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Shibaura LEK752C Engine

General Technical Data

Engine Specifications

Engine Model ............... Shibaura LEK752C
Engine Type ............... 4-cycle inline 2-cylinder naturally aspirated liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 2.95 (75.0)
Engine Stroke, in (mm) ............... 3.15 (80.0)
Displacement, cu.in (L) ............... 43.1 (0.706)
Rated Engine Power, hp (kW) ............... 13.0 (9.7)
Rated Engine Speed, rpm ............... 2600-2700
Peak Torque, lb-ft (Nm) ............... 26.72 (36.2) at 2000 rpm
Idle Speed, rpm ............... 800-900
Aspiration Type ............... Naturally Aspirated
Operating Speed, rpm ............... 2600
Compression Ratio ............... 23.0:1
Firing Order ............... 1-2
Combustion Chamber Design ............... Swirl chamber spherical type
Flywheel Rotation Direction ............... Counterclockwise viewed from flywheel side
Valves per Cylinder ............... 2
Valve Arrangement ............... Overhead valve mechanism
Camshaft Drive Type ............... Gear driven train
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure feed
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled forced circulation
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage element
Starting System ............... Electric Starter motor
Electrical System, V ............... 12
Alternator Output, A ............... 40

Fuel System

Fuel Injection Pump Type ............... Niki-style inline injection block
Injection Pump Drive ............... Camshaft gear direct engagement
Fuel Feed Pump Type ............... Mechanical diaphragm design
Governor Type ............... Mechanical centrifugal all-speed type
Fuel Filter Type ............... Spin-on cartridge with internal water sedimenter separator
Injection Nozzle Type ............... Throttle orifice design pintle configuration
Injection Starting Pressure, psi (MPa) ............... 1991-2132 (13.7-14.7)
Fuel Injection Timing, deg BTDC ............... 21-23
Timing Adjustment Method ............... Adjustable shims under injection pump body assembly
Fuel Transfer Pump Pressure, psi (kPa) ............... 2.9-4.3 (20-30)
Fuel Tank Minimum Line Diameter, in (mm) ............... 0.25 (6.35)
Fuel Return Line Inner Diameter, in (mm) ............... 0.19 (4.8)
Maximum Fuel Pump Inlet Suction, in Hg (kPa) ............... 3.94 (13.3)
Fuel Filter Rating, microns ............... 10.0
Injection Line Length, in (mm) ............... 11.81 (300.0)
Injection Line Outside Diameter, in (mm) ............... 0.236 (6.0)
Injection Line Inside Diameter, in (mm) ............... 0.078 (2.0)
Governor Speed Regulation Range, % ............... 8.0-12.0
Fuel Specific Consumption, lb/hp-hr (g/kW-hr) ............... 0.411 (250.0)

Dimensions and Weight

Engine Length, in (mm) ............... 18.9 (480)
Engine Width, in (mm) ............... 19.3 (490)
Engine Height, in (mm) ............... 22.4 (570)
Dry Weight, lbs (kg) ............... 143 (65)
Wet Weight, lbs (kg) ............... 154 (70)

Maintenance Data

Service Information

Compression Pressure, Minimum at 200 rpm, psi (MPa) ............... 427.0 (2.94)
Compression Pressure, Service Limit, psi (MPa) ............... 356.0 (2.45)
Compression Difference Between Cylinders, psi (MPa) ............... 35.6 (0.245)
Oil Pressure at Low Idle, psi (kPa) ............... 14.2 (98.1)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.7-56.9 (294.0-392.0)
Thermostat Opening Temperature, F (C) ............... 160.0 (71.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Cooling System Cap Pressure, psi (kPa) ............... 12.8 (88.3)
Fan Belt Tension Deflection under 22 lb Force, in (mm) ............... 0.39-0.59 (10.0-15.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0079 (0.20)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0079 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CD, CE, or CF-4
Engine Oil Capacity with Filter, qts (L) ............... 3.5 (3.3)
Engine Oil Capacity without Filter, qts (L) ............... 3.17 (3.0)
Cooling System Capacity, qts (L) ............... 3.4 (3.2)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 200 hours
Replace fuel filter ............... Every 200 hours
Service air filter ............... Every 50 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 400 hours
Compression test ............... Every 1000 hours
Clean radiator fin ............... Every 100 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 2.9527-2.9535 (75.000-75.020)
Cylinder Bore Wear Limit, in (mm) ............... 2.9606 (75.200)
Cylinder Bore Out-of-Round Limit, in (mm) ............... 0.0008 (0.020)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0020 (0.050)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.8272-0.8280 (21.010-21.030)
Connecting Rod Big End I.D, in (mm) ............... 1.8504-1.8512 (47.000-47.020)
Connecting Rod Side Clearance, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Crankshaft Main Journal Diameter, in (mm) ............... 1.9685-1.9693 (50.000-50.020)
Crankshaft Main Journal Clearance, in (mm) ............... 0.0014-0.0033 (0.035-0.085)
Crankpin Journal Diameter, in (mm) ............... 1.7323-1.7331 (44.000-44.020)
Crankpin Journal Oil Clearance, in (mm) ............... 0.0014-0.0031 (0.035-0.080)
Crankshaft Axial End Play, in (mm) ............... 0.0020-0.0079 (0.050-0.200)
Piston Skirt Outer Diameter, in (mm) ............... 2.9492-2.9500 (74.910-74.930)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.8268-0.8272 (21.000-21.010)
Piston Pin Outside Diameter, in (mm) ............... 0.8264-0.8268 (20.990-21.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0008 (0.000-0.020)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0039 (0.100)
Top Ring Groove Width, in (mm) ............... 0.0984-0.0992 (2.500-2.520)
Second Ring Groove Width, in (mm) ............... 0.0984-0.0992 (2.500-2.520)
Oil Ring Groove Width, in (mm) ............... 0.1575-0.1583 (4.000-4.020)
Top Ring Thickness, in (mm) ............... 0.0965-0.0972 (2.450-2.470)
Second Ring Thickness, in (mm) ............... 0.0965-0.0972 (2.450-2.470)
Oil Ring Thickness, in (mm) ............... 0.1563-0.1571 (3.970-3.990)
Top Ring Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Second Ring Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Oil Ring Side Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Second Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Oil Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Cylinder Head Bottom Surface Distortion Flatness, in (mm) ............... 0.0020 (0.050)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2732-0.2738 (6.940-6.955)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.2756-0.2764 (7.000-7.020)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.2756-0.2764 (7.000-7.020)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0014-0.0028 (0.035-0.070)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0018-0.0031 (0.045-0.080)
Valve Face Angle, deg ............... 45
Valve Seat Angle, deg ............... 45
Intake Valve Seat Width, in (mm) ............... 0.0591-0.0709 (1.500-1.800)
Exhaust Valve Seat Width, in (mm) ............... 0.0591-0.0709 (1.500-1.800)
Valve Recessing Depth, in (mm) ............... 0.0276-0.0354 (0.700-0.900)
Valve Spring Free Length, in (mm) ............... 1.4961 (38.000)
Camshaft Journal Diameter, in (mm) ............... 1.4961-1.4969 (38.000-38.020)
Camshaft Journal Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Intake Cam Lobe Height, in (mm) ............... 1.3386-1.3394 (34.000-34.020)
Exhaust Cam Lobe Height, in (mm) ............... 1.3386-1.3394 (34.000-34.020)
Tappet Valve Lifter Outside Diameter, in (mm) ............... 0.4717-0.4724 (11.980-12.000)
Tappet Guide Hole Inner Diameter, in (mm) ............... 0.4728-0.4736 (12.010-12.030)
Tappet to Guide Hole Clearance Standard, in (mm) ............... 0.0004-0.0020 (0.010-0.050)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4732 (12.000-12.020)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.4713-0.4720 (11.970-11.990)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0004-0.0020 (0.010-0.050)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.3374-1.3382 (33.970-33.990)
Idler Gear Bushing Inner Diameter, in (mm) ............... 1.3386-1.3398 (34.000-34.030)
Idler Gear to Shaft Clearance, in (mm) ............... 0.0004-0.0024 (0.010-0.060)

Tightening Torques

Cylinder Head Bolts, lb-ft (Nm) ............... 50.6-54.2 (68.6-73.5)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 23.1-26.0 (31.4-35.3)
Flywheel Mounting Bolts, lb-ft (Nm) ............... 43.4-47.0 (58.8-63.7)
Crankshaft Main Bearing Cap Bolts, lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Crankshaft Pulley Center Bolt, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Rocker Arm Shaft Bracket Bolts, lb-ft (Nm) ............... 20.3-24.6 (27.5-33.3)
Flywheel Housing Attachment Bolts, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Timing Gear Case Assembly Bolts, lb-ft (Nm) ............... 13.0-17.4 (17.7-23.5)
Oil Pan Drain Plug, lb-ft (Nm) ............... 25.3-32.5 (34.3-44.1)
Oil Pan Peripheral Bolts, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Injection Nozzle Holder Assembly, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Injection Nozzle Cap Nut, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Fuel Injection Delivery Valve Holder, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Fuel Injection Pump Fixing Nut, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
High Pressure Fuel Line Flare Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Glow Plug, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Oil Pressure Switch, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Water Temperature Sender, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Intake Manifold Assembly Mounting Bolts, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Exhaust Manifold Assembly Mounting Nuts, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Alternator Pivot Mount Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Alternator Adjusting Strap Tension Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Starter Motor Fixed Chassis Flange Bolts, lb-ft (Nm) ............... 36.2-43.4 (49.0-58.8)
Valve Rocker Arm Cover Center Acorn Nut, lb-ft (Nm) ............... 5.1-8.7 (6.9-11.8)

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