The main mechanism components for diesel engine repair generally include: body, crank and connecting rod mechanism, air distribution mechanism, fuel system, lubrication system, cooling system, and electrical system.

1. Body: the skeleton of the diesel engine, which supports and installs other components, including: cylinder block, cylinder liner, cylinder head, cylinder head gasket, oil pan, flywheel housing, timing gear housing, front and rear feet.

2. Crank connecting rod mechanism: It is the main moving part of diesel engine. It can transfer the energy generated by fuel combustion into mechanical energy through piston, piston pin, connecting rod, crankshaft and flywheel. Including crankshafts, connecting rods, pistons, piston pins, piston pin circlips, piston pin bushings, piston rings, main bearings, connecting rod bearings, thrust bearings, front and rear crankshaft oil seals, flywheels, shock absorbers, etc.

3. Air distribution mechanism: the intake and exhaust valves are opened and closed at regular intervals. Including timing gears, camshafts, tappets, jacks, rocker arms, valves, valve springs, valve seats, valve guides, valve lock blocks, intake and exhaust pipes, air filters, silencers, superchargers, etc. .

4. Fuel supply system: according to the needs of the diesel engine, the diesel fuel is supplied to the combustion chamber in a fixed and quantitative manner. Including diesel tank, fuel pipe, diesel filter, fuel injection pump, fuel injector, etc.

5. Lubrication system: It supplies lubricating oil to each movement friction pair, including oil pump, oil filter, pressure regulating valve, pipeline, instrument, oil cooler, etc.

6. Cooling system: It radiates the heat generated by the diesel engine to the atmosphere. Including water tank, water pump, fan, water pipe, thermostat, water filter, fan belt, water temperature meter, etc.

7. Electrical appliances: auxiliary equipment for starting, lighting, monitoring, and operation. Including generators, starting motors, batteries, relays, switches, wiring, etc.