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Shibaura LEK802D Engine

The Shibaura LEK802D is an 804 cc (49.1 cu in) inline 2-cylinder, vertical, naturally aspirated diesel engine manufactured by Shibaura. Engineered primarily for compact agricultural equipment, it serves as the powertrain for vintage compact tractors like the Ford 1200 and Ford 1300 built between 1979 and 1982, as well as the Shibaura SE1640. This power unit is known for a robust cast-iron block design, utilization of an indirect injection combustion system, and a high compression ratio. In workshop operations, it is considered a straightforward, mechanically governed engine that requires strict attention to fuel filtration and cooling system scaling to maintain long-term reliability.

The cylinder head utilizes an overhead valve (OHV) layout with a total of 4 valves (2 valves per cylinder: 1 intake and 1 exhaust). The valves are actuated via pushrods and rocker arms driven by a gear-driven camshaft located in the cylinder block. The engine operates on a 4-stroke cycle with a mechanical firing order of 2-1. Bore: 80.0 mm (3.15 inches). Stroke: 80.0 mm (3.15 inches). Displacement: 0.804 liters (804 cc / 49.1 cubic inches). Compression Ratio: 23.0:1.

Fuel System: Fuel delivery is engineered around an indirect injection (IDI) design utilizing a Ricardo Comet-type pre-combustion chamber array within the cylinder head. Injection Pump: A mechanical, multi-plunger in-line injection pump is gear-driven from the timing train. The pump meters and delivers highly pressurized fuel to individual throttle-type injection nozzles. Cold Start Assist: Electric glow plugs are integrated directly into the pre-combustion chambers to facilitate low-temperature ignition. Fuel Requirements: Ultra-Low Sulfur Diesel (No. 2-D diesel fuel).

Lubrication is managed via a full-pressure feed system driven by a trochoid oil pump. The system circulates oil through a full-flow spin-on cartridge filter. Oil Specifications: API classification CD or CE grade, with viscosity recommended at SAE 10W-30 or 10W-40 depending on ambient operating temperatures.
Operational Pressure: Standard operational oil pressure at full throttle ranges between 56 PSI, dropping to 49 PSI at hot idle. The engine uses a pressurized, closed-circuit liquid-cooling system. Coolant circulation is forced through the block and cylinder head jackets by a belt-driven centrifugal water pump, regulated by a pellet-type thermostat to maintain optimum operating temperature. Heat rejection is handled by a front-mounted radiator paired with a pusher or puller cooling fan.

General Technical Data

Engine Specifications

Engine Model ............... Shibaura LEK802D
Engine Type ............... 4-cycle inline 2-cylinder indirect injection liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... Vertical in-line orientation
Cylinder Bore, in (mm) ............... 3.15 (80.0)
Piston Stroke, in (mm) ............... 3.15 (80.0)
Total Displacement, cu.in (L) ............... 49.1 (0.804)
Gross Power, hp (kW) ............... 16.0 (11.9)
Net Power, hp (kW) ............... 15.3 (11.4)
Rated Speed, rpm ............... 2700
Peak Torque, lb-ft (Nm) ............... 32.9 (44.6)
Torque Speed, rpm ............... 1800
Low Idle Speed, rpm ............... 750-850
High Idle Speed, rpm ............... 2750-2800
Compression Ratio ............... 23.1:1
Firing Order ............... 1-2
Cylinder Block Material ............... Heavy-duty cast iron
Cylinder Head Material ............... High-tensile cast iron
Combustion Chamber ............... Indirect injection swirl chamber
Lubrication System ............... Full-pressure feed lubrication loop
Oil Pump Type ............... Trochoid gear-driven mechanical pump
Oil Filter Type ............... Full-flow disposable spin-on cartridge
Cooling System ............... Pressurized forced liquid circulation
Coolant Pump Type ............... V-belt driven centrifugal flow pump
Thermostat Valve Control ............... Wax-pellet temperature control type
Air Cleaner Type ............... Dry dual-stage heavy-duty element
Cold Weather Starting Aid ............... High-capacity electric glow plugs
Starting System ............... Heavy-duty 12V electric starter motor
Electrical System, V ............... 12
Alternator Capacity, A ............... 15

Fuel System

Fuel Injection System ............... Indirect injection mechanical design
Fuel Injection Pump ............... Shibaura / Bosch type ND design
Fuel Injection Pump Type ............... In-line multi-plunger mechanical pump
Fuel Injection Nozzle Holder Type ............... Throttle type single hole nozzle
Fuel Injector Opening Pressure, psi (MPa) ............... 1707-1849 (11.8-12.7)
Injection Timing Advance Angle, deg BTDC ............... 20
Fuel Feed Supply Pump Design ............... Mechanical diaphragm transfer pump
Fuel Feed Pump Delivery Pressure, psi (kPa) ............... 2.9-4.3 (20.0-30.0)
Fuel Filtration System ............... Spin-on cartridge filter with water separator
Fuel Supply Inlet Temperature, F (C) ............... 122 (50)
Governor Type ............... Mechanical centrifugal flyweight governor
Fuel Injection Plunger Outside Diameter, in (mm) ............... 0.216 (5.5)
Fuel Injection Plunger Stroke Length, in (mm) ............... 0.275 (7.0)
Fuel Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Fuel Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Leak Off Return Tube Diameter, in (mm) ............... 0.157 (4.0)

Dimensions and Weight

Overall Length, in (mm) ............... 18.5 (470)
Overall Width, in (mm) ............... 16.1 (410)
Overall Height, in (mm) ............... 21.3 (540)
Dry Weight, lbs (kg) ............... 165 (75)
Operating Weight, lbs (kg) ............... 183 (83)

Maintenance Data

Service Information

Oil Pressure at Low Idle Speed, psi (kPa) ............... 49.0 (337.8)
Oil Pressure at Rated Speed, psi (kPa) ............... 56.0 (386.1)
Oil Pressure Relief Valve Setting, psi (kPa) ............... 64.0 (441.3)
Maximum Oil Temperature, F (C) ............... 248 (120)
Intake Valve Clearance, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance, in (mm) ............... 0.012 (0.30)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 5W-20
API Service Classifications ......................... CD or CE
Engine Oil Capacity, qts (L) ............... 3.5 (3.3)
Engine Oil Capacity (Minimum), qts (L) ............... 2.3 (2.2)
Cooling System Capacity, qts (L) ............... 4.2 (4.0)

Service Intervals

Change oil and filter ............... Every 100 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 500 hours
Replace fuel filter ............... Every 200 hours
Valve clearance adjustment ............... Every 300 hours
Fuel system inspection ............... Every 600 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 800 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Liner Bore Inner Diameter, in (mm) ............... 3.1496-3.1504 (80.000-80.020)
Cylinder Liner Out of Roundness, in (mm) ............... 0.0008 (0.020)
Cylinder Block Deck Surface Flatness, in (mm) ............... 0.0020 (0.050)
Main Bearing Bore Inner Diameter, in (mm) ............... 2.2047-2.2055 (56.000-56.020)
Main Journal Outer Diameter, in (mm) ............... 2.0465-2.0472 (51.980-52.000)
Main Bearing Shell Clearance, in (mm) ............... 0.0014-0.0031 (0.035-0.080)
Crankpin Outer Diameter, in (mm) ............... 1.7709-1.7717 (44.980-45.000)
Crankpin Bearing Shell Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Crankshaft End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Crankshaft Journal Out of Round Max, in (mm) ............... 0.0004 (0.010)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9453-0.9461 (24.010-24.030)
Connecting Rod Big End Inner Diameter, in (mm) ............... 1.8898-1.8906 (48.000-48.020)
Connecting Rod Center to Center Length, in (mm) ............... 4.9213 (125.00)
Piston Skirt Outer Diameter, in (mm) ............... 3.1465-3.1472 (79.920-79.940)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Piston Pin Outer Diameter, in (mm) ............... 0.9446-0.9449 (23.993-24.000)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9449-0.9452 (24.000-24.006)
Piston Pin to Piston Boss Clearance, in (mm) ............... 0.0000-0.0005 (0.000-0.013)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0004-0.0015 (0.010-0.037)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1575-0.1583 (4.000-4.020)
Top Ring Side Clearance, in (mm) ............... 0.0024-0.0037 (0.060-0.095)
Second Ring Side Clearance, in (mm) ............... 0.0020-0.0033 (0.050-0.085)
Oil Ring 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) ............... 0.0059-0.0118 (0.150-0.300)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Cylinder Head Fire Deck Distortion Warp, in (mm) ............... 0.0020 (0.050)
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 Guide Inner Diameter, in (mm) ............... 0.2756-0.2762 (7.000-7.015)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.2756-0.2762 (7.000-7.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0014-0.0026 (0.035-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0024-0.0037 (0.060-0.095)
Intake Valve Face Angle, deg ............... 45
Exhaust Valve Face Angle, deg ............... 45
Intake Valve Head Thickness, in (mm) ............... 0.0394 (1.000)
Exhaust Valve Head Thickness, in (mm) ............... 0.0394 (1.000)
Valve Spring Free Length, in (mm) ............... 1.4961 (38.00)
Camshaft Journal Outside Diameter (Front), in (mm) ............... 1.6913-1.6921 (42.960-42.980)
Camshaft Journal Outside Diameter (Center), in (mm) ............... 1.6519-1.6528 (41.960-41.980)
Camshaft Journal Outside Diameter (Rear), in (mm) ............... 1.6126-1.6134 (40.960-40.980)
Camshaft Bearing Clearance, in (mm) ............... 0.0008-0.0031 (0.020-0.080)
Camshaft End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Cam Lobe Height (Intake), in (mm) ............... 1.3366-1.3386 (33.950-34.000)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3366-1.3386 (33.950-34.000)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4717-0.4724 (11.980-12.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4732-0.4740 (12.020-12.040)
Rocker Arm to Shaft Radial Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Tappet Lifter Barrel Outer Diameter, in (mm) ............... 0.8646-0.8654 (21.960-21.980)
Tappet Guide Bore Inner Diameter, in (mm) ............... 0.8661-0.8671 (22.000-22.025)
Tappet to Guide Bore Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.065)
Idler Gear Shaft Outer Diameter, in (mm) ............... 1.3370-1.3378 (33.960-33.980)
Idler Gear Bushing Inner Diameter, in (mm) ............... 1.3386-1.3396 (34.000-34.025)
Idler Gear Shaft to Bushing Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.065)

Tightening Torques

Cylinder Head Bolts, lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Connecting Rod Cap Nut, lb-ft (Nm) ............... 21.7-25.3 (29.4-34.3)
Flywheel to Crankshaft Assembly Mounting Bolts, lb-ft (Nm) ............... 43.4-47.0 (58.8-63.7)
Crankshaft Front Drive Belt Pulley Central Nut , lb-ft (Nm) ............... 72.3-79.6 (98.0-107.9)
Camshaft Thrust Plate Retaining Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Camshaft Drive Gear Retention Nut, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Idler Gear Shaft Support Retaining Bolt, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Rocker Arm Support Shaft Stanchion Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Valve Rocker Arm Adjustment Screw Locknut, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Cylinder Valve Rocker Cover Retaining Nut, lb-ft (Nm) ............... 5.1-7.2 (6.9-9.8)
Oil Pump Assembly Retaining Mounting Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Oil Pan Sump Retaining Flange Bol, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Oil Pan Sump Bottom Fluid Drain Plug, lb-ft (Nm) ............... 21.7-28.9 (29.4-39.2)
Fuel Injection Pump Mounting Flange Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Fuel Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 28.9-36.2 (39.2-49.0)
Fuel Injector Assembly Outer Nozzle Holder, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Injector Leak Off Fluid Return Pipe Nut, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
High Pressure Fuel Line Compression Union Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Glow Plug Assembly Internal Thread, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Water Pump Assembly Mounting Housing Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Cooling Thermostat Housing Retaining Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Intake Manifold Attaching Flange Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Exhaust Manifold Attaching Flange Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Starter Motor Chassis Mounting Attachment Bolt, lb-ft (Nm) ............... 28.9-36.2 (39.2-49.0)
Alternator Mounting Bracket Pivot Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)

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• Shibaura Engines Specs
  
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• Shibaura LEM853 Specs
  

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