Daedong DSC48 - ENGINE

TABLE OF CONTENTS
ENGINE
DSC48
1. GENERAL ............................................... 2-2
1.1 Appearance .............................................. 2-2
1.2 Specifi cations ........................................... 2-3
1.3 Dimensions .............................................. 2-4
1.4 General precautions ................................. 2-4
2. STRUCTURE AND FUNCTION .............. 2-5
2.1 Body ........................................................ 2-5
2.1.1 Cylinder head ............................... 2-5
2.1.2 Cylinder block .............................. 2-5
2.1.3 Crankshaft ....................................2-6
2.1.4 Piston and piston ring ..................2-6
2.1.5 Connecting rod ............................. 2-6
2.1.6 Camshaft ......................................2-7
2.1.7 Fuel camshaft .............................. 2-7
2.1.8 Rocker arm .................................. 2-7
2.1.9 Intake and exhaust valves ...........2-8
2.1.10 Timing gear .................................. 2-8
2.1.11 Flywheel ....................................... 2-8
2.2 Lubricating system ................................... 2-9
2.2.1 Flow of lubricating oil ...................... 2-9
2.2.2 Oil pump ......................................... 2-9
2.2.3 Oil fi lter and relief valve ................ 2-10
2.2.4 Oil switch ...................................... 2-10
2.3 Cooling system ....................................... 2-11
2.3.1 Flow of cooling water .................... 2-11
2.3.2 Water pump .................................. 2-11
2.3.3 Radiator ........................................ 2-12
2.3.4 Radiator cap ................................. 2-12
2.4 Fuel system ............................................ 2-13
2.4.1 Flow of fuel ................................... 2-13
2.4.2 Fuel feed pump ............................. 2-13
2.4.3 Fuel injection pump ...................... 2-14
2.4.5 Fuel injection nozzle ..................... 2-16
2.4.6 Governor ....................................... 2-17
2.5 Intake and exhaust system ....................2-20
2.5.1 Flow of intake air and exhaust gas
...................................................... 2-20
2.5.2 Air cleaner .................................... 2-20
2.5.3 Muffl er ...........................................2-20
3. DISASSEMBLY AND SERVICE ............ 2-21
3.1 Troubleshooting ...................................... 2-21
3.2 Service specifi cations ............................. 2-23
3.2.1 Engine body .................................. 2-23
3.2.2 Lubricating system ........................ 2-27
3.2.3 Cooling system ............................. 2-27
3.2.4 Fuel system .................................. 2-27
3.2.5 Tightening torque .......................... 2-28
3.3 Check, disassembly and adjustment ...... 2-29
3.3.1 Exploded view .............................. 2-29
3.3.2 External components .................... 2-31
3.3.3 Engine body .................................. 2-32
3.3.4 Disassembly and assembly .......... 2-33
3.3.5 Servicing ....................................... 2-42
3.3.5 Lubricating system ........................ 2-53
3.3.6 Cooling system ............................. 2-55
3.3.7 Fuel system .................................. 2-57