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Komatsu 4D95S Engine

General Technical Data

Engine Specifications

Engine Model ............... Komatsu 4D95S
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) ............... 3.74 (95.0)
Displacement, cu.in (L) ............... 164.1 (2.69)
Rated Engine Power, hp (kW) ............... 39-45 (28-33)
Rated Engine Speed, rpm ............... 2450-2800
Peak Torque ............... 150-155 Nm (111-114 lb-ft) at 1300-2000 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2450 rpm
Compression Ratio ............... 18.0:1
Firing Order ............... 1-3-4-2
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
Starting System ............... Electric Starter
Electrical System ............... 12V or 24V

Fuel System

Injection Pump Type ............... Bosch PES-A inline mechanical injection pump
Governor Type ............... Centrifugal mechanical all-speed governor
Feed Pump Type ............... Mechanical plunger type driven by camshaft eccentric
Fuel Injection Timing ............... 14-16 degrees BTDC
Injection Nozzle Type ............... Multi-hole throttle nozzle
Nozzle Opening Pressure, psi (MPa) ............... 2842-2987 (19.6-20.6)
Fuel Filter Type ............... Spin-on element cartridge with integrated water separator
Fuel Transfer Pressure, psi (bar) ............... 14.5-29.0 (1.0-2.0)
Maximum Fuel Return Line Pressure, inHg (mmHg) ............... 2.95 (75.0)
Fuel Tank Vent Pressure, psi (kPa) ............... 0.44-0.73 (3.0-5.0)
Injection Line Inner Diameter, in (mm) ............... 0.078 (2.0)
Injection Line Outer Diameter, in (mm) ............... 0.236 (6.0)
Nozzle Holder Type ............... Flange mounted lock type with copper crush washer seal
Fuel Leak-off Configuration ............... External steel pipe manifold connected back to tank filter return line
Cold Start Device Type ............... Intake air glow plugs or heater element ribbon matrix pack
Glow Plug Current Draw, A ............... 10.0-12.0 per individual plug element
Minimum Fuel Cetane Rating ............... 45 minimum rating indices value
Primary Fuel Filter Micron Rating, microns ............... 10.0-12.0 filtration absolute index
Secondary Fuel Filter Micron Rating, microns ............... 2.0-4.0 secondary absolute filtration rating
Fuel Supply Pump Relief Valve Pressure, psi (kPa) ............... 21.7-26.1 (150.0-180.0)
Fuel Pump Camshaft End Play, in (mm) ............... 0.0019-0.0059 (0.05-0.15)

Dimensions and Weight

Overall Length, in (mm) ............... 30.2-30.8 (765-785)
Overall Width, in (mm) ............... 20.8-23.5 (530-600)
Overall Height, in (mm) ............... 29.5-38.2 (750-970)
Dry Weight, lbs (kg) ............... 595-628 (270-285)

Maintenance Data

Service Information

Cylinder Compression Pressure, psi (MPa) ............... 426.6 (2.94)
Oil Pressure At Rated Speed, psi (MPa) ............... 28.4-56.8 (0.20-0.39)
Oil Pressure At Low Idle, psi (MPa) ............... 9.9 (0.07)
Radiator Cap Opening Pressure, psi (kPa) ............... 10.1-12.7 (70.0-88.0)
Thermostat Primary Initial Opening, F (C) ............... 165.2 (74.0-78.0)
Thermostat Full Open Position, F (C) ............... 194.0 (90.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.0137 (0.35)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0196 (0.50)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CF-4 or CH-4
Engine Oil Capacity Including Filter, qt (L) ............... 7.4-8.9 (7.0-8.4)
Cooling System Capacity, qt (L) ............... 5.2-6.3 (5.0-6.0)

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 Inside Diameter, in (mm) ............... 3.7401-3.7411 (95.000-95.025)
Crankshaft Axial End Play, in (mm) ............... 0.0031-0.0102 (0.08-0.26)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0039-0.0098 (0.10-0.25)
Main Bearing Shell Journal Clearance, in (mm) ............... 0.0015-0.0039 (0.040-0.100)
Main Bearing Bore Inside Diameter, in (mm) ............... 2.9527-2.9537 (75.000-75.025)
Main Bearing Shell Thickness, in (mm) ............... 0.0972-0.0976 (2.470-2.480)
Connecting Rod Bearing Shell Thickness, in (mm) ............... 0.0775-0.0779 (1.970-1.980)
Connecting Rod Bearing Journal Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Connecting Rod Small End Bore I.D, in (mm) ............... 1.2598-1.2608 (32.000-32.025)
Connecting Rod Big End Bore I.D, in (mm) ............... 2.4015-2.4023 (61.000-61.020)
Piston Skirt Outside Diameter, in (mm) ............... 3.7346-3.7358 (94.860-94.890)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0043-0.0064 (0.110-0.165)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0004-0.0011 (0.012-0.030)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0001-0.0003 (0.004-0.009)
Piston Pin Outside Diameter, in (mm) ............... 1.1811-1.1815 (30.000-30.010)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1816-1.1822 (30.012-30.030)
Top Ring Groove Width, in (mm) ............... 0.0811-0.0818 (2.060-2.080)
Second Ring Groove Width, in (mm) ............... 0.0803-0.0811 (2.040-2.060)
Oil Ring Groove Width, in (mm) ............... 0.1582-0.1590 (4.020-4.040)
Top Piston Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
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) ............... 0.0098-0.0157 (0.25-0.40)
Valve Guide Inside Diameter, in (mm) ............... 0.3149-0.3157 (8.000-8.018)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.3133-0.3141 (7.960-7.980)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.3118-0.3125 (7.920-7.940)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0007-0.0022 (0.020-0.058)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0038 (0.060-0.098)
Intake Valve Seat Angle, degrees ............... 30
Exhaust Valve Seat Anglex, degrees ............... 45
Intake Valve Face Angle, degrees ............... 30
Exhaust Valve Face Angle, degrees ............... 45
Valve Head Margin Thickness in (mm) ............... 0.0393-0.0590 (1.00-1.50)
Valve Head Sinkage Depth, in (mm) ............... 0.0236-0.0433 (0.60-1.10)
Valve Spring Free Length, in (mm) ............... 1.8897 (48.00)
Camshaft Housing Inside Diameter, in (mm) ............... 2.1259-2.1271 (54.000-54.030)
Camshaft Bushing Outer Diameter, in (mm) ............... 2.1299-2.1314 (54.100-54.140)
Camshaft Bushing to Crankcase Clearance, in (mm) ............... 0.0027-0.0055 (0.070-0.140)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0019-0.0043 (0.050-0.110)
Cam Lobe Height (Intake), in (mm) ............... 1.6377 (41.60)
Cam Lobe Height (Exhaust), in (mm) ............... 1.6377 (41.60)
Camshaft Axial End Play, in (mm) ............... 0.0027-0.0086 (0.07-0.22)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.7854-0.7862 (19.950-19.970)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.7874-0.7885 (20.000-20.030)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)

Tightening Torques

Cylinder Head Cap Bolts (1-Stage), lb-ft (Nm) ............... 50.8 (69.0)
Cylinder Head Cap Bolts (2-Stage), lb-ft (Nm) ............... 83.3 (113.0)
Cylinder Head Cap Bolts (3-Stage), lb-ft (Nm) ............... 106.9-114.3 (145.0-155.0)
Main Bearing Cap Bolts (1-Stage), lb-ft (Nm) ............... 83.3 (113.0)
Main Bearing Cap Bolts (2-Stage), lb-ft (Nm) ............... 97.3 (132.0)
Connecting Rod Big End Cap Bolts, lb-ft (Nm) ............... 29.5 (40.0)
Flywheel Central Bolts, lb-ft (Nm) ............... 94.0-101.1 (127.4-137.2)
Crankshaft V-Pulley Damper Bolt, lb-ft (Nm) ............... 137.4-148.2 (186.3-201.0)
Camshaft Thrust Plate Retaining Screws, lb-ft (Nm) ............... 17.3-23.8 (23.5-32.3)
Camshaft Drive Gear Central Mounting Bolt, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Crankcase Gear Cover Retaining Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Front Gear Train Idler Shaft Bolt, lb-ft (Nm) ............... 24.5-31.1 (33.3-42.1)
Rocker Arm Shaft Support Bracket Nuts, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Valve Lash Adjusting Screw Jam Lock Nut, lb-ft (Nm) ............... 12.2-15.9 (16.6-21.6)
Valve Cover Outer Cap Acorn Nuts, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Oil Pan Deep Mounting Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Oil Pan Sump Plug, lb-ft (Nm) ............... 43.3-57.8 (58.8-78.4)
Oil Pump Assembly Cap Screws, lb-ft (Nm) ............... 7.2-9.4 (9.8-12.7)
Oil Pump Body Attachment Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Oil Pressure Relief Valve Plunger Screw, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Water Pump Assembly Body Fasteners, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Cooling Thermostat Housing Top Cap Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Cooling Fan Blade Assembly Bolts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Intake Manifold Mounting Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Exhaust Manifold Mounting Bolts, lb-ft (Nm) ............... 21.6-28.9 (29.4-39.2)
Fuel Pump Drive Gear Attachment Lock Nut, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Fuel Pump Housing Body Mounting Bolts, lb-ft (Nm) ............... 17.3-23.8 (23.5-32.3)
Fuel Injector High Pressure Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Fuel Injector Nozzle Holder Clamp Nuts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Fuel Pump Delivery Valve Holder Body Caps, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Oil Filter Header Core Element Bracket Bolts, lb-ft (Nm) ............... 17.3-23.8 (23.5-32.3)
Oil Cooler Core Element Mounting Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Electric Starter Drive Flange Gearbox Bolts, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Alternator Charging Unit Front Bolt, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Alternator Tension Adjusting Sliding Bolt, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)
Engine Support Block Rear Flywheel Housing Bolts, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Oil Pan Level Indicator Dipstick Tube Adaptor Union, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Intake Manifold Induction Air Glow Plug, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Coolant Temperature Gauge Sending Unit Sensor, lb-ft (Nm) ............... 18.0-25.2 (24.5-34.3)
Oil System Pressure Switch, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Crankcase Breather Attachment Screws, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Air Compressor Drive Mounting Nut, lb-ft (Nm) ............... 57.8-65.1 (78.4-88.2)
Fuel Filter Mounting Header Base Bracket Bolts, lb-ft (Nm) ............... 14.4-19.5 (19.6-26.4)

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• Komatsu Engines Specs
  
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• Komatsu 4D95LE Specs
  

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