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EO M232.04 Explain the functions of oil in a four-stroke pis
Transcript of EO M232.04 Explain the functions of oil in a four-stroke pis
EO M232.04 Explain the functions of oil in a four-stroke piston-powered engine
Oil creates a smooth surface between parts.
Has different grades and viscositie
The viscosity affects the oil’s stickiness, with low-viscosity flowing more easily than high-viscosity.
Oil thins as the temperature raises.
Engine manufacturers will often specify what oils to use and this direction should be followed to avoid engine wear.
Oil has four roles
Oil prevents the expanding gases from leaking out during the power stroke.
It does so by creating a barrier between the engine components
High viscosity oil provides the best seal for the combustion chamber.
Low viscosity allows more oil to be delivered to bearing surfaces.
Engine parts get hot and needs to be cooled.
Oil carries the heat away and equalizes the temperature within the engine.
Oil must maintain its viscosity while it’s near the heat of the combustion chamber.
Once again, this is taken into account when specifying what oil to use.
Oil removes and holds tiny particles and grit (which are harmful to the engine).
Oil carries away dirt and debris from the engine as it flows through.
Oil and the oil filter has to be changed regularly