ENGINE LUBRICATION SYSTEM.
The main components of the engine lubrication system
include the oil pump, oil cooler, oil filter, and oil pressure
sensing devices. The lubrication of the engine is of the
force feed type. The oil is circulated by a gear type
pump internal to the engine balancer unit mounted to the
bottom of the engine block inside the oil sump. The oil is
drawn through a sump strainer tube to the pump. Oil is
then pumped to the engine internal oil passages.
The oil pump provides a high pressure oil flow to a
through port on the engine oil adapter plate. A supply
hose connected to the port routes the high pressure oil to
the oil cooler and filter. A pressure tap off the high
pressure port supplies oil to an engine oil pressure
transmitter. The resistance of the transmitter changes
based on the sensed oil pressure. A pressure gauge on
the operator gauge panel displays the oil pressure.
Inside the oil cooler high pressure oil flows through
cooling vanes and into the oil filter. Engine coolant
circulates through the oil cooler, removing excess heat
from the engine oil. A replaceable filter element in the oil
filter removes particulates from the engine oil. Filtered
oil is routed back to the return port on the engine oil
adapter plate. Oil returned from cooling and filtration
flows into the engine oil gallery inside the engine block.
The oil is then routed throughout the engine.
An oil sampling valve and STE/ICER oil pressure
transmitter are located at the input to the oil cooler and
filter. Oil filter input and output pressures are monitored
by a differential pressure transmitter. When filter
contamination inhibits oil flow, the transmitter turns on.
The transmitter condition can be detected at the DCA
connector using STE/ICER Test Nos. 35 and 36.