________________________________________________________________________________

Komatsu 4D92E Engine

General Technical Data

Engine Specifications

Engine Model ............... Komatsu 4D92E
Engine Type ............... 4-cycle vertical inline liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.62 (92.0)
Engine Stroke, in (mm) ............... 3.94 (100.0)
Displacement, cu.in (L) ............... 162.26 (2.659)
Rated Engine Power, hp (kW) ............... 45.3 (33.8)
Rated Engine Speed, rpm ............... 2450
Peak Torque ............... 147 Nm (108.4 lb-ft) at 1600 rpm
Low Idle Speed, rpm ............... 750-850
High Idle Speed, rpm ............... 2600-2700
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 21.5:1
Firing Order ............... 1-3-4-2
Combustion Chamber ............... Swirl chamber type
Piston Type ............... Aluminum alloy autothermic with strut
Camshaft Drive Type ............... Gear train driven helical gears
Direction of Rotation ............... Counterclockwise viewed from flywheel side
Cylinder Block Type ............... Monoblock cast iron
Cylinder Head Type ............... Single piece cast iron
Lubrication System ............... Forced pressure feed
Oil Pump Type ............... Trochoid gear driven type
Oil Filter Type ............... Full-flow cartridge spin-on
Cooling System ............... Forced liquid circulation radiator
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
Alternator Output ............... 40A

Fuel System

Fuel Injection Pump Type ............... Bosch VE distributor type
Governor Type ............... Mechanical all-speed centrifugal governor
Timer Type ............... Hydraulic automatic advance timer
Fuel Feed Pump Type ............... Vane type integrated in injection pump
Fuel Injection Nozzle Type ............... Throttle type nozzle
Nozzle Opening Pressure, psi (MPa) ............... 1784-1929 (12.3-13.3)
Fuel Injection Timing, deg ............... 12-14 BTDC
Fuel Filter Type ............... High efficiency spin-on element with water sedimenter
Fuel Delivery Pressure, psi (MPa) ............... 2.9-4.4 (0.02-0.03)
Fuel Return Line Max Pressure, psi (MPa) ............... 2.9 (0.02)
Recommended Fuel Grade ............... Diesel oil ISO 8217 DMA or BS 2869 A1
Minimum Fuel Cetane Number ............... 45
Injection Pump Lubrication Type ............... Self-lubricated by diesel fuel
Plunger Diameter, in (mm) ............... 0.39 (10.0)
Plunger Stroke, in (mm) ............... 0.28 (7.0)
Delivery Valve Opening Pressure, psi (MPa) ............... 261 (1.8)
Nozzle Holder Type ............... Screw-in type flange assembly
Over-flow Valve Cracking Pressure, psi (MPa) ............... 21.8 (0.15)

Dimensions and Weight

Overall Length, in (mm) ............... 22.8 (580)
Overall Width, in (mm) ............... 19.7 (500)
Overall Height, in (mm) ............... 26.6 (675)
Dry Weight, lbs (kg) ............... 496 (225)
Wet Weight, lbs (kg) ............... 529 (240)

Maintenance Data

Service Information

Compression Standard Pressure, psi (MPa) ............... 412-441 (2.84-3.04)
Minimum Allowable Compression Pressure, psi (MPa) ............... 341 (2.35)
Oil Pressure at Low Idle, psi (MPa) ............... 9.8 (0.068)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.294-0.392)
Maximum Oil Temperature, F (C) ............... 230 (110)
Thermostat Initial Opening Temperature, F (C) ............... 160 (71)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
Radiator Cap Pressure Valve Opening, psi (kPa) ............... 12.8 (88.3)
Fan Belt Deflection under 10 kg force, in (mm) ............... 0.39-0.59 (10.0-15.0)
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
Engine Oil Capacity (Max), qt (L) ............... 5.8 (5.5)
Engine Oil Capacity (Min), qt (L) ............... 3.7 (3.5)
Coolant Total Capacity, qt (L) ............... 7.4 (7.0)

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) ............... 3.6220-3.6232 (92.000-92.030)
Cylinder Bore Wear Maximum, in (mm) ............... 0.0079 (0.200)
Cylinder Bore Taper Ovality Maximum, in (mm) ............... 0.0008 (0.020)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 2.1634-2.1642 (54.950-54.970)
Crankpin Journal Outer Diameter, in (mm) ............... 1.8878-1.8886 (47.950-47.970)
Main Bearing Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0028 (0.035-0.072)
Crankshaft Axial End Play, in (mm) ............... 0.0043-0.0083 (0.110-0.210)
Thrust Bearing Thickness, in (mm) ............... 0.0783-0.0803 (1.990-2.040)
Connecting Rod Center to Center Length, in (mm) ............... 5.7087 (145.000)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1815-1.1823 (30.010-30.030)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Piston Skirt Outer Diameter, in (mm) ............... 3.6197-3.6209 (91.940-91.970)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0012-0.0024 (0.030-0.060)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.1811-1.1815 (30.000-30.010)
Piston Pin Outer Diameter, in (mm) ............... 1.1807-1.1811 (29.989-30.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0008 (0.000-0.021)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0803-0.0811 (2.040-2.060)
Oil Ring Groove Width, in (mm) ............... 0.1185-0.1193 (3.010-3.030)
Top Ring Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Second Ring Side Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Second Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Cylinder Head Distortion Plane Levelness, in (mm) ............... 0.0012 (0.030)
Cylinder Block Top Surface Distortion Levelness, in (mm) ............... 0.0020 (0.050)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3126-0.3134 (7.940-7.960)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3122-0.3130 (7.930-7.950)
Valve Guide Inner Diameter, in (mm) ............... 0.3154-0.3161 (8.010-8.030)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Intake Valve Sink Depth, in (mm) ............... 0.0276-0.0354 (0.700-0.900)
Exhaust Valve Sink Depth, in (mm) ............... 0.0276-0.0354 (0.700-0.900)
Intake Valve Seat Width, in (mm) ............... 0.0472-0.0591 (1.200-1.500)
Exhaust Valve Seat Width, in (mm) ............... 0.0472-0.0591 (1.200-1.500)
Valve Seat Angle, deg ............... 45
Valve Spring Free Length, in (mm) ............... 1.6535 (42.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.7697-1.7705 (44.950-44.970)
Camshaft Journal Outer Diameter (Center), in (mm) ............... 1.7697-1.7705 (44.950-44.970)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.7697-1.7705 (44.950-44.970)
Camshaft Bearing Clearance, in (mm) ............... 0.0016-0.0035 (0.040-0.090)
Cam Lobe Height (Intake), in (mm) ............... 1.4390-1.4429 (36.550-36.650)
Cam Lobe Height (Exhaust), in (mm) ............... 1.4390-1.4429 (36.550-36.650)
Camshaft Axial End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.7854-0.7862 (19.950-19.970)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.7874-0.7886 (20.000-20.030)
Rocker Arm Shaft to Bushing Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Tappet Stem Outer Diameter, in (mm) ............... 0.4705-0.4713 (11.950-11.970)
Tappet Guide Hole Inner Diameter, in (mm) ............... 0.4724-0.4736 (12.000-12.030)
Tappet Stem to Guide Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)

Tightening Torques

Cylinder Head Bolt (Step 1) ............... 29.5 lb-ft (40.0 Nm)
Cylinder Head Bolt (Step 2) ............... 59.0 lb-ft (80.0 Nm)
Cylinder Head Bolt (Step 3) ............... 62.7-66.4 lb-ft (85.0-90.0 Nm)
Connecting Rod Cap Bolt (Step 1) ............... 22.1 lb-ft (30.0 Nm)
Connecting Rod Cap Bolt (Step 2) ............... 39.8-43.5 lb-ft (54.0-59.0 Nm)
Main Bearing Cap Bolt (Step 1) ............... 36.9 lb-ft (50.0 Nm)
Main Bearing Cap Bolt (Step 2) ............... 70.8-75.2 lb-ft (96.0-102.0 Nm)
Flywheel Bolt ............... 59.0-64.9 lb-ft (80.0-88.0 Nm)
Crankshaft Pulley Central Bolt ............... 83.3-92.2 lb-ft (113.0-125.0 Nm)
Camshaft Thrust Plate Bolt ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Camshaft Timing Gear Bolt ............... 43.5-50.7 lb-ft (59.0-68.8 Nm)
Rocker Arm Shaft Support Bolt ............... 17.4-21.7 lb-ft (23.5-29.4 Nm)
Cylinder Head Cover Cap Nut ............... 5.1-7.2 lb-ft (6.9-9.8 Nm)
Oil Pan Mounting Bolt ............... 7.2-9.4 lb-ft (9.8-12.7 Nm)
Oil Pan Drain Plug ............... 28.9-36.1 lb-ft (39.2-49.0 Nm)
Flywheel Housing Mounting Bolt ............... 28.9-36.1 lb-ft (39.2-49.0 Nm)
Timing Gear Case Mounting Bolt ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Timing Gear Cover Mounting Bolt ............... 7.2-9.4 lb-ft (9.8-12.7 Nm)
Fuel Injection Pump Drive Gear Nute ............... 43.5-50.7 lb-ft (59.0-68.8 Nm)
Fuel Injection Pump Fixing Nut ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Fuel Injection Nozzle Holder Assembly ............... 36.1-43.5 lb-ft (49.0-59.0 Nm)
Fuel Injection Nozzle Nut ............... 25.3-28.9 lb-ft (34.3-39.2 Nm)
Fuel High Pressure Pipe Nut ............... 18.1-21.7 lb-ft (24.5-29.4 Nm)
Fuel Return Line Joint Bolt ............... 7.2-10.8 lb-ft (9.8-14.7 Nm)
Water Pump Mounting Bolt............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Cooling Fan Drive Pulley Bolt ............... 7.2-9.4 lb-ft (9.8-12.7 Nm)
Thermostat Housing Cover Bolt ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Intake Manifold Mounting Bolt ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Exhaust Manifold Mounting Bolt ............... 18.1-21.7 lb-ft (24.5-29.4 Nm)
Starter Motor Mounting Bolt ............... 28.9-36.1 lb-ft (39.2-49.0 Nm)
Alternator Mounting Pivot Bolt ............... 25.3-32.5 lb-ft (34.3-44.1 Nm)
Alternator Adjusting Link Lock Bolt ............... 14.5-17.4 lb-ft (19.6-23.5 Nm)
Oil Pump Cover Plate Screws ............... 5.1-7.2 lb-ft (6.9-9.8 Nm)
Oil Pressure Switch Sensor ............... 10.8-14.5 lb-ft (14.7-19.6 Nm)
Glow Plug Into Cylinder Head ............... 10.8-14.5 lb-ft (14.7-19.6 Nm)
Glow Plug Power Cable Connector ............... 1.1-1.4 lb-ft (1.5-1.9 Nm)

________________________________________________________________________________________

• Komatsu Engines Specs
  
• Komatsu 4D94LE Specs
  
• Komatsu 4D95S Specs
  
• Komatsu 4D95L Specs
  
• Komatsu 4D95LE Specs
  

______________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________