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Komatsu 4D95L Engine

General Technical Data

Engine Specifications

Engine Model ............... Komatsu 4D95L
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) ............... 54-127 (40-95)
Rated Engine Speed, rpm ............... 1850-3000
Peak Torque ............... 200-235 Nm (147-173 lb-ft) at 1500-1600 rpm
High Idle Speed ............... 2100-2400 rpm
Low Idle Speed ............... 700-800 rpm
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 17.0:1-18.0:1
Firing Order ............... 1-2-4-3
Direction of Crankshaft Rotation ............... Clockwise viewed from the front timing belt end
Piston Type ............... Autothermic aluminum alloy with iron strut
Combustion Chamber ............... Direct injection toroidal bowl in piston crown
Crankshaft Material ............... Forged steel with induction hardened journals
Camshaft Drive Type ............... Gear-driven train via front timing gearcase
Main Bearing Shell Type ............... Steel-backed tri-metal alloy precision inserts
Connecting Rod Bearing Type ............... Precision tri-metal alloy liners
Cylinder Liner Configuration ............... Parent bore linerless cylinder block design
Valve Train Layout ............... Overhead valve actuated via pushrods and rocker arms
Number of Valves Per Cylinder ............... 2 (1 intake, 1 exhaust)
Cylinder Block Type ............... Heavy-duty monoblock cast iron
Cylinder Head Type ............... Single-piece cast iron overhead valve design
Lubrication System ............... Forced circulation lubrication by gear pump
Oil Pump Type ............... Gear-driven internal gear pump
Oil Filter Type ............... Full-flow, replaceable spin-on cartridge
Cooling System ............... Forced circulation liquid-cooled with thermostat bypass
Water Pump Type ............... Belt-driven centrifugal impeller type
Air Cleaner Type ............... Centrifugal dry dual element with evacuator valve
Starting System ............... Electric motor starter
Electrical System ............... 24V
Alternator Capacity ............... 25A or 35A

Fuel System

Injection Pump Model ............... Bosch type PES-A inline injection pump
Fuel Feed Pump Type ............... Mechanical plunger type driven by injection pump camshaft
Governor Type ............... Centrifugal all-speed mechanical governor
Governor Model designation ............... Bosch RSV mechanical variable speed governor
Governor High Speed Regulation ............... 10-12 percent droop rate
Fuel Injection Method ............... Direct mechanical injection into combustion bowl
Fuel System Primary Filtration ............... Wire mesh gauze filter in fuel tank suction line
Fuel System Secondary Filtration ............... High efficiency spin-on paper element filter cartridge
Injection Nozzle Holder Model ............... Bosch multi-hole nozzle assembly
Nozzle Injection Opening Pressure ............... 19.6-20.6 MPa (196-206 bar)
Fuel Injection Timing Advance ............... 12-16 degrees before top dead center
Fuel Overflow Valve Crack Pressure ............... 0.15-0.25 MPa (1.5-2.5 bar)
Fuel Transfer Pump Delivery Pressure ............... 0.18-0.30 MPa (1.8-3.0 bar)
Fuel Priming Pump Type ............... Manual plunger mechanical type integrated on feed pump
Fuel Feed Line Diameter ............... 0.315 in (8.0 mm)
Fuel Return Line Diameter ............... 0.236 in (6.0 mm)
Injection Pipe Outer Diameter ............... 0.250 in (6.35 mm)
Injection Pipe Inner Diameter ............... 0.078 in (2.0 mm)
Number of Nozzle Spray Orifices ............... 4 or 5 holes
Nozzle Orifice Diameter ............... 0.0098-0.0118 in (0.25-0.30 mm)
Maximum Fuel System Pressure ............... 29.4 MPa (294 bar)
Fuel Shutdown Control ............... 24V electric solenoid valve acting on rack
Fuel Tank Head Pressure Maximum ............... 3.28 ft (1.0 m)
Maximum Allowed Fuel Inlet Temperature ............... 140 F (60 C)
Fuel Filter Water Separator Capacity ............... 0.211 US gal (0.8 L)
Fuel System Air Bleeding Mechanism ............... Automatic air bleed return line circuit
Maximum Fuel Consumption Rate ............... 2.9-3.7 US gal/h (11.0-14.0 L/h)

Dimensions and Weight

Overall Length ............... 37.3 in (950 mm)
Overall Width ............... 25.2 in (640 mm)
Overall Height ............... 42.6 in (1080 mm)
Dry Weight ............... 662 lbs (300 kg)
Wet Weight ............... 717 lbs (325 kg)

Maintenance Data

Service Information

Oil Pressure at Rated Speed ............... 0.29-0.44 MPa (2.9-4.4 bar)
Oil Pressure at Idle Speed ............... 0.07 MPa (0.7 bar)
Maximum Permissible Oil Temperature ............... 230 F (110 C)
Standard Coolant Operating Temperature ............... 176-194 F (80-90 C)
Thermostat Valve Opening Temperature ............... 169 F (76.5 C)
Thermostat Valve Full Open Temperature ............... 194 F (90 C)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CH-4 or CI-4
Engine Oil Capacity (Max Level) ............... 2.51 US gal (9.5 L)
Engine Oil Capacity (Min Level) ............... 1.98 US gal (7.5 L)
Total Engine Oil Capacity with Filter ............... 2.77 US gal (10.5 L)
Coolant Capacity (Engine Block) ............... 1.58 US gal (6.0 L)
Coolant Capacity with Radiator ............... 3.70-4.75 US gal (14.0-18.0 L)

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 ............... 3.7402-3.7413 in (95.000-95.030 mm)
Cylinder Bore I.D Maximum Wear Limit ............... 3.7461 in (95.150 mm)
Cylinder Bore Roundness Maximum ............... 0.00079 in (0.020 mm)
Crankshaft Main Journal Diameter ............... 2.7559-2.7565 in (70.000-70.015 mm)
Crankshaft Main Bearing Clearance ............... 0.0016-0.0035 in (0.040-0.090 mm)
Connecting Rod Journal Diameter ............... 2.2441-2.2447 in (57.000-57.015 mm)
Connecting Rod Bearing Clearance ............... 0.0016-0.0033 in (0.040-0.085 mm)
Crankshaft Axial End Play ............... 0.0051-0.0138 in (0.130-0.350 mm)
Connecting Rod Side Clearance ............... 0.0059-0.0118 in (0.150-0.300 mm)
Connecting Rod Big End Bore I.D ............... 2.3622-2.3628 in (60.000-60.015 mm)
Piston Skirt Outer Diameter ............... 3.7354-3.7366 in (94.880-94.910 mm)
Piston To Cylinder Wall Clearance ............... 0.0035-0.0059 in (0.090-0.150 mm)
Piston Pin Bore Inner Diameter ............... 1.1812-1.1816 in (30.002-30.013 mm)
Piston Pin Outer Diameter ............... 1.1807-1.1811 in (29.990-30.000 mm)
Piston Pin To Piston Pin Bore Clearance ............... 0.00008-0.00091 in (0.002-0.023 mm)
Piston Pin To Small End Bushing Clearance ............... 0.00047-0.00118 in (0.012-0.030 mm)
Top Ring End Gap ............... 0.0098-0.0157 in (0.250-0.400 mm)
Second Ring End Gap ............... 0.0079-0.0138 in (0.200-0.350 mm)
Oil Ring End Gap ............... 0.0079-0.0157 in (0.200-0.400 mm)
Top Ring Side Clearance ............... 0.0028-0.0045 in (0.070-0.115 mm)
Second Ring Side Clearance ............... 0.0016-0.0031 in (0.040-0.080 mm)
Oil Ring Side Clearance ............... 0.0012-0.0028 in (0.030-0.070 mm)
Cylinder Head Flatness Distortion Maximum ............... 0.0019 in (0.050 mm)
Cylinder Block Top Surface Flatness Distortion ............... 0.0020 in (0.050 mm)
Intake Valve Stem Outer Diameter ............... 0.3126-0.3134 in (7.940-7.960 mm)
Intake Valve Stem To Guide Clearance ............... 0.0012-0.0026 in (0.030-0.065 mm)
Exhaust Valve Stem Outer Diameter ............... 0.3118-0.3126 in (7.920-7.940 mm)
Exhaust Valve Stem To Guide Clearance ............... 0.0020-0.0033 in (0.050-0.085 mm)
Valve Guide Inner Diameter ............... 0.3150-0.3157 in (8.000-8.018 mm)
Intake Valve Seat Depth Sinkage ............... 0.0276-0.0433 in (0.700-1.100 mm)
Exhaust Valve Seat Depth Sinkage ............... 0.0315-0.0472 in (0.800-1.200 mm)
Valve Spring Free Length ............... 1.8386 in (46.70 mm)
Camshaft Journal Diameter (Number 1) ............... 1.9685 in (50.000 mm)
Camshaft Journal Diameter (Number 2) ............... 1.9291 in (49.000 mm)
Camshaft Journal Diameter (Number 3) ............... 1.8898 in (48.000 mm)
Camshaft Journal Diameter (Number 4) ............... 1.8504 in (47.000 mm)
Camshaft Journal To Bushing Clearance ............... 0.0012-0.0035 in (0.030-0.090 mm)
Camshaft Axial End Play ............... 0.0031-0.0098 in (0.080-0.250 mm)
Cam Lobe Height (Intake) ............... 1.6378-1.6417 in (41.600-41.700 mm)
Cam Lobe Height (Exhaust) ............... 1.6772-1.6811 in (42.600-42.700 mm)
Rocker Shaft Outer Diameter ............... 0.7862-0.7870 in (19.970-19.990 mm)
Rocker Arm Bushing Inner Diameter ............... 0.7874-0.7885 in (20.000-20.028 mm)
Rocker Arm Bushing To Shaft Clearance ............... 0.0004-0.0023 in (0.010-0.058 mm)
Idler Gear Shaft Outer Diameter ............... 1.3374-1.3382 in (33.970-33.990 mm)
Idler Gear Bushing Inner Diameter ............... 1.3386-1.3396 in (34.000-34.025 mm)
Idler Gear Bushing To Shaft Clearance ............... 0.0004-0.0022 in (0.010-0.055 mm)

Tightening Torques

Cylinder Head Bolt (Step 1) ............... 90 Nm (66 lb-ft)
Cylinder Head Bolt (Step 2) ............... 125 Nm (92 lb-ft)
Cylinder Head Bolt (Step 3) ............... 150 Nm (111 lb-ft)
Main Bearing Cap Bolt (Step 1) ............... 115 Nm (85 lb-ft)
Main Bearing Cap Bolt (Step 2) ............... 135 Nm (100 lb-ft)
Connecting Rod Cap Bolt ............... 40 Nm (30 lb-ft)
Flywheel Retaining Bolts ............... 135-145 Nm (100-107 lb-ft)
Crankshaft Pulley Damper Bolt ............... 196-216 Nm (145-159 lb-ft)
Camshaft Thrust Plate Bolts ............... 24-29 Nm (18-21 lb-ft)
Camshaft Drive Gear Lock Nut ............... 88-98 Nm (65-72 lb-ft)
Rocker Arm Shaft Support Bracket Bolts ............... 34-44 Nm (25-32 lb-ft)
Valve Adjustment Screw Lock Nut ............... 18-24 Nm (13-18 lb-ft)
Timing Gear Case Housing Bolts ............... 20-26 Nm (15-19 lb-ft)
Timing Gear Case Cover Plate Screws ............... 10-14 Nm (7-10 lb-ft)
Oil Pump Assembly Mount Screws ............... 20-26 Nm (15-19 lb-ft)
Oil Pan Basin Assembly Flange Bolts ............... 20-26 Nm (15-19 lb-ft)
Oil Pan Bottom Basin Drain Plug ............... 60-70 Nm (44-52 lb-ft)
Fuel Pump Drive Gear Lock Nut ............... 59-69 Nm (44-51 lb-ft)
Fuel Pump Mounting Bracket Fasteners ............... 20-26 Nm (15-19 lb-ft)
Fuel Injection High Pressure Line Tube Nut ............... 25-34 Nm (18-25 lb-ft)
Fuel Injector Assembly Clamping Bolts ............... 20-26 Nm (15-19 lb-ft)
Fuel Spill Fuel Return Leak-Off Rail Banjo Bolts ............... 10-15 Nm (7-11 lb-ft)
Fuel Secondary Filter Mounting Bracket Bolts ............... 20-26 Nm (15-19 lb-ft)
Intake Manifold Header Cast Plenum Bolts ............... 20-26 Nm (15-19 lb-ft)
Exhaust Manifold Header Stud Nuts ............... 29-39 Nm (21-29 lb-ft)
Water Pump Assembly Bracket Mount Fasteners ............... 20-26 Nm (15-19 lb-ft)
Thermostat Cast Exit Housing Cover Bolts ............... 20-26 Nm (15-19 lb-ft)
Radiator Fan Assembly Blade Mount Screws ............... 10-14 Nm (7-10 lb-ft)
Alternator Pivoting Tensioner Clamp Bolt ............... 20-26 Nm (15-19 lb-ft)
Alternator Base Bracket Mounting Bolts ............... 44-54 Nm (32-40 lb-ft)
Electrical Starter Motor Housing Mounting Bolts ............... 78-93 Nm (58-69 lb-ft)
Oil Pressure Sensor Sender Switch ............... 12-18 Nm (9-13 lb-ft)
Coolant Temperature Sensor ............... 20-30 Nm (15-22 lb-ft)
Glow Plug Pre-Heating Element ............... 15-20 Nm (11-15 lb-ft)
Air Intake Grid Heating Element Fasteners ............... 20-26 Nm (15-19 lb-ft)
Front Crankshaft Oil Seal Carrier Screws ............... 10-14 Nm (7-10 lb-ft)
Rear Crankshaft Main Oil Seal Flange Bolts ............... 20-26 Nm (15-19 lb-ft)
Idler Gear Stub Shaft Flange Mount Bolts ............... 29-39 Nm (21-29 lb-ft)
Oil Delivery Suction Screen Tube Bolt ............... 20-26 Nm (15-19 lb-ft)
Oil Delivery Bypass Relief Pressure Valve Plug ............... 40-50 Nm (30-37 lb-ft)
Engine Rear Support Lifting Bracket Bolts ............... 44-54 Nm (32-40 lb-ft)
Engine Front Support Lifting Bracket Bolts ............... 44-54 Nm (32-40 lb-ft)
Rocker Arm Mechanism Top Cover Sealing Nuts ............... 8-12 Nm (6-9 lb-ft)
Low Pressure Supply Transfer Pump Bolts ............... 10-14 Nm (7-10 lb-ft)
Governor Rear Protective End Cover Screws ............... 5-8 Nm (4-6 lb-ft)
Oil Cooler Core Internal Plate Bolts ............... 20-26 Nm (15-19 lb-ft)
Oil Cooler Outer Housing Cover Bolts ............... 20-26 Nm (15-19 lb-ft)
Water Cock Drain Valve Plug ............... 20-30 Nm (15-22 lb-ft)

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• Komatsu Engines Specs
  
• Komatsu 4D92E Specs
  
• Komatsu 4D94LE Specs
  
• Komatsu 4D95S Specs
  
• Komatsu 4D95LE Specs
  

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