81 SA Flyer MagazineHowever, there are additives which provide
protection against corrosion during normal
operation of the engine.
CLEANING THE INTERIOR
Ashless dispersant oil (e.g. Shell W100,
Shell W100 Plus) keeps your engine clean
by using additives that cause the dirt to
disperse throughout the oil and prevent
it from precipitating out of the oil and
collecting in the engine when the oil is
at rest. This is a very important function,
since the many oil passages could become
clogged with dirt and cause oil starvation.
Hydraulic lifters need clean oil to work
properly, otherwise they clog with dirt and
sludge and cease to carry out their very
important function.
COOLING
Moving parts generate friction, which
in turn produces heat. Lubricating oil
eliminates metal to metal contact, and the
constant flow of oil to all these moving
parts carries away the heat. The cylinder
head, for example, is exposed to extreme
temperatures during normal combustion.
Engine oil, the cooling fins, engine baffling
and so on, all remove excessive heat from
these areas.
SEALING
A thin film of oil on the cylinder walls
not only lubricates, but helps provide the
necessary combustion gas seal between
the piston rings and cylinder walls. A
complete gas-tight seal between the rings
and walls is never completely attained,
so the oil is subjected to high pressure
and temperature blow-by, allowing hot
contaminated gasses to pass the piston
rings into the crankcase of the engine.DIRT CONTAMINATED OIL
It is evident that while the engine
lubricating oil in your engine is carrying out
all of these functions, it is subjected to a
vast number of demands. Apart from the
internal corrosion, dirty and worn out oil is a
major contributing factor to engine wear.
Modern day high compression engines
subject the lubricating oil to severe
stresses. The oils undergo a continuous
sheaving action from many of the moving
parts in the engine. In time, the sheaving
action will alter the oil’s original viscosity.
Once this happens to the oil, its continued
use will lead to a reduction in the life of the
engine.
As the oil flows through the engine
carrying out its many functions, it collects
heat. The oil temperature on the instrument
panel is normally oil leaving the oil cooler –
after it has been cooled down. It is therefore
fair to make the assumption that the actual
oil temperatures are much higher during
the course of its operation. These high
temperatures subject the oil to coking and
oxidation. Coking dirties the oil with carbon
particles, while oxidation causes the oil to
break down and thicken.
A filter will remove much of the
coking but nothing can be done about
the oxidation. Both of these effects cause
harmful destruction to the oil, and if this
oil is left to continue operation past the
manufacturers’ recommendations, you are
asking for big trouble.
Low oil temperature is also harmful to
engines because burning-off harmful acidscolumns
SA Flyer 2013|02SA Flyer 2017|09Nico van Staden 083 321 0916
[email protected]
Mary Ann 083 778 9293All aircraft prices are subject to change or withdrawal from the market without notice. All prices exclude VAT
1978 Arrow III
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Planes that aren't flown
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terms of hours flown.