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Komatsu 4D95LE Engine

General Technical Data

Engine Specifications

Engine Model ............... Komatsu 4D95LE
Engine Type ............... 4-cycle inline 4-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.74 (95.0)
Engine Stroke, in (mm) ............... 4.53 (115.0)
Displacement, cu.in (L) ............... 199 (3.26)
Rated Engine Power, hp (kW) ............... 60-99 (44.7-74.0)
Rated Engine Speed, rpm ............... 1950-2350
Peak Torque ............... 200-320 Nm (147-236 lb-ft) at 1600 rpm
High Idle Speed, rpm ............... 2150-2550
Low Idle Speed, rpm ............... 700-900
Aspiration Type ............... Naturally Aspirated or Turbocharged
Operating Speed, rpm ............... 2200
Compression Ratio ............... 17.0:1-18.5:1
Firing Order ............... 1-2-4-3
Combustion Chamber Type ............... Direct injection bowl-in-piston
Crankshaft Rotation Direction ............... Clockwise from front end
Valve Mechanism ............... Overhead valve, gear-driven camshaft
Number of Valves per Cylinder ............... 2
Intake Valve Number ............... 1 per cylinder
Exhaust Valve Number ............... 1 per cylinder
Cylinder Block Type ............... Cast iron monoblock
Cylinder Head Type ............... Single-piece cast iron
Lubrication System ............... Full-pressure forced lubrication
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 ............... 24V
Alternator Capacity ............... 24V, 35A
Starter Motor Capacity ............... 24V, 4.5 kW

Fuel System

Fuel Injection Pump Type ............... Bosch P-type or Common Rail
Fuel Feed Pump Type ............... Mechanical plunger type
Governor Type ............... Mechanical all-speed or electronic control
Fuel Injection Method ............... Mechanical inline pump or common rail electronic injection
Fuel Injection Timing ............... 12-16 degrees before top dead center
Fuel Injector Type ............... Multi-hole nozzle type
Number of Injection Nozzle Holes ............... 4-5 holes
Nozzle Hole Diameter, in (mm) ............... 0.010 (0.25)
Fuel Injection Pressure, psi (MPa) ............... 2844-3128 (19.6-21.6)
Second Stage Injection Pressure, psi (MPa) ............... 3410-3690 (23.5-25.4)
Fuel Filter Type ............... Spin-on high efficiency cartridge
Fuel Transfer Pump Pressure, psi (kPa) ............... 29-43 (200-300)
Fuel Return Line Maximum Restrictor Pressure, psi (kPa) ............... 7.1 (49.0)
Common Rail Maximum System Pressure, psi (MPa) ............... 23200 (160.0)
Fuel Leak-off Flow Rate Limit, qt/hr (L/hr) ............... 10.5 (10.0)
Injection Nozzle Needle Valve Seat Clearance, in (mm) ............... 0.0008 (0.02)
Injection Nozzle Needle Lift, in (mm) ............... 0.0098 (0.25)
Fuel Injection Line Outer Diameter, in (mm) ............... 0.25 (6.35)
Fuel Injection Line Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Tank Vent Valve Opening Pressure, psi (kPa) ............... 0.72 (5.0)
Fuel Filter Water Separator Capacity, oz (mL) ............... 6.7 (200)
Fuel Pre-Filter Mesh Rating, microns ............... 10-15
Main Fuel Filter Mesh Rating, microns ............... 2-4
Maximum Fuel Inlet Restriction, in-Hg (kPa) ............... 4.0 (13.5)
Maximum Fuel Return Restriction, in-Hg (kPa) ............... 10.0 (33.8)
Maximum Permissible Fuel Temperature, F (C) ............... 158 (70)
Fuel Injection Pump Oil Level ............... Integrated with engine oil circuit

Dimensions and Weight

Overall Length, in (mm) ............... 28.5 (725)
Overall Width, in (mm) ............... 22.4 (570)
Overall Height, in (mm) ............... 31.1 (790)
Dry Weight, lbs (kg) ............... 705 (320)
Wet Weight, lbs (kg) ............... 749 (340)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 426 (2.94) at 250 rpm
Compression Pressure, Minimum, psi (MPa) ............... 327 (2.26) at 250 rpm
Compression Difference Between Cylinders, psi (MPa) ............... 43 (0.29)
Oil Pressure at Rated Speed, psi (MPa) ............... 43-64 (0.29-0.44)
Oil Pressure at Idle Speed, psi (MPa) ............... 11 (0.08)
Cooling System Radiator Cap Pressure, psi (kPa) ............... 12.8 (88.3)
Oil Temperature Standard, F (C) ............... 176-212 (80-100)
Thermostat Valve Opening Temperature, F (C) ............... 169 (76.0)
Thermostat Valve Full Open Temperature, F (C) ............... 194 (90.0)
Drive Belt Tension (New V-Belt Deflection), in (mm) ............... 0.39-0.51 (10.0-13.0)
Drive Belt Tension (Used V-Belt Deflection), in (mm) ............... 0.47-0.59 (12.0-15.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0138 (0.350)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0200 (0.508)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CH-4 or CI-4
Engine Oil Capacity (Maximum Pan Level), qt (L) ............... 10.0 (9.5)
Engine Oil Capacity (Minimum Pan Level), qt (L) ............... 7.9 (7.5)
Total Engine Oil Capacity with Filter, qt (L) ............... 11.1 (10.5)
Engine Coolant Capacity (Engine Only), qt (L) ............... 6.3 (6.0)
Cooling System Capacity with Radiator, qt (L) ............... 14.8 (14.0)

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) ............... 3.7401-3.7413 (95.000-95.030)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.7441 (95.100)
Cylinder Bore Out-of-Roundness, in (mm) ............... 0.0004 (0.010)
Cylinder Block Upper Surface Flatness, in (mm) ............... 0.0020 (0.050)
Cylinder Liner Outside Diameter, in (mm) ............... 3.8976-3.8988 (99.000-99.030)
Cylinder Block Liner Bore Inside Diameter, in (mm) ............... 3.8996-3.9008 (99.050-99.080)
Cylinder Liner to Block Bore Clearance, in (mm) ............... 0.0008-0.0031 (0.020-0.080)
Main Journal Outside Diameter, in (mm) ............... 2.7559-2.7565 (70.000-70.015)
Main Journal Out-of-Roundness, in (mm) ............... 0.0004 (0.010)
Main Bearing Bore Inside Diameter, in (mm) ............... 2.9527-2.9535 (75.000-75.019)
Connecting Rod Journal Outside Diameter, in (mm) ............... 2.2441-2.2447 (57.000-57.015)
Crankshaft Main Bearing Shell Thickness, in (mm) ............... 0.0978-0.0984 (2.485-2.500)
Crankshaft Main Journal Clearance, in (mm) ............... 0.0016-0.0039 (0.040-0.100)
Crankshaft Axial End Play, in (mm) ............... 0.0027-0.0086 (0.070-0.220)
Crankshaft Center Main Journal Width, in (mm) ............... 1.4173-1.4189 (36.000-36.040)
Crankshaft Thrust Washer Thickness, in (mm) ............... 0.0893-0.0913 (2.270-2.320)
Connecting Rod Center-to-Center Length, in (mm) ............... 7.0866 (180.00)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.2606-1.2614 (32.020-32.040)
Connecting Rod Big End Bore Inside Diameter, in (mm) ............... 2.3622-2.3630 (60.000-60.020)
Connecting Rod Bearing Shell Thickness, in (mm) ............... 0.0584-0.0590 (1.485-1.500)
Connecting Rod Journal to Bearing Clearance, in (mm) ............... 0.0014-0.0035 (0.035-0.090)
Connecting Rod Side Clearance, in (mm) ............... 0.0039-0.0098 (0.100-0.250)
Piston Skirt Outside Diameter, in (mm) ............... 3.7362-3.7374 (94.900-94.930)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0027-0.0051 (0.070-0.130)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.2598-1.2604 (32.000-32.015)
Piston Pin Outside Diameter, in (mm) ............... 1.2594-1.2598 (31.990-32.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0009 (0.000-0.025)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0007-0.0019 (0.020-0.050)
Top Ring Groove Width, in (mm) ............... 0.0818-0.0830 (2.080-2.110)
Second Ring Groove Width, in (mm) ............... 0.0799-0.0807 (2.030-2.050)
Oil Ring Groove Width, in (mm) ............... 0.1582-0.1590 (4.020-4.040)
Top Ring Thickness, in (mm) ............... 0.0767-0.0779 (1.950-1.980)
Second Ring Thickness, in (mm) ............... 0.0759-0.0771 (1.930-1.960)
Oil Ring Thickness, in (mm) ............... 0.1562-0.1574 (3.970-4.000)
Top Ring Groove Side Clearance, in (mm) ............... 0.0039-0.0063 (0.100-0.160)
Second Ring Groove Side Clearance, in (mm) ............... 0.0027-0.0047 (0.070-0.120)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0007-0.0027 (0.020-0.070)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Second Ring End Gap, in (mm) ............... 0.0137-0.0216 (0.350-0.550)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0177 (0.250-0.450)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.050)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.3129-0.3135 (7.948-7.962)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.3118-0.3124 (7.920-7.935)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.3150-0.3156 (8.000-8.015)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.3150-0.3156 (8.000-8.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0026 (0.038-0.067)
Exhaust Valve Stem to Guide Clearance Standard, in (mm) ............... 0.0025-0.0037 (0.065-0.095)
Valve Guide Protrusion Above Cylinder Head Spring Pocket, in (mm) ............... 0.551-0.590 (14.0-15.0)
Intake Valve Head Thickness, in (mm) ............... 0.059-0.071 (1.50-1.80)
Exhaust Valve Head Thickness, in (mm) ............... 0.059-0.071 (1.50-1.80)
Intake Valve Recess Level, in (mm) ............... 0.027-0.043 (0.70-1.10)
Exhaust Valve Recess Level, in (mm) ............... 0.027-0.043 (0.70-1.10)
Valve Seat Angle (Intake and Exhaust), degrees ............... 45
Valve Face Contact Width, in (mm) ............... 0.055-0.071 (1.40-1.80)
Valve Spring Free Length, in (mm) ............... 1.929 (49.00)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.7858-0.7866 (19.960-19.980)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.7874-0.7886 (20.000-20.030)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0008-0.0027 (0.020-0.070)
Camshaft Bushing Bore Inside Diameter, in (mm) ............... 2.1653-2.1665 (55.000-55.030)
Camshaft Journal Outside Diameter (Front), in (mm) ............... 2.1629-2.1641 (54.940-54.970)
Camshaft Journal Outside Diameter (Center), in (mm) ............... 2.1523-2.1535 (54.670-54.700)
Camshaft Journal Outside Diameter (Rear), in (mm) ............... 2.1425-2.1437 (54.420-54.450)
Camshaft Journal to Bushing Clearance, in (mm) ............... 0.0011-0.0035 (0.030-0.090)
Camshaft Axial End Play, in (mm) ............... 0.0027-0.0086 (0.070-0.220)
Intake Cam Lobe Height, in (mm) ............... 1.6377-1.6456 (41.600-41.800)
Exhaust Cam Lobe Height, in (mm) ............... 1.6377-1.6456 (41.600-41.800)
Crankshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Camshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Injection Pump Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Oil Pump Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.4948-1.4956 (37.970-37.990)
Idler Gear Bushing Inside Diameter, in (mm) ............... 1.4960-1.4972 (38.000-38.030)
Idler Gear Shaft to Bushing Clearance, in (mm) ............... 0.0003-0.0023 (0.010-0.060)

Tightening Torques

Cylinder Head Bolt (Step 1), lb-ft (Nm) ............... 51 (69)
Cylinder Head Bolt (Step 2), lb-ft (Nm) ............... 80 (108)
Main Bearing Cap Bolt (Step 1), lb-ft (Nm) ............... 84 (114)
Main Bearing Cap Bolt (Step 2), lb-ft (Nm) ............... 98 (133)
Connecting Rod Cap Bolt, lb-ft (Nm) ............... 29-30 (39-41)
Flywheel Bolt, lb-ft (Nm) ............... 123-137 (167-186)
Crankshaft Pulley Damper Bolt, lb-ft (Nm) ............... 145-159 (196-216)
Camshaft Gear Thrust Plate Bolt, lb-ft (Nm) ............... 18-22 (24-30)
Idler Gear Shaft Retaining Bolt, lb-ft (Nm) ............... 51-58 (69-79)
Rocker Arm Shaft Bracket Mounting Bolt, lb-ft (Nm) ............... 22-26 (30-35)
Valve Lash Adjusting Locknut Torque, lb-ft (Nm) ............... 14-18 (19-24)
Cylinder Head Rocker Cover Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Exhaust Manifold Mounting Bolt, lb-ft (Nm) ............... 25-33 (34-44)
Intake Manifold Assembly Mounting Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Oil Pan Mounting Perimeter Bolt, lb-ft (Nm) ............... 14-18 (19-24)
Oil Pan Bottom Drain Plug, lb-ft (Nm) ............... 43-58 (59-78)
Oil Pump Housing Mounting Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Oil Pressure Regulator Relief Valve Plug, lb-ft (Nm) ............... 29-36 (39-49)
Water Pump Housing Mounting Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Coolant Thermostat Housing Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Fuel Pump Drive Gear Nut, lb-ft (Nm) ............... 43-51 (59-69)
Fuel Pump Housing Mounting Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Fuel Injector Assembly Clamp Bolt, lb-ft (Nm) ............... 18-22 (24-30)
Fuel Injection High Pressure Line Nut , lb-ft (Nm) ............... 22-25 (30-34)
Fuel Overflow Return Line Pipe Bolt, lb-ft (Nm) ............... 14-18 (19-24)
Fuel Feed Supply Plunger Pump Mounting Bolt, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Fuel Filter Bracket Base Mounting Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Starter Motor Main Flange Mounting Bolt, lb-ft (Nm) ............... 58-72 (78-98)
Alternator Pivot and Tension Adjustment Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Glow Plug Terminal Body Installation, lb-ft (Nm) ............... 11-14 (15-19)
Glow Plug Wiring Harness Small Hex Nut, lb-ft (Nm) ............... 1.1-1.4 (1.5-1.9)
Engine Mounting Bracket To Block Frame Bolt, lb-ft (Nm) ............... 58-72 (78-98)
Flywheel Housing Outer Perimeter Bolt, lb-ft (Nm) ............... 58-72 (78-98)
Timing Gear Case Cover Face Bolt, lb-ft (Nm) ............... 14-18 (19-24)
Air Compressor Mounting Flange Bolt, lb-ft (Nm) ............... 51-58 (69-79)
Turbocharger Turbine Housing Oil Feed Line Bolt, lb-ft (Nm) ............... 14-18 (19-24)
Turbocharger Turbine Housing Oil Drain Line Bolt, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Turbocharger Exhaust Inlet Mounting Flange Nut, lb-ft (Nm) ............... 25-33 (34-44)
Oil Cooler Housing Interface Attaching Bolt, lb-ft (Nm) ............... 18-24 (24-33)
Fan Hub Assembly Pulley Retaining Nut, lb-ft (Nm) ............... 43-51 (59-69)
Coolant Jacket Block Side Drain Plug, lb-ft (Nm) ............... 18-24 (24-33)
Oil Pressure Sensor Sending Unit, lb-ft (Nm) ............... 11-14 (15-19)
Coolant Temperature Sensor, lb-ft (Nm) ............... 14-18 (19-24)

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• Komatsu Engines Specs
  
• Komatsu 4D92E Specs
  
• Komatsu 4D94LE Specs
  
• Komatsu 4D95S Specs
  
• Komatsu 4D95L Specs
  

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