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Komatsu 4D94LE Engine

General Technical Data

Engine Specifications

Engine Model ............... Komatsu 4D94LE
Engine Type ............... 4-cycle inline 4-cylinder water-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line vertical
Engine Bore, in (mm) ............... 3.701 (94.0)
Engine Stroke, in (mm) ............... 4.331 (110.0)
Displacement, cu.in (L) ............... 186.3 (3.053)
Combustion Chamber Type ............... Swirl chamber type
Rated Engine Power, hp (kW) ............... 59.1 (44.1)
Rated Engine Speed, rpm ............... 2450
Peak Torque, lb-ft (Nm) ............... 131.6 (178.5) at 1500 rpm
Idle Speed, rpm ............... 750-850
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 22.0:1
Firing Order ............... 1-3-4-2
Power Take Off ............... Flywheel side
Direction of Rotation ............... Counterclockwise viewed from flywheel
Cylinder Block Material ............... Cast iron
Cylinder Head Material ............... Cast iron
Lubrication System Type ............... Forced lubrication with trochoid pump
Oil Pump Type ............... Inner and outer trochoid rotor type
Oil Filter Type ............... Full-flow cartridge spin-on
Cooling System ............... Radiator liquid-cooled with centrifugal pump
Water Pump Type ............... Belt-driven centrifugal type
Thermostat Type ............... Wax pellet type with bypass bypass
Air Cleaner Type ............... Dry heavy duty dual stage type
Starting System ............... Electric starter motor
Electrical System ............... 12V or 24V options
Alternator Capacity ............... 40 or 60A

Fuel System

Fuel Injection Pump Type ............... Bosch VE type distributor pump
Governor Type ............... All-speed mechanical governor
Fuel Feed Pump Type ............... Vane type integrated pump
Fuel Injection Timing, deg ............... 12-14 Before Top Dead Center
Fuel Injection Nozzle Type ............... Throttle type nozzle
Nozzle Injection Opening Pressure, psi (MPa) ............... 1784-1929 (12.3-13.3)
Fuel Filter Type ............... Full-flow spin-on cartridge
Applicable Fuel Grade ............... ISO 8217 DMA or BS 2869 A1
Minimum Fuel Cetane Number ............... 45
Fuel Return Line System ............... Overflow pipe to fuel tank
Injection Pump Plunger Diameter, in (mm) ............... 0.472 (12.0)
Plunger Lift Distance, in (mm) ............... 0.039 (1.0)
Delivery Valve Opening Pressure, psi (MPa) ............... 290-348 (2.0-2.4)
Fuel Transfer Pump Delivery Pressure, psi (MPa) ............... 29-43 (0.2-0.3)
Maximum Fuel System Pressure, psi (MPa) ............... 4351 (30.0)

Dimensions and Weight

Overall Length, in (mm) ............... 27.6 (700)
Overall Width, in (mm) ............... 20.0 (510)
Overall Height, in (mm) ............... 27.8 (710)
Dry Weight, lbs (kg) ............... 496 (225)

Maintenance Data

Service Information

Standard Compression Pressure, psi (MPa) ............... 411.9-440.9 (2.84-3.04)
Minimum Compression Pressure, psi (MPa) ............... 340.8 (2.35)
Compression Variance Between Cylinders, psi (MPa) ............... 29.0 (0.2)
Oil Pressure at Idle, psi (MPa) ............... 9.9-14.2 (0.07-0.10)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.1-56.6 (0.29-0.39)
Thermostat Valve Opening Temperature, F (C) ............... 159.8-185.0 (71.0-85.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Drive V-Belt Deflection, in (mm) ............... 0.393-0.551 (10.0-14.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.006-0.010 (0.15-0.25)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.006-0.010 (0.15-0.25)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CF-4 or CH-4
Total Lubrication Oil Capacity, qt (L) ............... 7.9 (7.5)
Oil Pan Effective Capacity, qt (L) ............... 5.8 (5.5)
Cooling Water Capacity Engine Only, qt (L) ............... 4.4 (4.2)

Service Intervals

Change engine oil ............... Every 250 hours
Replace oil filter ............... Every 250 hours
Replace fuel filter ............... Every 500 hours
Service air filter ............... Every 250 hours
Replace air filter ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 1000 hours
Check fuel system ............... Every 1000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.700-3.701 (94.00-94.03)
Cylinder Bore Roundness Maximum, in (mm) ............... 0.0003 (0.01)
Cylinder Bore Taper Maximum, in (mm) ............... 0.0003 (0.01)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0019 (0.05)
Cylinder Liner Outer Diameter, in (mm) ............... 3.779-3.780 (96.00-96.03)
Main Journal Outer Diameter, in (mm) ............... 2.554-2.555 (64.89-64.91)
Main Journal Out of Roundness, in (mm) ............... 0.0003 (0.01)
Main Bearing Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.04-0.09)
Crankpin Outer Diameter, in (mm) ............... 2.121-2.122 (53.89-53.91)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.04-0.09)
Crankshaft End Play, in (mm) ............... 0.0051-0.0090 (0.13-0.23)
Thrust Bearing Thickness, in (mm) ............... 0.078-0.080 (2.00-2.04)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1818-1.1824 (30.018-30.034)
Connecting Rod Small End to Bushing Clearance, in (mm) ............... 0.0007-0.0017 (0.018-0.045)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0078-0.0157 (0.20-0.40)
Piston Skirt Outer Diameter, in (mm) ............... 3.696-3.697 (93.89-93.92)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0031-0.0051 (0.08-0.13)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1811-1.1814 (30.001-30.009)
Piston Pin Outer Diameter, in (mm) ............... 1.1807-1.1811 (29.989-30.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.001-0.020)
Top Ring Groove Width, in (mm) ............... 0.081-0.082 (2.06-2.08)
Second Ring Groove Width, in (mm) ............... 0.079-0.080 (2.02-2.04)
Oil Ring Groove Width, in (mm) ............... 0.158-0.159 (4.01-4.03)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.07-0.11)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0031 (0.04-0.08)
Oil Ring Side Clearance, in (mm) ............... 0.0007-0.0023 (0.02-0.06)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.25-0.40)
Second Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.25-0.40)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0177 (0.25-0.45)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.05)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.313-0.314 (7.96-7.98)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.312-0.313 (7.94-7.96)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0023 (0.03-0.06)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0019-0.0031 (0.05-0.08)
Valve Guide Inner Diameter, in (mm) ............... 0.3150-0.3155 (8.000-8.015)
Intake Valve Recess Depth, in (mm) ............... 0.011-0.019 (0.3-0.5)
Exhaust Valve Recess Depth, in (mm) ............... 0.011-0.019 (0.3-0.5)
Valve Seat Angle, deg ............... 90 or 120 total angle
Valve Seat Contact Width, in (mm) ............... 0.043-0.055 (1.1-1.4)
Valve Spring Free Length, in (mm) ............... 1.653 (42.0)
Camshaft Journal Outer Diameter, in (mm) ............... 1.768-1.769 (44.92-44.95)
Camshaft Bushing Inner Diameter, in (mm) ............... 1.771-1.773 (45.00-45.04)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0019-0.0047 (0.05-0.12)
Intake Cam Height, in (mm) ............... 1.517-1.521 (38.53-38.63)
Exhaust Cam Height, in (mm) ............... 1.517-1.521 (38.53-38.63)
Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.05-0.15)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.726-0.727 (18.46-18.48)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.728-0.729 (18.50-18.52)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0007-0.0023 (0.02-0.06)
Tappet Stem Outer Diameter, in (mm) ............... 0.470-0.471 (11.96-11.98)
Tappet Guide Hole Inner Diameter, in (mm) ............... 0.472-0.473 (12.00-12.02)
Tappet Stem to Guide Hole Clearance, in (mm) ............... 0.0007-0.0023 (0.02-0.06)
Crankshaft Gear to Camshaft Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.07-0.14)
Crankshaft Gear to Idle Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.07-0.14)
Idle Gear to Camshaft Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.07-0.14)
Idle Gear to Injection Pump Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.07-0.14)
Crankshaft Gear to Oil Pump Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.07-0.14)

Tightening Torques

Cylinder Head Bolt (1-Stage), lb-ft (Nm) ............... 36.1-43.5 (49.0-59.0)
Cylinder Head Bolt (2-Stage), lb-ft (Nm) ............... 75.9-83.3 (103.0-113.0)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 79.6-87.0 (108.0-118.0)
Connecting Rod Cap Nut, lb-ft (Nm) ............... 39.8-43.5 (54.0-59.0)
Flywheel Bolt, lb-ft (Nm) ............... 61.4-68.6 (83.3-93.0)
Crankshaft Pulley Bolt, lb-ft (Nm) ............... 86.7 (117.6)
Camshaft Thrust Metal Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Rocker Shaft Support Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Flywheel Housing Bolt, lb-ft (Nm) ............... 32.5-39.8 (44.1-53.9)
Timing Gear Case Cover Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Oil Pan Mounting Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Oil Pan Drain Plug, lb-ft (Nm) ............... 36.1-43.5 (49.0-59.0)
Fuel Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Injection Nozzle Mounting Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Fuel High Pressure Pipe Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Fuel Injection Pump Bracket Mounting Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Fuel Delivery Valve Holder, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Fuel Injection Nozzle Case Nut, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Fuel Return Pipe Fixing Nut, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Intake Manifold Fixing Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Exhaust Manifold Fixing Nut, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Water Pump Mounting Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Thermostat Housing Fixing Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 32.5-39.8 (44.1-53.9)
Alternator Adjusting Brace Locking Bolt, lb-ft (Nm) ............... 16.6-20.9 (22.5-28.4)
Alternator Mounting Pivot Bolt, lb-ft (Nm) ............... 32.5-39.8 (44.1-53.9)
Oil Pressure Switch Installation, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Glow Plug Installation, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Coolant Temperature Sensor, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)

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• Komatsu Engines Specs
  
• Komatsu 4D92E Specs
  
• Komatsu 4D95S Specs
  
• Komatsu 4D95L Specs
  
• Komatsu 4D95LE Specs
  

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