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inboard end of the oil cooler.
Remove the blanking caps.
(4) Connect the flexible hose to the connection at the
outboard end of the oil cooler.
Remove the blanking caps.
(5) Install the engine cowlings. Refer to Section 71-10.
(6) Fill the engine with oil to the correct level. Refer to Section 12-10.
(7) Do an engine ground run-up. Monitor the oil
temperature. Look specially for oil leaks.
The oil temperature indicator must
show the relevant oil temperature.
Refer to the DA 40 Airplane Flight
Manual.
(8) Stop the engine
(9) Do a test for oil leaks:
S Remove the engine cowlings.
S Look for oil leaks, specially around the
connections to the oil cooler.
S Install the engine cowlings.
Refer to Section 71-10.
Refer to Section 71-10.
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Oil System DA 40 Series
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DA 40 Series
AMM
Oil System
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Rev. 5 79-01-00 Page 1
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Section 79-01
Oil System - TAE 125 Diesel Engine
1. General
This Section tells you about the airframe parts of the engine oil system. These are the only parts that
you can replace except the oil filter. Refer to Chapter 72 for data about the oil filter.
2. Engine Oil System
Figure 1 shows the oil system schematic diagram. Figure 2 shows the component locations. The
engine has the usual wet-sump lubrication system. The bottom part of the engine crankcase makes
the sump. An oil filler tube with a screw cap connects to the crankcase on the left of the engine.
Two flexible hoses adjacent to the engine oil filter housing connect to the oil radiator. The oil radiator
is located below the engine at the back.
The oil breather system has an oil pre-separator located on the engine crankcase adjacent to the oil
filler. A flexible hose connects the oil pre-separator to the oil separator. The oil separator is located at
the rear, left of the engine compartment. A flexible hose from the top of the oil separator vents blow-by
% gases and any remaining oil mist overboard. A flexible hose connects the bottom of the oil separator
% to the catch tank of the turbo-charger. From the catch tank a flexible hose connects to the engine oil
% sump via the auxiliary oil pump.
%
%
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%
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Figure 1: Oil System Schematic Diagram
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Oil System DA 40 Series
AMM
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Oil Pre-Separator Oil Radiator
Oil Separator
Oil Return Line
Overboard Vent
Oil Return from Oil Radiator
Oil Supply to Oil Radiator
Oil Filter Housing
Oil Pressure Sensor
Oil Thermostat Housing
Oil Filler
Combined
Oil Pump
Oil Return from
Turbo-Charger
Breather Line
Oil Temperature Sensor
(behind Oil Filler)
Figure 2: Oil System Component Locations
An oil pump in the engine takes oil from the sump. The oil flows through a filter and oil thermostat to
the oil radiator. Air passing through the oil radiator cools the oil. The cool oil returns to the engine. Oil
galleries in the engine take the oil to all bearings. If the oil is colder than 80 °C, the oil thermostat
sends the oil directly to the engine oil galleries.
AIRCRAFT
DA 40 Series
AMM
Oil System
Doc # 6.02.01
Rev. 5 79-01-00 Page 101
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Trouble-Shooting
1. General
The table below lists the defects you could have with the oil system. If you have the trouble detailed
in the Trouble column read across to the Possible Cause column. Then do the repair given in the
Repair column.
Trouble Possible Cause Repair
Engine oil temperature too
high.
Air inlet to oil radiator blocked. Remove obstruction.
Oil radiator matrix
dirty/blocked.
Clean oil radiator matrix.
Oil radiator blocked internally. Remove oil radiator and flush
with clean engine oil. Replace
oil radiator.
Low oil level. Refill oil. Refer to Section
12-10.
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Oil System DA 40 Series
AMM
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DA 40 Series
AMM
Oil System
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Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the oil radiator.
2. Remove/Install the Oil Radiator
WARNING: DO NOT GET OIL ON YOU. OIL CAN CAUSE SKIN DISEASE.
　
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