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Saturday, 28 February 2015

Car Care 101: Lubricating Your Car Engine

Oil lubrication is vital to vehicle engine system
such that it provides a barrier between rotating
engine parts to prevent damage by friction,
damage which can result in huge auto repair
bills. The engine lubrication system includes the
oil pump, oil filter, lubricating oil and the oil
passages. The engine oil provides a method of
cooling engine parts that are not cooled by the
engine cooling system. Engine oil helps to
protect engine components from corrosion by
neutralizing harmful chemicals that are the by-
product of combustion.
To protect moving parts and reduce friction,
automotive engine oil provides a barrier
between the rotating or moving engine
components. Ideally, a film of oil should
exist between moving components. This is
called full film lubrication. In order to
achieve full film lubrication, a constant
supply of clean oil is required. The engine
oil system constantly filters and circulates
engine oil to ensure that all components are
protected.
The engine oil is stored in the crankcase. Most
engines hold between 4 to 6 quarts of oil. The
engine oil pump pressurizes and circulates the
engine oil.
The oil will flow from the OIL PUMP to the OIL
FILTER , where it is cleaned. The cleaned engine
oil then moves through passages, into the
CRANKSHAFT where it circulates through the
engine bearings. The crankshaft has passages
bored into it that allows oil to travel to all the
bearing surfaces. The CYLINDER WALLS and
PISTONS are lubricated by the oil that is thrown
from the CRANKSHAFT as it rotates. This is
sometimes referred to as SPLASH LUBRICATION.
Engine oil will leave the CRANKSHAFT, usually at
a passage in one of the main bearings and is fed
to the CAMSHAFT and LIFTERS . On some
overhead valve engines, oil will travel through the
PUSHRODS up to the VALVE TRAIN to lubricate
the rocker arms. Other designs use a passage to
feed oil through a ROCKER ARM shaft to achieve
the same purpose. The oil then returns to the
CRANKCASE by return holes in the cylinder
heads. It is then picked up by the OIL PUMP to
be circulated again.
This process is more or less like a circular
movement ::> From the OIL PUMP to the OIL FILTER to
the CRANKSHAFT to the CAMSHAFT/LIFTERS to
the VALVE TRAIN to the CRANKCASE then back to
the OIL PUMP .
To be continued...

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