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Doosan DL08K Engine

The Doosan DL08K is an inline, 6-cylinder, 4-stroke, water-cooled diesel engine designed to meet stringent emissions regulations (such as Tier 4 Interim / Stage IIIB and Euro V). Engineered for heavy-duty industrial vehicles and construction machinery, it utilizes an electronic control unit (ECU) combined with an Exhaust Gas Recirculation (EGR) system, Diesel Particulate Filter (DPF), or Selective Catalytic Reduction (SCR) depending on the specific application package. The design integrates replaceable dry cylinder liners and a Variable Turbine Geometry (VTG) turbocharger with an air-to-air intercooler to optimize thermal efficiency and low-end torque performance.

Valve Configuration: Overhead Valve (OHV) arrangement. Valves per Cylinder: 4 valves (2 intake valves, 2 exhaust valves). Bore: 108 mm. Stroke: 139 mm. Total Displacement: 7640 cc (7.6 Liters). Cooling System: Forced water circulation via an engine-driven water pump. System Characteristics: Employs a pressurized radiator loop utilizing a mix of 33% to 50% ethylene glycol antifreeze mixed with anti-corrosion inhibitors to protect against cavitation and premature parts wear due to overcooling or overheating.

Fuel System: High-pressure Electronic Common Rail system. High-Pressure Pump: Bosch CP3.3 supply pump. Feed Pump: Mechanical gear-type fuel delivery pump. Injection Nozzles: Multi-hole type electro-hydraulic injectors managed directly by the engine ECU. Filtration: Full-flow, replaceable cartridge-type fuel filtration setup. Lubrication System: Fully forced pressure feed type driven by a gear-type oil pump. Piston Cooling: Integrated oil gallery piston cooling setup via under-piston oil jets. Oil Specification: ACEA-E5 or API CI-4 (typical viscosity 10W-40).

General Technical Data

Engine Specifications

Engine Model ............... Doosan DL08K
Engine Type ............... 4-cycle inline 6-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.25 (108.0)
Engine Stroke, in (mm) ............... 5.47 (139.0)
Displacement, cu.in (L) ............... 466 (7.64)
Rated Power, hp (kW) ............... 270-340 (202-250)
Rated Speed, rpm ............... 1800-2200
Peak Torque ............... 981-1423 Nm (723-1050 lb-ft) at 1200 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Turbocharged and Intercooled
Operating Speed ............... 1800-2200 rpm
Compression Ratio ............... 16.5:1-17.4:1
Firing Order ............... 1-5-3-6-2-4
Rotation Direction ............... Counter-clockwise viewed from flywheel side
Combustion System ............... Direct injection common rail
Cylinder Liner Type ............... Replaceable dry liner
Valve System Type ............... Overhead Valve configuration
Number of Valves per Cylinder ............... 4 valves (2 intake, 2 exhaust)
Crankcase Ventilation ............... Closed circuit breather installation
Piston Cooling Method ............... Oil gallery forced jet cooling
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Fully forced pressure feed type
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled water circulation
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage element
Aftertreatment System ............... Selective Catalytic Reduction system
Emissions Certification ............... Tier 4 Interim / Euro V compliant
Starting System ............... Electric Starter motor
Electrical System ............... 24V
Starting Motor Power, hp (kW) ............... 8.04 (6.0)
Battery Voltage ............... 24V

Fuel System

Fuel Injection Pump Model ............... Bosch CP3.3 high pressure pump
Injection Pump Feed Pump Type ............... Mechanical gear type pump
Common Rail Max Operating Pressure, psi (bar) ............... 26106 (1800)
Common Rail Valve Opening Pressure, psi (bar) ............... 25381 (1750)
Rail Pressure Sensor Model ............... Bosch RDS3 electronic sensor
Fuel Metering Unit Resistance, ohms ............... 2.6-3.5 at 68 F (20 C)
Fuel Metering Unit Operating Threshold ............... Open below 8V, closed above 8V
Fuel Injector Type ............... Electronic multi-hole electro-magnetic nozzle
Fuel Injector Solenoid Resistance, ohms ............... 0.31-0.42 at 68 F (20 C)
Fuel Injection Strategy ............... 1 pilot injection and 1 main injection event
Fuel Filter Type ............... Full flow cartridge element design
Recommended Fuel Grade ............... Ultra-low sulfur diesel fuel oil
Low Pressure Fuel Supply Lines Pressure, psi (bar) ............... 72.5-101.5 (5.0-7.0)
Fuel Return Line Maximum Backpressure, psi (bar) ............... 14.5 (1.0)
Governor Type ............... Electronic Control Unit integrated
Governor Control System ............... Electronic Control Unit EDC7UC31
Limp Home Mode Operating Pressure, psi (bar) ............... 5801-7251 (400-500)
Emergency Shutoff Strategy ............... Electronic solenoid fuel cut-off mechanism
Fuel Injection Timing Control ............... Variable mapped mapping electronic adjust
Water Separator Assembly ............... Integrated primary water trap filter bowl

Dimensions and Weight

Overall Length, in (mm) ............... 51.3 (1305)
Overall Width, in (mm) ............... 35.7 (905)
Overall Height, in (mm) ............... 46.5 (1180)
Dry Weight, lbs (kg) ............... 1844 (836)
Operating Weight, lbs (kg) ............... 1930 (875)

Maintenance Data

Service Information

Oil Pressure at Idle Speed, bar (psi) ............... 1.0-1.5 (14.5-21.7)
Oil Pressure at Rated Speed, bar (psi) ............... 3.0-5.5 (43.5-79.7)
Oil Relief Valve Opening Pressure, bar (psi) ............... 6.0-6.5 (87.0-94.2)
Oil Thermostat Opening Temperature, C (F) ............... 92 (197.6)
Thermostat Initial Opening Temperature, C (F) ............... 79-83 (174.2-181.4)
Thermostat Full Open Temperature, C (F) ............... 95 (203.0)
Intake Valve Clearance Cold, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance Cold, in (mm) ............... 0.016 (0.40)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-40, SAE 10W-30, or 15W-40
API Service Classifications ......................... CI-4, CJ-4, or CK-4
Engine Oil Capacity, Max Level, qt (L) ............... 29.5 (28.0)
Engine Oil Capacity Min Level, qt (L) ............... 22.2 (21.0)
Cooling Capacity, Engine Only, qt (L) ............... 14.8 (14.0)
Cooling Capacity with Radiator, qt (L) ............... 38.0-44.4 (36.0-42.0)

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 Bore Inside Diameter, in (mm) ............... 4.2519-4.2527 (108.000-108.022)
Cylinder Bore Roundness Limit, in (mm) ............... 0.0006 (0.015)
Cylinder Liner Projection Above Block, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Crankshaft Main Journal Diameter, in (mm) ............... 3.3838-3.3846 (85.950-85.972)
Main Bearing Oil Clearance, in (mm) ............... 0.0020-0.0048 (0.052-0.122)
Crankpin Journal Diameter, in (mm) ............... 2.7145-2.7153 (68.950-68.972)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0013-0.0038 (0.034-0.098)
Crankshaft End Play, in (mm) ............... 0.0055-0.0122 (0.140-0.310)
Connecting Rod Side Clearance, in (mm) ............... 0.0063-0.0126 (0.160-0.320)
Piston Skirt Outer Diameter, in (mm) ............... 4.2484-4.2492 (107.910-107.930)
Piston to Cylinder Liner Clearance, in (mm) ............... 0.0027-0.0044 (0.070-0.112)
Piston Pin Standard Diameter, in (mm) ............... 1.5746-1.5749 (39.994-40.000)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0009-0.0018 (0.024-0.045)
Top Ring Groove Clearance, in (mm) ............... Keystone type profile keystone
Second Ring Groove Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Oil Ring Groove Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Top Ring End Gap, in (mm) ............... 0.0118-0.0177 (0.300-0.450)
Second Ring End Gap, in (mm) ............... 0.0196-0.0295 (0.500-0.750)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0196 (0.250-0.500)
Cylinder Head Surface Distortion, Limit, in (mm) ............... 0.0078 (0.200)
Cylinder Block Surface Distortion, Limit, in (mm) ............... 0.0078 (0.200)
Intake Valve Stem Diameter, in (mm) ............... 0.3129-0.3137 (7.950-7.970)
Exhaust Valve Stem Diameter, in (mm) ............... 0.3118-0.3126 (7.920-7.940)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.100)
Intake Valve Seat Angle, degrees ............... 30
Exhaust Valve Seat Angle, degrees ............... 45
Valve Spring Free Length, in (mm) ............... 2.440 (62.0)
Camshaft Journal Diameter, in (mm) ............... 2.1629-2.1637 (54.940-54.960)
Camshaft End Play, in (mm) ............... 0.0051-0.0118 (0.130-0.300)
Idler Gear Bushing to Shaft Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)

Tightening Torques

Cylinder Head Fastener (Step 1) ............... 40 Nm (29.5 lb-ft)
Cylinder Head Fastener (Step 2) ............... 60 Nm (44.2 lb-ft) plus 180 deg rotation
Main Bearing Cap Fasteners (Step 1) ............... 150 Nm (110.6 lb-ft)
Main Bearing Cap Fasteners (Step 2) ............... 295-300 Nm (217.5-221.2 lb-ft)
Connecting Rod Cap Fasteners (Step 1) ............... 80 Nm (59.0 lb-ft)
Connecting Rod Cap Fasteners (Step 2) ............... 177-180 Nm (130.5-132.7 lb-ft)
Flywheel Mounting Fasteners ............... 255-260 Nm (188.1-191.7 lb-ft)
Crankshaft Damper Pulley Fasteners ............... 230-250 Nm (169.6-184.3 lb-ft)
Camshaft Gear Mounting Fasteners ............... 90-110 Nm (66.3-81.1 lb-ft)
Camshaft Thrust Plate Fasteners ............... 25-35 Nm (18.4-25.8 lb-ft)
Rocker Arm Shaft Bracket Fasteners ............... 45-55 Nm (33.1-40.5 lb-ft)
Cylinder Head Cover Fasteners ............... 10-15 Nm (7.3-11.0 lb-ft)
Oil Pan Drain Plug Fastener ............... 60-70 Nm (44.2-51.6 lb-ft)
Oil Pan Mounting Fasteners ............... 20-28 Nm (14.7-20.6 lb-ft)
Fuel High Pressure Common Rail Fasteners ............... 25-35 Nm (18.4-25.8 lb-ft)
Fuel High Pressure Line Nuts ............... 25-30 Nm (18.4-22.1 lb-ft)
Fuel Injector Clamp Fasteners ............... 28-32 Nm (20.6-23.6 lb-ft)
Exhaust Manifold Mounting Fasteners ............... 45-55 Nm (33.1-40.5 lb-ft)
Intake Manifold Mounting Fasteners ............... 28-35 Nm (20.6-25.8 lb-ft)
Turbocharger Mounting Fasteners ............... 45-55 Nm (33.1-40.5 lb-ft)
Water Pump Mounting Fasteners ............... 20-28 Nm (14.7-20.6 lb-ft)
Thermostat Housing Fasteners ............... 20-28 Nm (14.7-20.6 lb-ft)
Oil Pump Mounting Fasteners ............... 25-35 Nm (18.4-25.8 lb-ft)
Oil Cooler Housing Fasteners ............... 22-30 Nm (16.2-22.1 lb-ft)
Front Gear Housing Fasteners (M8) ............... 22-30 Nm (16.2-22.1 lb-ft)
Front Gear Housing Fasteners (M10) ............... 45-55 Nm (33.1-40.5 lb-ft)
Flywheel Housing Fasteners (M10) ............... 45-55 Nm (33.1-40.5 lb-ft)
Flywheel Housing Fasteners (M12) ............... 75-85 Nm (55.3-62.6 lb-ft)
Starter Motor Mounting Fasteners ............... 75-85 Nm (55.3-62.6 lb-ft)
Alternator Mounting Bracket Fasteners ............... 45-55 Nm (33.1-40.5 lb-ft)
Air Compressor Mounting Fasteners ............... 45-55 Nm (33.1-40.5 lb-ft)
Engine Mounting Bracket Fasteners ............... 180-210 Nm (132.7-154.8 lb-ft)
Fan Clutch Hub Mounting Fasteners ............... 35-45 Nm (25.8-33.1 lb-ft)
Oil Pressure Sensor ............... 15-22 Nm (11.0-16.2 lb-ft)
Coolant Temperature Sensor ............... 20-28 Nm (14.7-20.6 lb-ft)
Crankshaft Position Sensor Fastener ............... 8-12 Nm (5.9-8.8 lb-ft)
Camshaft Position Sensor Fastener ............... 8-12 Nm (5.9-8.8 lb-ft)

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• Doosan Engines Specs
  
• Doosan D34 Specs
  
• Doosan D34P Specs
  
• Doosan DL06 Specs
  
• Doosan DL06K Specs
  
• Doosan DL08 Specs
  

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