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Oil is stored in the engine sump. Oil goes into the oil pump through an internal oil-way in the sump. The
inlet to the oil-way has a strainer. The outlet of the oil pump flows to the thermostatic oil by-pass valve.
When the oil is at normal operating temperature oil will flow through a flexible hose to the oil cooler.
When the oil is cold the thermostatic by-pass valve sends the oil directly to the oil filter.
The oil filter has a by-pass valve. The by-pass valve is normally closed. If the oil filter becomes blocked
the by-pass valve will open and oil will flow to the pressure regulating valve. From the oil pressure
regulating valve the oil flows around the engine and back to the sump.
AIRCRAFT
Oil System DA 40 Series
AMM
Page 2
20 Sep 2007 79-00-00 Doc # 6.02.01
Rev. 5
KEY Oil in Sump
Pressure Oil
Drain Plug Oil In Sump
Strainer
Pump
To Propeller
Governor
Pressure Regulating
Valve
Oil Filter
Oil Filter
By-pass Valve
Thermostatic
By-pass Valve
Oil Cooler
Breather
Main Bearings
Camshaft and
Valve Mechanism
Figure 1: Oil System Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Oil System
Doc # 6.02.01
Rev. 5 79-00-00 Page 101
20 Sep 2007
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/flexible hoses to oil
cooler blocked.
Oil cooler matrix dirty/blocked.
Oil cooler blocked internally.
Remove obstruction.
Clean oil cooler matrix.
Remove oil cooler and flush
with clean engine oil. Replace
oil cooler.
AIRCRAFT
Oil System DA 40 Series
AMM
Page 102
20 Sep 2007 79-00-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Oil System
Doc # 6.02.01
Rev. 5 79-00-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the oil cooler. For more data on the oil
system refer to the Lycoming Maintenance Manual.
2. Remove/Install the Oil Cooler
WARNING: DO NOT GET OIL ON YOU. OIL CAN CAUSE SKIN DISEASE.
CAUTION: ALWAYS PUT A CAP ON OPEN CONNECTIONS. IF YOU DO NOT PUT
A CAP ON OPEN CONNECTIONS, THEN CONTAMINATION CAN GET
INTO THE SYSTEM AND CAUSE DAMAGE.
CAUTION: DO NOT MIX OIL TYPES. IF YOU MIX OIL TYPES THE OIL CAN LOSE
ITS PROPERTIES AND THE ENGINE WILL WEAR MORE QUICKLY.
A. Remove the Oil Cooler
Detail Steps/Work Items Key Items/References
% WARNING: MAKE SURE THE ENGINE IS SAFE BEFORE YOU DO ANY WORK
ON THE OIL SYSTEM. IF THE ENGINE STARTS THE PROPELLER
CAN CAUSE INJURY OR DEATH.
(1) Make sure that the engine is safe:
S The ignition switch is set to OFF.
S The ALT/BAT switch is set to OFF.
S The throttle is set to IDLE.
S The mixture control is set to LEAN CUT-OFF.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Release the flexible hose from the connection at
the inboard end of the oil cooler.
Use a suitable container to catch the oil.
Put caps on the open connections.
(4) Release the flexible hose from the connection at
the outboard end of the oil cooler.
Use a suitable container to catch the oil.
Put caps on the open connections.
AIRCRAFT
Oil System DA 40 Series
AMM
Page 202
20 Sep 2007 79-00-00 Doc # 6.02.01
Rev. 5
90 Fitting
45 Fitting
To Top Oil Connector on
Engine Accessory Housing
To Bottom Oil Connector on
Engine Accessory Housing
Engine Mount
Figure 2: Oil Cooler Installation
AIRCRAFT
DA 40 Series
AMM
Oil System
Doc # 6.02.01
Rev. 5 79-00-00 Page 203
20 Sep 2007
Detail Steps/Work Items Key Items/References
(5) Remove the oil cooler:
S Release the nut, washer and bolt which
attach the bottom of the oil cooler to the
engine-mounting-frame.
S Release the nuts, washers and bolts which
attach the top of the oil cooler to the enginemounting-
frame.
S Move the oil cooler clear of the airplane.
Hold the oil cooler!
B. Install the Oil Cooler
Detail Steps/Work Items Key Items/References
(1) Put the oil cooler in position in the airplane.
(2) Install the bolts, washers and nuts which attach
the oil cooler to the engine-mounting-frame.
(3) Connect the flexible hose to the connection at the
　
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