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Doosan DL06K Engine

The Doosan DL06K is a 5.9-liter, 6-cylinder, in-line, 4-stroke diesel engine designed for heavy-duty industrial, agricultural, and construction equipment. It incorporates a turbocharger and air-to-air intercooler system to optimize thermal efficiency and load response. Built to meet strict environmental standards, the DL06K platform integrates Exhaust Gas Recirculation (EGR) coupled with a Diesel Particulate Filter (DPF) to achieve Euro V and Tier 4 Interim compliance. Heavy structural elements such as replaceable dry cylinder liners and a gear-driven timing assembly emphasize a design balanced around durability and simplified serviceability.

The cylinder head layout features an Overhead Valve (OHV) train structure. It utilizes a 4-valve per cylinder configuration, consisting of 2 intake valves and 2 exhaust valves to maximize gas exchange efficiency. Cylinder Bore: 100 mm. Piston Stroke: 125 mm. Total Displacement: 5,890 cc (5.9 Liters). Engine lubrication relies on a forced feed circulation system driven by a gear-type oil pump. The oiling circuit incorporates full-flow cartridge filters and a dedicated water-cooled oil cooler integrated into the block jacket to maintain oil viscosity stability under heavy operational loads. The system is optimized for SAE 15W-40 engine oil.

Fuel delivery is managed via an Electronic Common Rail Direct Injection System. High-pressure fuel generation is handled by a Bosch injection pump capable of operating at system pressures reaching up to 1,800 bar. This system uses a dedicated Electronic Control Unit (ECU) to command individual electronic fuel injectors, optimizing injection timing and fuel volume based on live data from the Commonrail Pressure Sensor (RPS) and Fuel Metering Unit (FMU). The primary fuel circuit incorporates a primary water-separating filter element to protect high-pressure components from moisture contamination. For exhaust aftertreatment management, an external Hydrocarbon (HC) dosing system containing an independent metering and injection unit is installed directly on the exhaust tract upstream of the Diesel Oxidation Catalyst (DOC) to periodically initiate active DPF regeneration cycles.

The thermal management circuit utilizes a forced-circulation liquid cooling loop driven by a high-capacity belt-driven centrifugal water pump. Temperature regulation is governed by a wax-pellet type thermostat that restricts or allows flow to the external radiator network depending on operational load. An electronically controlled fan clutch sensor manages variable cooling fan speed dynamically based on readings from the dedicated cooling water temperature sensor.

General Technical Data

Engine Specifications

Engine Model ............... Doosan DL06K
Engine Architecture ............... 4-cycle inline 6-cylinder direct injectio diesel
Number of Cylinders ............... 6
Cylinder Configuration ............... Vertical in-line
Cylinder Bore, in (mm) ............... 3.937 (100.0)
Cylinder Stroke, in (mm) ............... 4.921 (125.0)
Total Displacement, cu.in (L) ............... 359.4 (5.890)
Maximum Power Output, hp (kW) ............... 136-280 (100-206)
Rated Engine Speed, rpm ............... 1850-2500
Maximum Gross Power, hp (kW) ............... 280 (206) at 2500 rpm
Minimum Power Rating, hp (kW) ............... 136 (100) at 1850 rpm
Peak Torque Output, lb-ft (Nm) ............... 723 (980) at 1400 rpm
Minimum Peak Torque, lb-ft (Nm) ............... 322 (436) at 1400 rpm
Engine Low Idle Speed, rpm ............... 750-800
Engine High Idle Speed, rpm ............... 1950-2500
Minimum Full Load Speed, rpm ............... 1400
Compression Ratio ............... 17.4:1
Firing Order ............... 1-5-3-6-2-4
Aspiration Type ............... Turbocharged and air-to-air intercooled
Engine Rotation Direction ............... Counter-clockwise viewed from flywheel side
Combustion System ............... Direct injection common rail
Cylinder Liner Variant ............... Replaceable dry liner type
Timing Drive System ............... Rear-mounted gear driven system
Number of Valves per Cylinder ............... 4 (2 intake, 2 exhaust)
Total Number of Valves ............... 24
Cylinder Block Material ............... High-strength cast iron alloy
Cylinder Head Material ............... Monoblock cast iron alloy
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
Engine Management ............... Full electronic control unit module
Emissions Certification ............... EPA Tier 4 Interim, Stage IIIB, Euro 5 compliant
Exhaust Aftertreatment System ............... EGR with DPF and selective catalytic reduction
Starting System ............... Electric starter motor
Electrical System, V ............... 24
Alternator Output, A ............... 60 or 80

Fuel System

Fuel Injection Pump Model ............... Bosch CP3.3 high pressure pump
Injection Pump Drive Type ............... Gear driven from timing gear train
Fuel Feed Pump Type ............... Mechanical gear type integrated pump
Fuel Rail Layout ............... Single high pressure common rail forge
Fuel Injector Assembly ............... Solenoid controlled multi-hole electronic injectors
Number of Injector Spray Holes ............... 8
Fuel Injection Electronic Control Unit ............... Bosch EDC17 system module
Primary Fuel Filter Rating, microns ............... 10
Secondary Fuel Filter Rating, microns ............... 2
Water Separator Device Type ............... Cartridge filter with integrated water level sensor
Nominal Common Rail Pressure, psi (bar) ............... 3625-23206 (250-1600)
Maximum Design Rail Pressure, psi (bar) ............... 23206 (1600)
Fuel Injection Pressure at Idle, psi (bar) ............... 3625 (250)
Fuel Injection Pressure at Max Torque, psi (bar) ............... 20305 (1400)
Fuel Injection Pressure at Rated Power, psi (bar) ............... 23206 (1600)
Maximum Fuel Return Flow Backpressure, psi (bar) ............... 8.7 (0.6)
Fuel Transfer Pump Delivery Pressure, psi (bar) ............... 72.5-101.5 (5.0-7.0)
Fuel Return Line Flow Rate, gph (L/h) ............... 42.2 (160.0)
High Pressure Fuel Line Material ............... Double-wall high strength steel tubing
Fuel Injection Control Mechanism ............... Pulse width modulation electronic transmission

Dimensions and Weight

Overall Length, in (mm) ............... 43.1 (1095)
Overall Width, in (mm) ............... 33.3 (845)
Overall Height, in (mm) ............... 37.3 (950)
Dry Weight, lbs (kg) ............... 1235 (560)
Wet Weight, lbs (kg) ............... 1336 (606)

Maintenance Data

Service Information

Oil Pressure at Low Idle, psi (bar) ............... 21.3-42.6 (1.5-3.0)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-78.2 (3.0-5.5)
Relief Valve Opening Pressure, psi (bar) ............... 85.3 (5.9)
Cooling Circuit Pressure Cap Rating, psi (bar) ............... 7.1-12.8 (0.49-0.88)
Turbocharger Boost Pressure, psi (bar) ............... 18.8-24.6 (1.3-1.7)
Normal Operating Oil Temperature, F (C) ............... 194.0-230.0 (90.0-110.0)
Thermostat Start-to-Open Temperature, F (C) ............... 159.8 (71.0)
Thermostat Fully Open Temperature, F (C) ............... 203.0 (95.0)
Alternator Belt Deflection Under 10kg Force, in (mm) ............... 0.393-0.590 (10.0-15.0)
Air Conditioner Compressor Belt Deflection, in (mm) ............... 0.314-0.472 (8.0-12.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0118 (0.30)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0157 (0.40)

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 (Max Level), qt (L) ............... 20.0 (19.0)
Engine Oil Capacity (Min Level), qt (L) ............... 14.8 (14.0)
Engine Oil Capacity (Total), qt (L) ............... 22.1 (21.0)
Coolant Capacity (Engine Block), qt (L) ............... 13.7 (13.0)
Cooling Capacity with Radiator, qt (L) ............... 31.7 (30.0)

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
  
• Doosan D34 Specs
  
• Doosan D34P Specs
  
• Doosan DL06 Specs
  
• Doosan DL08 Specs
  
• Doosan DL08K Specs
  

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