Engine Lubrication System - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

CESSNA
MODEL 208B 867 SHP
GARMIN G1000

ENGINE LUBRICATION SYSTEM

The lubrication system consists of a pressure system, a scavenge
system and a breather system. The main components of the lubrication
system include an integral oil tank at the back of the engine, an oil
pressure pump at the bottom of the oil tank, an external double-element
scavenge pump located on the back of the accessory case, an internal
double-element scavenge pump located inside the accessory gearbox,
an oil-to-fuel heater located on the bottom of the accessory case, an oil
filter located internally on the right side of the oil tank, and an oil cooler
located on the right side of the nose cowl.
Oil is drawn from the bottom of the oil tank through a filter screen where
it passes through a pressure relief valve for regulation of oil pressure.
The pressure oil is then delivered from the main oil pump to the oil filter
where extraneous matter is removed from the oil and precluded from
further circulation. Pressure oil is then routed through passageways to
the engine bearings, reduction gears, accessory drives, torquemeter,
and propeller governor. Also, pressure oil is routed to the oil-to-fuel
heater where it then returns to the oil tank
After cooling and lubricating the engine moving parts, oil is scavenged
as follows:
1. Oil from the number 1 bearing compartment is returned by gravity
into the accessory gearbox.
2. Oil from the number 2 bearing is scavenged by the front element
of the internal scavenge pump back into the accessory gearbox.
3. Oil from the number 3 and number 4 bearings is scavenged by
the front element of the external scavenge pump into the
accessory gearbox.
4. Oil from the propeller governor, front thrust bearing, reduction
gear accessory drives, and torquemeter is scavenged by the rear
element of the external scavenge pump where it is routed through
a thermostatically-controlled oil cooler and then returned to the oil
tank.
5. The rear element of the internal scavenge pump scavenges oil
from the accessory case and routes it through the oil cooler
where it then returns to the oil tank.
208BPHCUS-01
AIRPLANE AND SYSTEMS DESCRIPTION
(Continued Next Page)
SECTION 7
7-59
U.S.