PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 2
d. Oil Strainer and Pickup (figure 53 on the previous page). Most manufacturers
of in-line and V-type engines place at least one oil strainer or screen in the
lubrication system.
The screen is usually a fine mesh bronze screen, located in
the oil sump on the end of the oil pickup tube.
The oil pickup tube is then
threaded directly into the pump inlet or may attach to the pump by a bolted flange.
A fixed-type strainer, like the one described, is located so that a constant supply
of oil will be assured. Some automotive engines use a pickup that is hinged from
the oil pump. The pickup is designed to float on top of the oil, thus preventing
sediment from being drawn into the oiling system.
e.
(1) General (figure 54 on the following page).
The oil filter removes most of
the impurities that have been picked up by the oil as it is circulated through the
engine.
The filter is mounted outside the engine and is designed to be readily
replaceable.
(2) Filter Configurations (figure 54).
There are two
basic
filter
element
configurations: the cartridge-type and the sealed cam-type.
(a) The cartridge-type filter element fits into a permanent metal container.
Oil is pumped under pressure into the container where it passes from the outside of
the filter element to the center.
From here the oil exits the container.
The
element is changed easily by removing the cover from the container when this type
of filter is used.
(b) The
sealed
cam-type
filter
element
is
completely
self-contained,
consisting of an integral metal container and filter element. Oil is pumped into
the container on the outside of the filter element.
The oil then passes through
the filter medium to the center of the element where it exits the container. This
type of filter is screwed onto its base and is removed by spinning it off.
(3) Filter Medium Materials (figure 55 on page 70).
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