motor with glow plug preheating
Electrical System ............... 12V DC
Alternator Capacity, A ............... 40 or 55

Fuel System

Fuel Injection Pump Type ............... Bosch in-line cassette type PFR pump
Fuel Injector Type ............... Throttle type nozzle structure
Injection Timing, deg BTDC ............... 20-22
Injection Pressure, MPa (psi) ............... 14.7 (2133)
Fuel Transfer Pump Type ............... Mechanical diaphragm type pump
Fuel Filter Type ............... Cartridge spin-on water separator type element
Fuel Return System ............... Spill pipe connection to fuel tank cavity
Maximum Fuel Inlet Restriction, kPa (in.Hg) ............... 10.3 (3.04)
Maximum Fuel Return Pipe Back Pressure, kPa (in.Hg) ............... 20.0 (5.9)
Fuel Specification ............... ASTM D975 No.2-D ultra-low sulfur diesel fuel oil
Fuel Consumption at Rated Power, g/kWh (lb/hph) ............... 245 (0.403)
Fuel Leakage Collection Line ............... Integrated steel overflow tube network
Governor Type ............... Mechanical all-speed centrifugal flyweight
Nozzle Opening Pressure, MPa (psi) ............... 14.7-15.6 (2132-2262)
Fuel Feed Pump Discharge Pressure, kPa (psi) ............... 19.6-29.4 (2.84-4.26)
Plunger Diameter, mm (in) ............... 5.5 (0.216)
Plunger Stroke, mm (in) ............... 7.0 (0.275)
Injection Pipe Outer Diameter, mm (in) ............... 6.0 (0.236)
Injection Pipe Inner Diameter, mm (in) ............... 2.0 (0.078)
Injection Pipe Length, mm (in) ............... 400 (15.75)

Dimensions and Weight

Overall Length, in (mm) ............... 24.3 (615)
Overall Width, in (mm) ............... 18.9 (480)
Overall Height, in (mm) ............... 27.6 (700)
Dry Weight, lbs (kg) ............... 419 (190)
Wet Weight, lbs (kg) ............... 445 (202)

Maintenance Data

Service Information

Standard Compression Pressure, MPa (psi) ............... 2.94 (426)
Maximum Compression Between Cylinders, MPa (psi) ............... 0.20 (29)
Engine Oil Pressure at Low Idle, kPa (psi) ............... 120-200 (17.4-29.0)
Engine Oil Pressure at Rated Speed, kPa (psi) ............... 294-441 (42.6-64.0)
Thermostat Start-to-Open Temperature, C (F) ............... 79-82 (174-180)
Thermostat Maximum Wide Open Temperature, C (F) ............... 95 (203)
Radiator Pressure Cap Relief Valve, kPa (psi) ............... 88.2 (12.8)
Turbocharger Max Boost Pressure, kPa (psi) ............... 68-88 (9.8-12.7)
Fan Belt Deflection Standard Tension, in (mm) ............... 0.28-0.39 (7.0-10.0)
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, Max, qt (L) ............... 8.5 (8.0)
Engine Oil Capacity, Min, qt (L) ............... 6.3 (6.0)
Cooling System Capacity, qt (L) ............... 7.4 (7.0)

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 2000 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Internal Diameter, mm (in) ............... 84.000-84.019 (3.3071-3.3078)
Cylinder Bore Out-of-Round, mm (in) ............... 0.050 (0.0020)
Con Rod Small End Bushing Internal Bore, mm (in) ............... 28.012-28.025 (1.1028-1.1033)
Crankshaft Main Journal Diameterd, mm (in) ............... 67.955-67.970 (2.6754-2.6759)
Crankshaft Main Bearing Clearance, mm (in) ............... 0.044-0.102 (0.0017-0.0040)
Crankpin Journal Diameter, mm (in) ............... 51.964-51.975 (2.0458-2.0462)
Crankpin Bearing Oil Clearance, mm (in) ............... 0.035-0.085 (0.0013-0.0033)
Crankshaft End Play, mm (in) ............... 0.110-0.210 (0.0043-0.0082)
Crankshaft Thrust Washer Thickness, mm (in) ............... 2.940-2.990 (0.1157-0.1177)
Piston Skirt External Diameter, mm (in) ............... 83.948-83.963 (3.3050-3.3056)
Piston to Cylinder Wall Clearance, mm (in) ............... 0.037-0.071 (0.0014-0.0028)
Piston Pin Bore Internal Diameter, mm (in) ............... 28.002-28.011 (1.1024-1.1028)
Piston Pin to Piston Pin Bore Clearance, mm (in) ............... 0.002-0.017 (0.0001-0.0006)
Piston Pin to Con Rod Bushing Clearance, mm (in) ............... 0.012-0.031 (0.0004-0.0012)
Top Ring Groove Width, mm (in) ............... 2.060-2.075 (0.0811-0.0817)
Second Ring Groove Width, mm (in) ............... 2.020-2.035 (0.0795-0.0801)
Oil Ring Groove Width, mm (in) ............... 4.015-4.030 (0.1580-0.1586)
Top Ring Groove Side Clearance, mm (in) ............... 0.060-0.095 (0.0023-0.0037)
Second Ring Groove Side Clearance, mm (in) ............... 0.050-0.085 (0.0019-0.0033)
Oil Ring Groove Side Clearanced, mm (in) ............... 0.030-0.065 (0.0011-0.0025)
Top Ring End Gap, mm (in) ............... 0.200-0.350 (0.0078-0.0137)
Second Ring End Gap, mm (in) ............... 0.200-0.400 (0.0078-0.0157)
Oil Ring End Gap, mm (in) ............... 0.200-0.400 (0.0078-0.0157)
Cylinder Head Fire Deck Flatness, mm (in) ............... 0.050 (0.0019)
Intake Valve Stem External Diameter, mm (in) ............... 6.955-6.970 (0.2738-0.2744)
Exhaust Valve Stem External Diameter, mm (in) ............... 6.940-6.955 (0.2732-0.2738)
Intake Valve Guide Bushing Internal Diameter, mm (in) ............... 7.000-7.015 (0.2755-0.2761)
Exhaust Valve Guide Bushing Internal Diameter, mm (in) ............... 7.000-7.015 (0.2755-0.2761)
Intake Valve Stem to Guide Clearance, mm (in) ............... 0.030-0.060 (0.0011-0.0023)
Exhaust Valve Stem to Guide Clearance, mm (in) ............... 0.045-0.075 (0.0017-0.0029)
Valve Face Seating Angle, deg ............... 45
Valve Spring Free Length, mm (in) ............... 35.100 (1.3818)
Camshaft Main Journal Diameter, mm (in) ............... 45.925-45.950 (1.8080-1.8090)
Camshaft Bearing Internal Sleeve Diameter, mm (in) ............... 46.000-46.025 (1.8110-1.8120)
Camshaft Main Journal Oil Clearance, mm (in) ............... 0.050-0.100 (0.0019-0.0039)
Cam Lobe Height (Intake), mm (in) ............... 34.065-34.120 (1.3411-1.3433)
Cam Lobe Height (Exhaust), mm (in) ............... 34.395-34.450 (1.3541-1.3562)
Camshaft End Play, mm (in) ............... 0.100-0.300 (0.0039-0.0118)
Rocker Arm Shaft Outer Diameter, mm (in) ............... 14.950-14.970 (0.5885-0.5893)
Rocker Arm Bushing Internal Bore Diameter, mm (in) ............... 15.000-15.018 (0.5905-0.5912)
Rocker Arm to Shaft Oil Clearance, mm (in) ............... 0.030-0.068 (0.0011-0.0026)
Idler Shaft Main Face Outer Diameter, mm (in) ............... 33.950-33.975 (1.3366-1.3375)
Idler Gear Bearing Liner Inner Diameter, mm (in) ............... 34.000-34.025 (1.3385-1.3395)
Idler Gear Bushing to Shaft Clearance, mm (in) ............... 0.025-0.075 (0.0009-0.0029)

Tightening Torques

Cylinder Head Fastener Bolts (M10), lb-ft (Nm) ............... 72.3-75.9 (98.0-103.0)
Connecting Rod Cap Nuts (M9), lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Main Bearing Carrier Bolts (M10), lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Main Bearing Carrier to Block Bolts (M8), lb-ft (Nm) ............... 21.7-25.3 (29.4-34.3)
Crankshaft Front Pulley Center Nut (M24), lb-ft (Nm) ............... 216.9-224.2 (294.0-304.0)
Flywheel Retaining Bolts (M10), lb-ft (Nm) ............... 50.6-57.9 (68.6-78.5)
Rocker Arm Shaft Assembly Brackets (M8), lb-ft (Nm) ............... 20.0-23.8 (27.1-32.3)
Valve Timing Gear Case Cover Bolts (M6), lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Valve Timing Gear Case Back Plate Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Oil Pan Drain Plug Fitting Thread, lb-ft (Nm) ............... 25.3-32.5 (34.3-44.1)
Oil Pan Perimeter Retaining Bolts (M6), lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Oil Suction Screen Tube Bolt (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Cylinder Head Valve Cover Nuts (M6), lb-ft (Nm) ............... 5.8-7.2 (7.9-9.8)
Intake Manifold Securing Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Exhaust Manifold Securing Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Turbocharger Gas Drive Assembly Nuts, lb-ft (Nm) ............... 18-22 (25-30)
Turbocharger High Feed Supply Tube Bolt, lb-ft (Nm) ............... 15-18 (20-24)
Turbocharger Low Gravity Drainage Pipe Fasteners, lb-ft (Nm) ............... 7-9 (10-12)
Fuel Injector Assembly Retaining Nuts (M20), lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Injection Pipe Union Delivery Nuts (M12), lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Fuel Leak-off Line Banjo Fitting Bolts (M10), lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Fuel Injection Pump Cassette Mounting Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Fuel Injection Pump Delivery Valve Holders, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Glow Plug Terminal Small Hex Nuts (M4), lb-ft (Nm) ............... 0.7-1.1 (1.0-1.5)
Glow Plug Assembly Body Thread (M10), lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Starter Motor Flange Mounting Bolts (M10), lb-ft (Nm) ............... 36.2-43.4 (49.0-58.8)
Alternator Pivoting Mounting Bolt (M10), lb-ft (Nm) ............... 36.2-43.4 (49.0-58.8)
Alternator Tension Link Adjusting Bolt (M8), lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Oil Pressure Switch Sensor Body Thread, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Water Temperature Sender Sensor Thread, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Cooling Fan Blade Retaining Bolts (M6), lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Thermostat Housing Water Outlet Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)
Water Pump Assembly Retaining Bolts (M8), lb-ft (Nm) ............... 17.4-21.7 (23.5-29.4)

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• Shibaura Engines Specs
  
• Shibaura N843 Specs
  
• Shibaura N843L Specs
  
• Shibaura N843T-F Specs
  
• Shibaura N844 Specs
  
• Shibaura N844L Specs
  
• Shibaura N844LT Specs
  

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