While applying lubrication to engine parts one should choose good lubricant to make the engine run efficiently.
- To reduce the frictional forces between the parts having relative motion by minimizing the force of friction and ensures smooth running of engine.
- To reduce the wear and tear of moving parts.
- To cool the surfaces by carrying away the heat generated due to friction.
- To seal a space adjoining the surfaces such as piston rings and cylinder linear.
- To absorb the shocks between bearings and other parts and consequently, reduce noise.
- To act as cleaning agent and removing dirt, grit and any deposits that might be present between the moving parts of an automobile.
- To help the piston rings to seal the gases inside the piston cylinder.
The main parts of the engine which need lubrication are:
- Main crank shaft bearings.
- Big end bearings or crank pin.
- Gudgeon in bearings.
- Piston rings and cylindrical walls.
- Timing gears.
- Camshaft and cam shaft bearings.
- Valve mechanism
- Valve guide, valve tappets, rocker arms.
- Governor and
- Water pump bearing.