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Shibaura LET852C Engine

General Technical Data

Engine Specifications

Engine Model ............... Shibaura LET852C
Engine Type ............... 4-cycle inline 2-cylinder indirect injection liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.35 (85.0)
Engine Stroke, in (mm) ............... 3.94 (100.0)
Displacement, cu.in (L) ............... 69.2 (1.134)
Rated Engine Power, hp (kW) ............... 13-20 (9.7-14.9)
Rated Engine Speed, rpm ............... 2500-2700
Peak Torque ............... 36.2-52.0 Nm (26.7-38.3 lb-ft) at 2000 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2500 rpm
Compression Ratio ............... 21.0:1-23.0:1
Firing Order ............... 1-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage or oil bath
Starting System ............... Electric Starter
Electrical System ............... 12V

Fuel System

Injection Pump Type ............... In-line Bosch Type Bosch K-Mini
Governor Type ............... Mechanical centrifugal
Injection Timing ............... 18-22 degrees BTDC
Injection Pressure, psi (bar) ............... 1700-1850 (117-128)
Fuel Filter Type ............... Spin-on element with water separator
Fuel Transfer Pump ............... Mechanical diaphragm type
Fuel Feed Pressure, psi (bar) ............... 2.9-4.3 (0.2-0.3)
Maximum Fuel Return Restriction, inHg (kPa) ............... 6.0 (20.3)
Fuel Injector Type ............... Throttle type nozzle
Glow Plug Voltage ............... 12V
Glow Plug Current Draw, A ............... 10-12 per plug
Maximum Fuel Consumption, lb/hp-hr (g/kW-hr) ............... 0.42 (255)
Recommended Fuel Grade ............... Ultra-low sulfur diesel No. 2-D
Fuel Transfer Rate, gph (L/hr) ............... 4.5 (17.0)
Fuel Leak-off System ............... Low-pressure return line to tank

Dimensions and Weight

Overall Length, in (mm) ............... 18.9 (480)
Overall Width, in (mm) ............... 16.5 (420)
Overall Height, in (mm) ............... 21.7 (550)
Dry Weight, lb (kg) ............... 201 (91)

Maintenance Data

Service Information

Oil Pressure at Idle Speed, psi (bar) ............... 14.5 (1.0)
Oil Pressure at Rated Speed, psi (bar) ............... 58.0 (4.0)
Oil Temperature Operating Range, F (C) ............... 176-230 (80-110)
Thermostat Opening 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 (10-12)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CD, CF, or higher
Engine Oil Capacity with Filter, qt (L) ............... 4.2 (4.0)
Engine Oil Capacity without Filter, qt (L) ............... 3.7 (3.5)
Cooling System Fluid Capacity, qt (L) ............... 4.8 (4.5)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 100 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 Inside Diameter, in (mm) ............... 3.3465-3.3472 (85.000-85.019)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.3543 (85.200)
Cylinder Out-of-Roundness Max, in (mm) ............... 0.0008 (0.020)
Cylinder Taper Max Allowable, in (mm) ............... 0.0012 (0.030)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1031-1.1039 (28.020-28.040)
Crankpin Main Journal Diameter, in (mm) ............... 2.2437-2.2445 (56.991-57.011)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0031 (0.035-0.080)
Crankshaft Main Journal Diameter, in (mm) ............... 2.6768-2.6776 (67.991-68.011)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0016-0.0035 (0.040-0.090)
Crankshaft Axial End Play, in (mm) ............... 0.0020-0.0079 (0.050-0.200)
Piston Skirt Outer Diameter, in (mm) ............... 3.3433-3.3441 (84.920-84.940)
Piston-to-Cylinder Bore Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.099)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1024-1.1028 (28.000-28.010)
Piston Pin Outer Diameter, in (mm) ............... 1.1020-1.1023 (27.992-28.000)
Piston Pin-to-Piston Pin Bore Clearance, in (mm) ............... 0.0031 (0.080)
Top Ring Groove Width, in (mm) ............... 0.0996-0.1004 (2.530-2.550)
Second Ring Groove Width, in (mm) ............... 0.0795-0.0803 (2.020-2.040)
Oil Ring Groove Width, in (mm) ............... 0.1583-0.1591 (4.020-4.040)
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 Flatness Distortion, in (mm) ............... 0.0020 (0.050)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0020 (0.050)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3130-0.3138 (7.950-7.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3118-0.3126 (7.920-7.940)
Valve Guide Inner Diameter, in (mm) ............... 0.3150-0.3157 (8.000-8.018)
Intake Valve Stem-to-Guide Clearance, in (mm) ............... 0.0012-0.0027 (0.030-0.068)
Exhaust Valve Stem-to-Guide Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.098)
Intake Valve Sink Depth, in (mm) ............... 0.0276-0.0374 (0.700-0.950)
Exhaust Valve Sink Depth, in (mm) ............... 0.0276-0.0374 (0.700-0.950)
Valve Spring Free Length, in (mm) ............... 1.6535 (42.000)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.5492-0.5500 (13.950-13.970)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.5512-0.5524 (14.000-14.030)
Camshaft Journal Diameter, in (mm) ............... 1.6516-1.6524 (41.950-41.970)
Cam Lobe Height (Intake), in (mm) ............... 1.3425-1.3445 (34.100-34.150)
Cam Lobe Height (Exhaust), in (mm) ............... 1.3425-1.3445 (34.100-34.150)
Camshaft Axial End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)

Tightening Torques

Cylinder Head Bolt (Stage 1), lb-ft (Nm) ............... 28.9 (39.2)
Cylinder Head Bolt (Stage 2), lb-ft (Nm) ............... 57.8 (78.4)
Cylinder Head Bolt (Stage 3), lb-ft (Nm) ............... 72.3-79.5 (98.0-107.8)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Connecting Rod Cap Nut, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Flywheel Mounting Bolt, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Crankshaft Pulley Center Bolt, lb-ft (Nm) ............... 108.4-122.9 (147.0-166.6)
Rocker Arm Shaft Bracket Bolt, lb-ft (Nm) ............... 21.7-28.9 (29.4-39.2)
Valve Cover Retaining Nut, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Intake Manifold Mounting Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Exhaust Manifold Mounting Nut, lb-ft (Nm) ............... 18.1-25.3 (24.5-34.3)
Oil Pan Drain Plug, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Oil Pan Securing Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Injection Pump Delivery Valve Holder, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Fuel Injector Retaining Nut, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Leak-off Pipe Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Fuel Injection High Pressure Pipe Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Glow Plug Torque, 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 Pump Mounting Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Thermostat Housing Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 36.1-50.6 (49.0-68.6)
Alternator Mounting Pivot Bolt, lb-ft (Nm) ............... 21.7-28.9 (29.4-39.2)
Alternator Adjusting Link Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Timing Gear Case Cover Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Idler Gear Shaft Securing Bolt, lb-ft (Nm) ............... 21.7-28.9 (29.4-39.2)
Camshaft Thrust Plate Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Hydraulic Pump Drive Gear Nut, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Flywheel Housing Mounting Bolt, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Oil Strainer Pick-up Tube Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Oil Pump Cover Plate Screw, lb-ft (Nm) ............... 5.1-7.2 (6.9-9.8)
Fuel Transfer Pump Mounting Nut, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)

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