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Shibaura T853A Engine

The Shibaura T853A is a heavy-duty, 1702 cc (103.9 cu-in) straight-3, vertical diesel engine designed for agricultural and industrial applications. Manufactured by Shibaura, this naturally aspirated power unit is notably utilized in Ford 1910 compact utility tractors produced between 1983 and 1986. It is engineered with a cast-iron block and an indirect fuel injection system, optimized for reliability and high torque output under heavy operating loads. The engine features an inline, 3-cylinder configurations with a vertical design configuration. It utilizes a high-compression diesel cycle with indirect injection into a pre-combustion chamber to ensure complete fuel atomization and smooth combustion characteristics. This model is strictly naturally aspirated and is not designed for turbocharging modifications.

Fuel System: Indirect Injection (IDI) utilizing a swirl or pre-combustion chamber design. Injection Pump: Inline mechanical injection pump timed to the engine camshaft. Injection Timing: 23.5 to 24.5 degrees Before Top Dead Center (BTDC). Injection Opening Pressure: 11760 kPa (117.6 bar / 1705 psi). Fuel Filtration: Primary fuel filter assembly featuring an integrated water separator element.

Valve Configuration: Overhead valve (OHV) mechanism driven by a gear-train-actuated camshaft. Valves: 2 valves per cylinder (1 intake, 1 exhaust). Cylinder Bore: 85.0 mm (3.35 in). Piston Stroke: 100.0 mm (3.94 in). Compression Ratio: 21.0:1. Lubrication System: Forced feed lubrication via a trochoid oil pump with a full-flow cartridge oil filter. Oil Specification: API Service Classification CD or CE. Cooling System: Forced liquid circulation via a belt-driven centrifugal water pump. Thermal Regulation: Thermostat-controlled bypass loop with a pressurized radiator and cooling fan assembly.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura T853A
Engine Type ............... 4-cycle inline 3-cylinder indirect injection liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.35 (85.0)
Engine Stroke, in (mm) ............... 3.94 (100.0)
Displacement, cu.in (L) ............... 103.8 (1.702)
Rated Engine Power, hp (kW) ............... 32.0 (23.9)
Rated Engine Speed, rpm ............... 2500
Peak Torque ............... 96.1 Nm (70.9 lb-ft) at 2000 rpm
Idle Speed, rpm ............... 750-850
Max No-Load Speed, rpm ............... 2700-2800
Aspiration Type ............... Naturally Aspirated
Operating Speed, rpm ............... 2500
Compression Ratio ............... 21.0:1
Firing Order ............... 1-2-3
Direction of Rotation ............... Counter-clockwise facing flywheel
Combustion Chamber ............... Indirect injection
Camshaft Drive Type ............... Helical gear driven train
Main Bearings Number ............... 4 journal journals
Crankshaft Material ............... Forged steel induction hardened
Valves per Cylinder ............... 2 (1 intake, 1 exhaust)
Cylinder Block Type ............... Monoblock cast iron
Cylinder Head Type ............... One-piece cast iron
Lubrication System ............... Full-pressure feed
Oil Pump Type ............... Trochoid type, gear-driven
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Forced circulation liquid cooling
Water Pump Type ............... Belt-driven centrifugal pump
Cooling Fan Type ............... Suction or pusher type belt-driven
Air Cleaner Type ............... Dry element with primary and safety stages
Starting System ............... Electric starter motor
Pre-heating System ............... Glow plugs
Electrical System ............... 12V
Charging System ............... Alternator
Alternator Output ............... 35A

Fuel System

Fuel Injection Pump Type ............... Inline Bosch-type mini pump assembly
Fuel Injection Timing ............... 23.5-24.5 degrees BTDC
Injection Timing Method ............... Shim thickness adjustment delivery port timing
Fuel Injector Type ............... Throttle nozzle pintle type
Injector Opening Pressure, psi (kPa) ............... 1705 (11760)
Governor Type ............... Mechanical centrifugal type
Fuel Transfer Pump Type ............... Mechanical diaphragm plunger type
Fuel Filter Type ............... Spin-on element with water separator sedimenter bowl
Fuel Feed Line Diameter, in (mm) ............... 0.236 (6.0)
Fuel Return Line Diameter, in (mm) ............... 0.196 (5.0)
Maximum Fuel Pump Lift, ft (m) ............... 3.28 (1.0)
Maximum Fuel Inlet Restriction, in Hg (kPa) ............... 3.93 (13.3)
Maximum Fuel Return Restriction, in Hg (kPa) ............... 5.90 (20.0)
Recommended Fuel Grade ............... Ultra-low sulfur diesel ASTM D975 No. 2-D
Fuel Cetane Requirement ............... Minimum 45 cetane level index rating
Injection Pump Lubrication ............... Splash fed internal sump engine oil supply

Dimensions and Weight

Overall Length, in (mm) ............... 22.44 (570)
Overall Width, in (mm) ............... 18.89 (480)
Overall Height, in (mm) ............... 24.80 (630)
Dry Weight, lbs (kg) ............... 365 (165)
Wet Weight, lbs (kg) ............... 393 (178)

Maintenance Data

Service Information

Compression Pressure (Standard), psi (kPa) ............... 426 (2941
Compression Pressure (Minimum), psi (kPa) ............... 355 (2451)
Compression Pressure Between Cylinders, psi (kPa) ............... 28 (196)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.6-56.8 (294-392)
Radiator Pressure Cap Rating, psi (kPa) ............... 12.8 (88.2)
Thermostat Start-to-Open Temperature, F (C) ............... 160 (71)
Thermostat Full-Open Temperature, F (C) ............... 185 (85)
Fan Belt Deflection Under 22 lb Force, in (mm) ............... 0.39-0.47 (10.0-12.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.012 (0.30)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CD, CE, CF, CF-4
Engine Oil Capacity with Filter, qts (L) ............... 6.9 (6.5)
Engine Oil Capacity without Filter, qts (L) ............... 6.1 (5.8)
Cooling System Capacity, qts (L) ............... 7.4 (7.0)

Service Intervals

Change oil and filter ............... Every 100 hours
Inspect air cleaner ............... Every 100 hours
Replace air cleaner ............... Every 500 hours
Replace fuel filter ............... Every 200 hours
Valve clearance adjustment ............... Every 400 hours
Fuel system inspection ............... Every 600 hours
Change coolant ............... Every 1000 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) ............... 3.3464-3.3472 (85.000-85.022)
Cylinder Bore Maximum Out-of-Round, in (mm) ............... 0.0078 (0.200)
Cylinder Bore Maximum Taper Tapering, in (mm) ............... 0.0039 (0.100)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1031-1.1039 (28.020-28.040)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6755-2.6760 (67.960-67.975)
Main Bearing Oil Clearance, in (mm) ............... 0.0015-0.0033 (0.040-0.085)
Crankpin Journal Diameter, in (mm) ............... 2.0458-2.0463 (51.964-51.975)
Connecting Rod Bearing Oil Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft End Play, in (mm) ............... 0.0043-0.0098 (0.110-0.250)
Piston Skirt Outside Diameter, in (mm) ............... 3.3429-3.3437 (84.910-84.930)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0027-0.0044 (0.070-0.112)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1024-1.1027 (28.000-28.008)
Piston Pin Outside Diameter, in (mm) ............... 1.1021-1.1023 (27.992-28.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0006 (0.000-0.016)
Piston Pin to Connecting Rod Bushing Clearance, in (mm) ............... 0.0007-0.0018 (0.020-0.048)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Oil Ring Groove Width, in (mm) ............... 0.1582-0.1590 (4.020-4.040)
Top Ring Groove Side Clearance, in (mm) ............... 0.0027-0.0041 (0.070-0.105)
Second Ring Groove Side Clearance, in (mm) ............... 0.0019-0.0033 (0.048-0.085)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0009-0.0025 (0.025-0.065)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Second Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Oil Ring End Gape, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Deck Surface Flatness, in (mm) ............... 0.0019 (0.050)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.3129-0.3135 (7.950-7.965)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.3118-0.3125 (7.920-7.940)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.3149-0.3156 (8.000-8.018)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.3149-0.3156 (8.000-8.018)
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 Head Thickness, in (mm) ............... 0.0393-0.0472 (1.000-1.200)
Valve Seat Angle ............... 45 degrees
Valve Seat Width, in (mm) ............... 0.0472-0.0590 (1.200-1.500)
Valve Spring Free Length, in (mm) ............... 1.6535 (42.00)
Camshaft Journal Diameter (Front), in (mm) ............... 1.8484-1.8492 (46.950-46.970)
Camshaft Journal Diameter (Middle), in (mm) ............... 1.8090-1.8098 (45.950-45.970)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.7700-1.7708 (44.960-44.980)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Intake Cam Lobe Height, in (mm) ............... 1.4114-1.4133 (35.850-35.900)
Exhaust Cam Lobe Height, in (mm) ............... 1.4133-1.4153 (35.900-35.950)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.5893-0.5901 (14.970-14.990)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.5905-0.5912 (15.000-15.018)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0003-0.0018 (0.010-0.048)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Idler Gear Bushing Internal Diameter, in (mm) ............... 1.5748-1.5757 (40.000-40.025)
Idler Gear Bushing Radial Clearance, in (mm) ............... 0.0007-0.0025 (0.020-0.065)

Tightening Torques

Cylinder Head Bolts ............... 68.5-72.3 lb-ft (93.0-98.0 Nm)
Connecting Rod Cap Nut ............... 36.1-39.7 lb-ft (49.0-54.0 Nm)
Main Bearing Cap Bolts ............... 36.1-39.7 lb-ft (49.0-54.0 Nm)
Flywheel Rear Fastener Screws ............... 41.3-50.9 lb-ft (56.0-69.0 Nm)
Crankshaft Front Pulley Damper Hub Bolt ............... 36.2-43.5 lb-ft (49.0-59.0 Nm)
Rocker Arm Shaft Support Bracket Fasteners ............... 20.3-25.3 lb-ft (27.5-34.3 Nm)
Intake Manifold Securing Side Flange Cap Screws ............... 13.0-17.3 lb-ft (17.6-23.5 Nm)
Exhaust Manifold Structural Hot Side Mounting Nuts ............... 18.0-21.6 lb-ft (24.5-29.4 Nm)
Fuel Injector Assembly Body Clamp Fasteners ............... 43.3-50.6 lb-ft (58.8-68.6 Nm)
Fuel Injection Pump Delivery Valve Holder Fittings ............... 28.9-32.5 lb-ft (39.2-44.1 Nm)
High Pressure Fuel Injection Delivery Tube Nut ............... 18.0-21.6 lb-ft (24.5-29.4 Nm)
Oil Pan Sump Lower Outer Flange Screws ............... 7.2-9.4 lb-ft (9.8-12.7 Nm)
Oil Sump Drain Plug ............... 43.3-57.8 lb-ft (58.8-78.4 Nm)
Camshaft Thrust Plate Front Bearing Screw ............... 7.2-10.8 lb-ft (9.8-14.7 Nm)
Camshaft Driven Gear Center Timing Bolt ............... 43.3-50.6 lb-ft (58.8-68.6 Nm)
Timing Gear Case Front Cover Screws ............... 13.0-17.3 lb-ft (17.6-23.5 Nm)
Flywheel Housing Back Plate Interface Bolts ............... 36.1-43.3 lb-ft (49.0-58.8 Nm)
Water Pump Assembly Front Housing Flange Bolts ............... 13.0-17.3 lb-ft (17.6-23.5 Nm)
Thermostat Housing Top Water Outlet Cover Fasteners ............... 13.0-17.3 lb-ft (17.6-23.5 Nm)
Glow Plug Individual Electrical Heater Cylinder Core Packs ............... 10.8-14.4 lb-ft (14.7-19.6 Nm)
Oil Pressure Sensor Sending Warning Switch Unit Base ............... 10.8-14.4 lb-ft (14.7-19.6 Nm)
Water Temperature Sender Transmitter Gauge Adapter ............... 14.4-18.0 lb-ft (19.6-24.5 Nm)
Alternator Pivot Mount Foundation Support Bolt ............... 25.3-32.5 lb-ft (34.3-44.1 Nm)
Alternator Adjusting Slide Strap Lock Bolt ............... 13.0-17.3 lb-ft (17.6-23.5 Nm)
Starter Motor Flange Ring Gear Mount Bolts ............... 36.1-43.3 lb-ft (49.0-58.8 Nm)
Valve Cover Top Rocker Casing Acorn Nuts ............... 5.0-7.2 lb-ft (6.8-9.8 Nm)
Fuel Filter Bracket Main Engine Block Fasteners ............... 18.0-25.3 lb-ft (24.5-34.3 Nm)
Fuel Injection Pump Housing Flange Mounting Nuts ............... 14.4-18.0 lb-ft (19.6-24.5 Nm)

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• Shibaura Engines Specs
  
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• Shibaura T854B Specs
  

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