________________________________________________________________________________

Doosan DM02P Engine

The Doosan DM02P (also referred to as the Bobcat D24) is a heavy-duty, inline 4-cylinder, 4-cycle diesel engine engineered specifically for compact industrial machinery, agricultural equipment, and construction vehicles. Designed to fulfill Tier 4 Final and EU Stage V emissions standards, it utilizes a highly reliable architecture combined with advanced electronic controls. It is widely deployed across a diverse variety of medium-sized equipment (including tracked loaders, skid steers, forklifts, and compact excavators) where a compact footprint must deliver high low-end torque, operational longevity, and superior fuel economy.

The overhead system uses a standard pushrod-and-tappet actuation mechanism driven by a single gear-driven camshaft. The assembly features dual valves per cylinder (one intake, one exhaust) acting directly through standard rocker arms. Clearance adjustments must be performed mechanically at the rocker arm set screws. The physical displacement measures 2.4 liters. The internal dimensions feature a bore diameter of 90 mm and a piston stroke length of 94 mm, operating with a standard compression ratio of 17.0:1.

Fuel System: The fuel architecture relies on an advanced high-pressure Bosch Common-Rail system. High-pressure fuel delivery is initiated by a dedicated Bosch common-rail injection pump feeding a pressurized fuel rail. Fuel distribution is completed via electronically controlled multi-hole injectors executing precise multi-stage injection events per cycle. Overall system fuel metering, timing advance, and rail pressure curves are dynamic and continuously adapted by the central engine Electronic Control Unit (ECU).

Engine lubrication is provided via a forced-circulation pressure system driven by a high-efficiency internal oil pump. Main system features include a full-flow, spin-on cartridge oil filter, dedicated internal piston cooling oil spray nozzles mounted within the crankcase block, and an integrated internal oil cooler to stabilize viscosity under heavy thermal cycles. The unit employs a closed-loop, fresh-water forced circulation liquid cooling system. Coolant movement is managed by a belt-driven centrifugal water pump. System temperatureregulation is precisely controlled via a mechanical inline thermostat.

General Technical Data

Engine Specifications

Engine Model ............... Doosan DM02P
Engine Type ............... 4-cycle inline 4-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.54 (90.0)
Engine Stroke, in (mm) ............... 3.70 (94.0)
Displacement, cu.in (L) ............... 146 (2.392)
Rated Engine Power, hp (kW) ............... 49-75 (36.6-55.4)
Rated Engine Speed, rpm ............... 2300-2600
Peak Torque ............... 320 Nm (236 lb-ft) at 1600 rpm
Idle Speed ............... 800-950 rpm
Aspiration Type ............... Turbocharged and air-to-air aftercooled
Operating Speed ............... 2600 rpm
Compression Ratio ............... 17.0:1
Firing Order ............... 1-3-4-2
Rotation Direction ............... Counter-clockwise viewed from flywheel
Combustion System ............... Direct injection common rail system
Valves per Cylinder ............... 2 intake, 2 exhaust
Camshaft Drive ............... Gear train driven system
Crankcase Ventilation ............... Closed crankcase ventilation system
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure feed
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled with forced circulation
Water Pump Type ............... Centrifugal, belt-driven
Air Cleaner Type ............... Dry dual-element
Exhaust Gas Recirculation ............... Cooled EGR system
Aftertreatment System ............... DOC and Diesel Particulate Filter
Emissions Certification ............... EPA Tier 4 Final / EU Stage V
Starting System ............... Electric Starter motor
Electrical System ............... 12V

Fuel System

Fuel Injection System ............... High pressure common rail electronic delivery
Common Rail Maximum Pressure, psi (bar) ............... 26100 (1800)
Common Rail Minimum Pressure, psi (bar) ............... 3625 (250)
Fuel Injection Pump Model ............... Bosch high pressure CP4.1 variant
Fuel Injection Pump Drive Type ............... Gear driven via engine gear train
Fuel Injector Configuration ............... Solenoid controlled multi-hole vertical placement
Number of Injector Spray Holes ............... 8 micro-orifices per nozzle tip
Fuel Feed Pump Supply Pressure, psi (bar) ............... 58.0-87.0 (4.0-6.0)
Governor Control Type ............... Electronic Control Unit managed governor system
Recommended Fuel ............... Ultra Low Sulfur Diesel EN 590 or ASTM D975
Maximum Fuel Inlet Temperature, F (C) ............... 122 (50)
High Pressure Fuel Piping Wall Thickness, in (mm) ............... 0.078 (2.0)
High Pressure Fuel Piping Outer Diameter, in (mm) ............... 0.236 (6.0)

Dimensions and Weight

Overall Length, in (mm) ............... 29.2 (74)
Overall Width, in (mm) ............... 22.6 (575)
Overall Height, in (mm) ............... 27.79 (705)
Dry Weight, lbs (kg) ............... 514 (233)
Wet Weight, lbs (kg) ............... 547 (248)

Maintenance Data

Service Information

Compression Pressure, Minimum Limit, psi (bar) ............... 348 (24.0)
Oil Pressure at Idle Speed, psi (bar) ............... 14.5 (1.0)
Oil Pressure at Rated Speed, psi (bar) ............... 43.5-65.2 (3.0-4.5)
Coolant Temperature Operating Range, F (C) ............... 176-203 (80-95)
Oil Temperature Operating Range, F (C) ............... 194-230 (90-110)
Thermostat Opening Temperature, F (C) ............... 180 (82)
Thermostat Full Open Temperature, F (C) ............... 203 (95)
Intake Valve Clearance, in (mm) ............... 0.0118 (0.300)
Exhaust Valve Clearance, in (mm) ............... 0.0157 (0.400)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-40, SAE 10W-30, or 15W-40
API Service Classifications ......................... CJ-4 or CK-4
Engine Oil Capacity (Maximum Level), qt (L) ............... 9.0 (8.5)
Engine Oil Capacity (Minimum Level), qt (L) ............... 6.8 (6.4)
Total System Capacity With Filter, qt (L) ............... 10.0 (9.5)
Cooling System Capacity, gal (L) ............... 1.45 (5.5)
Cooling Capacity with Radiator, gal (L) ............... 2.90 (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 1500 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 Inner Diameter, in (mm) ............... 3.5433-3.5441 (90.000-90.022)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.5472 (90.100)
Cylinder Bore Out of Roundness, in (mm) ............... 0.0005 (0.015)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0019 (0.050)
Cylinder Head Bottom Surface Distortion Flatness, in (mm) ............... 0.0019 (0.050)
Crankshaft Axial End Play, in (mm) ............... 0.0039-0.0098 (0.10-0.25)
Main Bearing Bore Inside Diameter, in (mm) ............... 2.9527-2.9535 (75.000-75.020)
Crankshaft Main Journal Diameter, in (mm) ............... 2.7551-2.7559 (69.980-70.000)
Crankpin Journal Diameter, in (mm) ............... 2.1645-2.1653 (54.980-55.000)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0015-0.0033 (0.040-0.085)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1818-1.1824 (30.020-30.035)
Connecting Rod Big End Bore I.D, in (mm) ............... 2.2834-2.2842 (58.000-58.020)
Connecting Rod Side Play, in (mm) ............... 0.0039-0.0098 (0.100-0.250)
Piston Skirt Outer Diameter, in (mm) ............... 3.5401-3.5409 (89.920-89.940)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.102)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1812-1.1816 (30.003-30.012)
Piston Pin Outside Diameter, in (mm) ............... 1.1807-1.1811 (29.991-30.000)
Piston Pin to Piston Bushing Clearance, in (mm) ............... 0.0001-0.0008 (0.003-0.021)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
Oil Ring Groove Width, in (mm) ............... 0.1189-0.1197 (3.020-3.040)
Top Ring Side Clearance, in (mm) ............... 0.0023-0.0037 (0.060-0.095)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0029 (0.040-0.075)
Oil Ring Side Clearance, in (mm) ............... 0.0009-0.0025 (0.025-0.065)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0137-0.0216 (0.350-0.550)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0196 (0.250-0.500)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2740-0.2748 (6.960-6.980)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2732-0.2740 (6.940-6.960)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.020)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.020)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0007-0.0023 (0.020-0.060)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Intake Valve Seat Width, in (mm) ............... 0.0472-0.0590 (1.200-1.500)
Exhaust Valve Seat Width, in (mm) ............... 0.0551-0.0669 (1.400-1.700)
Intake Valve Sink Depth, in (mm) ............... 0.0275-0.0393 (0.700-1.000)
Exhaust Valve Sink Depth, in (mm) ............... 0.0275-0.0393 (0.700-1.000)
Valve Spring Free Length Standard, in (mm) ............... 1.8897 (48.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.9673-1.9681 (49.970-49.990)
Camshaft Journal Outer Diameter (Middle), in (mm) ............... 1.9476-1.9484 (49.470-49.490)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.9279-1.9287 (48.970-48.990)
Camshaft Bushing Inner Diameter (Front), in (mm) ............... 1.9696-1.9708 (50.030-50.060)
Camshaft Bushing Inner Diameter (Middle), in (mm) ............... 1.9500-1.9511 (49.530-49.560)
Camshaft Bushing Inner Diameter (Rear), in (mm) ............... 1.9303-1.9314 (49.030-49.060)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Intake Cam Lobe Height, in (mm) ............... 1.5551-1.5590 (39.500-39.600)
Exhaust Cam Lobe Height, in (mm) ............... 1.5748-1.5787 (40.000-40.100)
Camshaft Axial End Play, in (mm) ............... 0.0027-0.0078 (0.07-0.20)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.7862-0.7870 (19.970-19.990)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.7874-0.7885 (20.000-20.030)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0003-0.0023 (0.010-0.060)
Crankshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Idler Gear to Camshaft Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)
Idler Gear to Fuel Injection Pump Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.070-0.150)

Tightening Torques

Cylinder Head Bolts (1-Stage), lb-ft (Nm) ............... 33.1 (45.0)
Cylinder Head Bolts (2-Stage), lb-ft (Nm) ............... 66.3 (90.0)
Cylinder Head Bolts (3-Stage), lb-ft (Nm) ............... 88.5 (120.0)
Main Bearing Cap Bolts (1-Stage), lb-ft (Nm) ............... 36.8 (50.0)
Main Bearing Cap Bolts (2-Stage), lb-ft (Nm) ............... 73.7 (100.0)
Connecting Rod Bearing Cap (1-Stage), lb-ft (Nm) ............... 22.1 (30.0)
Connecting Rod Bearing Cap (2-Stage), lb-ft (Nm) ............... 44.2 (60.0)
Flywheel Assembly Mounting Bolts, lb-ft (Nm) ............... 62.6 (85.0)
Flywheel Housing Assembly Fixing Outer Bolts, lb-ft (Nm) ............... 36.8 (50.0)
Crankshaft Pulley Vibration Damper Central Nut, lb-ft (Nm) ............... 191.7 (260.0)
Camshaft Thrust Retaining Plate Locating Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Camshaft Drive Gear Center Mounting Bolt, lb-ft (Nm) ............... 66.3 (90.0)
Idler Gear Shaft Support Center Stub Bolt, lb-ft (Nm) ............... 36.8 (50.0)
Rocker Shaft Assembly Mounting Support Bolts, lb-ft (Nm) ............... 25.8 (35.0)
Rocker Clearance Adjusting Screw Locking Nuts, lb-ft (Nm) ............... 18.4 (25.0)
Valve Mechanism Protective Top Cover Fasteners, lb-ft (Nm) ............... 8.8 (12.0)
High Pressure Fuel Injection Pump Hub Mounting Bolts, lb-ft (Nm) ............... 18.4 (25.0)
High Pressure Fuel Injection Pump Driven Gear Nut, lb-ft (Nm) ............... 47.9 (65.0)
Fuel Injection Common Rail Fuel Supply Mounting Bolts, lb-ft (Nm) ............... 18.4 (25.0)
High Pressure Fuel Line Injection Pipe Couplings, lb-ft (Nm) ............... 22.1 (30.0)
Fuel Injector Assembly Hold Down Clamp Bolts, lb-ft (Nm) ............... 22.1 (30.0)
Oil Pan Perimeter Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Oil Pan Main Fluid Drainage Plug, lb-ft (Nm) ............... 33.1 (45.0)
Oil Pressure Relief Valve Assembly Body Plug, lb-ft (Nm) ............... 29.5 (40.0)
Oil Filter Assembly Base Mounting Fasteners, lb-ft (Nm) ............... 25.8 (35.0)
Exhaust Manifold Heat Duct Casting Mount Nut, lb-ft (Nm) ............... 25.8 (35.0)
Intake Manifold Induction Assembly Fixing Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Turbocharger Gas Charger Assembly Inward Exhaust Nuts, lb-ft (Nm) ............... 33.1 (45.0)
Exhaust Gas Recirculation Cooling Module Frame Fasteners, lb-ft (Nm) ............... 18.4 (25.0)
Cooling Water Pump Assembly Shell Housing Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Cooling Loop Fluid Thermostat Cover Distribution Pipe Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Alternator Pivot Base Swing Adjustment Support Bolt, lb-ft (Nm) ............... 33.1 (45.0)
Starter Motor Mounting Fixing Flange Bolts, lb-ft (Nm) ............... 47.9 (65.0)
Oil Pressure Monitoring Sensor Sending Unit, lb-ft (Nm) ............... 14.7 (20.0)
Coolant Temperature Thermal Switch Sensor, lb-ft (Nm) ............... 22.1 (30.0)
Crankshaft Positioning Sensor Bracket Small Bolt, lb-ft (Nm) ............... 7.3 (10.0)
Camshaft Phase Timing Positioning Sensor Bolt, lb-ft (Nm) ............... 7.3 (10.0)
Glow Plug Preheater Units, lb-ft (Nm) ............... 11.0 (15.0)
Lifting Attachment Brackets Bolts, lb-ft (Nm) ............... 36.8 (50.0)
Timing Gear Case Outer Cover Fasteners, lb-ft (Nm) ............... 18.4 (25.0)
Piston Cooling Oil Jet Nozzle Screws, lb-ft (Nm) ............... 8.8 (12.0)

________________________________________________________________________________________

• Doosan Engines Specs
  
• Doosan D18 Specs
  
• Doosan D24 Specs
  
• Doosan DL02 Specs
  
• Doosan DL03 Specs
  
• Doosan DM02VB Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________