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Doosan DL06 Engine

The Doosan DL06 is a heavy-duty, 6-cylinder, 4-stroke, in-line, direct-injection diesel engine engineered primarily for demanding industrial and construction equipment applications. Operating with a 17.4:1 compression ratio, the engine utilizes an electronically controlled, turbocharged, and intercooled forced-induction framework to balance performance with fuel economy. By incorporating a high-pressure common rail fuel system and an advanced Electronic Control Unit (ECU), the DL06 achieves optimized combustion conditions, a stable power band, and lower emissions footprint compared to legacy mechanical designs. It is widely recognized for its robust construction, structural reliability, and serviceable layout under intense duty cycles.

The engine features a rigid, one-piece cast-iron cylinder block optimized for structural rigidity and thermal stability. Bore: 100 mm. Stroke: 125 mm. Total Displacement: 5890 cc (5.9 Liters). The DL06 operates with an overhead valve configuration driven via a traditional gear-driven camshaft train. Valve lash adjustment must be monitored periodically to prevent mechanical wear and maintain volumetric efficiency. The engine relies on a pressure-regulated, force-feed lubrication circuit powered by a gear-type oil pump. Oil passes through an integrated oil cooler and a full-flow cartridge filtration unit before reaching the main bearings and overhead assembly. Thermal regulation is managed by a closed, liquid-cooling system utilizing a centrifugal water pump to force coolant through the engine block, cylinder head, and oil cooler lines.

The DL06 utilizes an electronically controlled Common Rail System (CRS) featuring high-pressure fuel accumulation to facilitate precise direct injection. High-Pressure Pump: A Bosch CP3.3 high-pressure pump pressurizes the fuel rail. Injection Mechanics: The ECU dictates multi-hole injector firing timing and duration. Filtration: The fuel supply network consists of a primary pre-fuel filter with integrated water separation capabilities, followed by a secondary high-efficiency fine fuel filter cartridge to shield precision components from particulate damage.

General Technical Data

Engine Specifications

Engine Model ............... Doosan DL06
Engine Type ............... 4-cycle inline 6-cylinder direct injection water-cooled diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.94 (100.0)
Engine Stroke, in (mm) ............... 4.92 (125.0)
Displacement, cu.in (L) ............... 359 (5.89)
Rated Engine Power, hp (kW) ............... 100-175 (74-129) at 1850-2500 rpm
Rated Engine Speed, rpm ............... 1850-2500
Peak Torque ............... 451-765 Nm (333-564 lb-ft) at 1400 rpm
Low Idle Speed, rpm ............... 750-850
High Idle Speed, rpm ............... 2750-2850
Aspiration Type ............... Turbocharged and Intercooled
Operating Speed ............... 1800-2200 rpm
Compression Ratio ............... 17.4:1
Firing Order ............... 1-5-3-6-2-4
Valves Per Cylinder ............... 4 valves per cylinder
Combustion Chamber ............... Direct injection type spherical chamber
Engine Rotation Direction ............... Counter-clockwise viewed from flywheel side
Piston Type ............... Aluminum alloy with cooling gallery
Connecting Rod Type ............... Forged steel split design
Crankshaft Type ............... Forged steel with integrated counterweights
Camshaft Type ............... Forged steel gear-driven lower camshaft
Main Bearing Type ............... Tri-metal steel-backed inserts
Connecting Rod Bearing Type ............... Tri-metal steel-backed precision inserts
Cylinder Block Type ............... Cast iron with replaceable dry cylinder liner
Cylinder Head Type ............... Cast iron 4-valve per cylinder design
Lubrication System ............... Force-feed full-pressure circulation
Oil Pump Type ............... Gear-driven rotary pump
Oil Filter Type ............... Full-flow spin-on cartridge
Oil Cooler Type ............... Water-cooled plate type integrated matrix
Cooling System ............... Liquid forced circulation water pump
Water Pump Type ............... Belt-driven centrifugal pump
Thermostat Type ............... Wax pellet type dual valve thermostat
Air Cleaner Type ............... Dry dual-stage element with evacuator valve
Emission Certification ............... Euro 3 and Tier 3 compliant configurations
Starting System ............... Electric starter motor
Electrical System, V ............... 24
Alternator Output, A ............... 60 or 80

Fuel System

Fuel Injection Pump Type ............... Bosch CP3.3 high pressure common rail pump
Governor Type ............... Electronic control unit electronic governor
Fuel Control Type ............... Bosch common rail system
Maximum Injection Pressure, psi (bar) ............... 23206 (1600)
System Operating Pressure, psi (bar) ............... 3626-23206 (250-1600)
Common Rail Pressure Limiter Valve, psi (bar) ............... 28282 (1950)
Fuel Injector Type ............... Bosch CRIN electro-hydraulic solenoid multi-hole injector
Number of Injector Spray Holes ............... 6 or 8 precision micro orifices
Injector Opening Pressure, psi (bar) ............... 3626 (250)
Fuel Feed Pump Type ............... Mechanical gear type integrated pump
Primary Fuel Filter Type ............... Water separator spin-on element pre-filter
Secondary Fuel Filter Type ............... High efficiency spin-on element fine filter
Fuel Return Flow Rate, gpm (L/min) ............... 0.53-0.79 (2.0-3.0)
Electronic Control Unit Model ............... Bosch EDC7UC31 electronic control module
Injection Timing Control ............... Electronic maps variable pulse modulation based on load
Fuel Injection Mode ............... Multi-injection strategy with pilot main and post pulses
Fuel Transfer Pump Delivery Pressure, psi (bar) ............... 72.5-101.5 (5.0-7.0)
Fuel Grade Requirement ............... Ultra low sulfur diesel fuel standard specification
Fuel System Venting Type ............... Manual priming pump integrated on filter bracket
Fuel Temperature Sensor Type ............... Negative temperature coefficient thermistor
Rail Pressure Sensor Type ............... Piezo-resistive diaphragm pressure transducer element
Throttle Position Signal Type ............... Dual redundant analog potentiometer voltage output
Crankshaft Speed Sensor Type ............... Inductive electromagnetic pick-up sensor sensor unit
Camshaft Position Sensor Type ............... Hall effect phase synchronization sensor component
Fuel Pre-Heater Type ............... Electric 24V PTC element integrated within pre-filter
Water In Fuel Sensor Type ............... Two-pin electrical conductivity sensor base element
Fuel Leakage Monitor Type ............... Software calculated flow deviation diagnostics system

Dimensions and Weight

Overall Length, in (mm) ............... 44.9 (1140)
Overall Width, in (mm) ............... 29.2 (740)
Overall Height, in (mm) ............... 41.5 (1055)
Dry Weight, lbs (kg) ............... 1234 (560)
Wet Weight, lbs (kg) ............... 1289 (585)

Maintenance Data

Service Information

Compression Pressure (Standard), psi (bar) ............... 398 (27.5)
Compression Pressure (Limit), psi (bar) ............... 341 (23.5)
Oil Pressure at Low Idle, psi (bar) ............... 21.3 (1.47)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-78.2 (2.94-5.39)
Turbocharger Maximum Boost Pressure, psi (bar) ............... 21.7 (1.5)
Normal Operating Water Temperature, F (C) ............... 167-203 (75.0-95.0)
Normal Operating Oil Temperature, F (C) ............... 185-230 (85.0-110.0)
Thermostat Opening Temperature ............... 160 F (71 C)
Thermostat Full Open Temperature ............... 194 F (90 C)
Intake Valve Clearance (Cold), in (mm) ............... 0.0118 (0.3)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0157 (0.4)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-40, SAE 10W-30, or 15W-40
API Service Classifications ......................... CI-4 or CJ-4
Engine Oil Capacity, qt (L) ............... 20.1 (19.0)
Coolant Capacity (Engine Only), qt (L) ............... 11.6 (11.0)

Service Intervals

Change oil and filter ............... Every 500 hours
Inspect air cleaner ............... Every 250 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 1000 hours
Clean radiator core ............... Every 250 hours
Inspect belt tension ............... Every 250 hours

Service Specifications

Cylinder Liner Inner Diameter, in (mm) ............... 3.9370-3.9378 (100.000-100.022)
Cylinder Liner Wall Thickness, in (mm) ............... 0.16 (4.0)
Main Journal Outer Diameter, in (mm) ............... 3.1492-3.1500 (79.988-80.010)
Crankpin Journal Outer Diameter, in (mm) ............... 2.5587-2.5594 (64.992-65.011)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0016-0.0035 (0.040-0.090)
Connecting Rod Center to Center, in (mm) ............... 7.48 (190.0)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Crankshaft End Play, in (mm) ............... 0.0059-0.0126 (0.150-0.320)
Connecting Rod Side Play, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 3.9327-3.9335 (99.890-99.910)
Piston to Cylinder Liner Clearance, in (mm) ............... 0.0035-0.0052 (0.090-0.132)
Piston Overall Length, in (mm) ............... 3.54 (90.0)
Piston Pin Outer Diameter, in (mm) ............... 1.42 (36.0)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0006-0.0013 (0.015-0.033)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0002-0.0005 (0.005-0.013)
Second Ring Groove Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Second Ring End Gap, in (mm) ............... 0.0138-0.0217 (0.350-0.550)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0197 (0.250-0.500)
Cylinder Head Flatness Distortion, in (mm) ............... 0.0020 (0.05)
Cylinder Head Distortion Long Span Max, in (mm) ............... 0.0040 (0.1)
Intake Valve Stem Diameter, in (mm) ............... 0.27 (7.0)
Exhaust Valve Stem Diameter, in (mm) ............... 0.27 (7.0)
Valve Guide Inner Diameter, in (mm) ............... 0.2756-0.2764 (7.000-7.022)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0021 (0.025-0.054)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0014-0.0025 (0.035-0.064)
Valve Spring Free Lenght, in (mm) ............... 2.028 (51.5)
Valve Seat Sink Depth, in (mm) ............... 0.0354-0.0472 (0.900-1.200)
Camshaft Journal Outer Diameter, in (mm) ............... 2.1240-2.1248 (53.950-53.970)
Camshaft Bearing Inside Diameter, in (mm) ............... 2.1268-2.1283 (54.020-54.060)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0020-0.0043 (0.050-0.110)
Camshaft End Play, in (mm) ............... 0.0051-0.0102 (0.130-0.260)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.8665-0.8673 (22.010-22.030)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.8646-0.8654 (21.960-21.980)

Tightening Torques

Cylinder Head Bolt (1-Step) ............... 43.4 lb-ft (58.8 Nm)
Cylinder Head Bolt (1-Step) ............... 72.3 lb-ft (98.1 Nm) + 180 deg rotation
Main Bearing Cap Bolt ............... 115.1 lb-ft (157.5 Nm)
Connecting Rod Cap Bolt ............... 70.5 lb-ft (95.6 Nm)
Flywheel Retaining Mount Bolt ............... 130.2 lb-ft (176.5 Nm)
Flywheel Housing Core Bolt ............... 81.0 lb-ft (109.8 Nm)
Crankshaft Pulley Center Hub Bolt ............... 144.7 lb-ft (196.1 Nm)
Vibration Damper Face Core Bolt ............... 44.8 lb-ft (60.8 Nm)
Camshaft Thrust Plate Core Bolt ............... 23.9 lb-ft (32.4 Nm)
Camshaft Gear Center Main Stub Bolt ............... 65.1 lb-ft (88.3 Nm)
Idler Gear Assembly Hub Mounting Bolt ............... 47.0 lb-ft (63.7 Nm)
Oil Spray Cooling Jet Nozzle Core Plug ............... 7.2 lb-ft (9.8 Nm)
Oil Pan Perimeter Flange Fastener ............... 15.9 lb-ft (21.6 Nm)
Oil Pan Main Low Base Sump Drain Plug ............... 57.9 lb-ft (78.5 Nm)
Cylinder Head Valve Rocker Shaft Support Bolt ............... 32.5 lb-ft (44.1 Nm)
Valve Clearance Adjusting Jam Locking Nut ............... 15.9 lb-ft (21.6 Nm)
Cylinder Head Top Rocker Cover Sealing Nut ............... 8.7 lb-ft (11.8 Nm)
Intake Manifold Header Port Fastener ............... 15.9 lb-ft (21.6 Nm)
Exhaust Manifold Heat Shield Fastener ............... 32.5 lb-ft (44.1 Nm)
Turbocharger Mounting Flange Exhaust Nut ............... 32.5 lb-ft (44.1 Nm)
Turbocharger Oil Feed Line Supply Connector ............... 20.3 lb-ft (27.5 Nm)
Turbocharger Oil Drain Tube Flange Bolt ............... 15.9 lb-ft (21.6 Nm)
Water Pump Assembly Block Mounting Bolt ............... 15.9 lb-ft (21.6 Nm)
Cooling Fan Hub Flange Pulley Drive Bolt ............... 15.9 lb-ft (21.6 Nm)
Thermostat Housing Cover Core Bolt ............... 15.9 lb-ft (21.6 Nm)
Oil Cooler Matrix Housing Core Backer Bolt ............... 15.9 lb-ft (21.6 Nm)
Oil Pump Inner Assembly Core Frame Bolt ............... 20.3 lb-ft (27.5 Nm)
Common Rail High Pressure Supply Gland ............... 21.7 lb-ft (29.4 Nm)
Bosch CP3.3 High Pressure Pump Flange Nut ............... 23.9 lb-ft (32.4 Nm)
Fuel Injector Hold Down Clamp Bolt ............... 23.9 lb-ft (32.4 Nm)
Electronic Common Rail Assembly Body Bolt ............... 15.9 lb-ft (21.6 Nm)
Electronic Control Unit Frame Bracket Bolt ............... 7.2 lb-ft (9.8 Nm)
Crankshaft Speed Position Sensor Bolt ............... 5.8 lb-ft (7.8 Nm)
Camshaft Timing Synchronization Sensor Bolt ............... 5.8 lb-ft (7.8 Nm)
Coolant Temperature NTC Sensor Plug ............... 21.7 lb-ft (29.4 Nm)
Common Rail Main Fuel Line Pressure Sensor ............... 25.3 lb-ft (34.3 Nm)
Intake Air Grid Pre-Heater Main Element Bolt ............... 15.9 lb-ft (21.6 Nm)
Starter Motor Shell Flange Mount Bolt ............... 57.9 lb-ft (78.5 Nm)
Alternator Pivot Mount Long Support Bolt ............... 32.5 lb-ft (44.1 Nm)
Air Compressor Drive Input Gear Nut ............... 57.9 lb-ft (78.5 Nm)
Engine Front Support Bracket Frame Bolt ............... 81.0 lb-ft (109.8 Nm)
Engine Rear Support Flywheel Bracket Bolt ............... 81.0 lb-ft (109.8 Nm)
EGR Cooler Shell Mounting Bolt ............... 15.9 lb-ft (21.6 Nm)
EGR Valve Control Body Bolt ............... 15.9 lb-ft (21.6 Nm)
Crankcase Breather Separator Evacuator Bolt ............... 7.2 lb-ft (9.8 Nm)

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• Doosan Engines Specs
  
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• Doosan D34P Specs
  
• Doosan DL06K Specs
  
• Doosan DL08 Specs
  
• Doosan DL08K Specs
  

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