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Diesel components, lubricating and cooling functions

Short answer

Main components are engine, alternator, air intake, exhaust, fuel, cooling, lubrication, starting, and governing systems. Lubrication reduces friction and wear, cools moving parts, seals the piston rings, cleans contaminants, and prevents corrosion. Cooling removes about 25-35% of fuel heat to avoid overheating, thermal stress, and oil film breakdown.

Sketch the main components of diesel power plant. Write down the main function of lubricating system and cooling system in diesel engine power plant.

A diesel power plant consists of a CI engine driving an alternator, together with auxiliary systems that supply fuel, air, cooling, lubrication and starting, and remove the exhaust.

Main components (sketch)

  Air filter -> Supercharger -+
                              v
 Fuel tank -> pump -> +--------------+
                      | DIESEL ENGINE|==> ALTERNATOR
 Air bottle --------> +--------------+
 (starting)             |    |    |
      Lube oil tank <---+    |    +--> Silencer -> Stack
      filter, cooler         v
                 Jacket water -> Heat exch -> Cooling tower
  1. Engine – converts fuel energy to shaft work (2- or 4-stroke).
  2. Air intake system – air filters, ducts and supercharger.
  3. Exhaust system – exhaust manifold, silencer, stack; sometimes waste-heat boiler.
  4. Fuel system – storage tank, day tank, filters, injection pump, injectors.
  5. Cooling system – pumps, heat exchanger, cooling tower/radiator.
  6. Lubricating system – oil tank, pump, filter, oil cooler.
  7. Starting system – air compressor and air bottles (or battery motor).
  8. Governing system – controls fuel supply to keep speed constant.

Functions of the lubricating system

  • Reduces friction and wear between moving parts (piston and liner, bearings, gears) by keeping an oil film.
  • Cools the parts: oil carries heat away from bearings and piston crowns.
  • Seals the gap between piston rings and liner, preventing gas leakage.
  • Cleans the engine by carrying away carbon and metal particles to the filter.
  • Protects surfaces against corrosion and absorbs shocks in bearings.

Functions of the cooling system

  • About 25–35 % of fuel heat goes into the cylinder walls, head and piston. The cooling system removes this heat so that metal temperatures stay within safe limits.
  • Prevents thermal stresses, cracking and distortion of cylinder head and liner.
  • Prevents breakdown of the lubricating oil film at high temperature, which would cause seizure.
  • Keeps the engine at a suitable working temperature for good combustion and efficiency (over-cooling is also avoided).

✓ Answer checked by Claude Opus 5.5 (high effort)

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