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(5) Set the propeller control to MAX RPM.
(6) Set the mixture control to full RICH.
(7) Operate the engine at 1500 RPM until it runs
smoothly.
Obey the operating limits in the
Lycoming Operator's Manual.
(8) Set the throttle to IDLE. Allow the idle RPM to become stable.
(9) Make a note of the difference in idle RPM with
the engine cowlings removed.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 246
20 Sep 2007 71-00-00 Doc # 6.02.01
Rev. 5
To Fuel Distributor
Fuel Supply
From Pump
RH SIDE
LH SIDE
Gasket
Idle
Stop Screw Idle Mixture
Adjustment
Mixture
Control
Throttle Control
Fuel Pressure
Sensor
Figure 7: Adjust the Idle/Mixture at the Fuel Injector
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-00-00 Page 247
20 Sep 2007
Detail Steps/Work Items Key Items/References
(10) Shut down the engine. Refer to Paragraph 9.
WARNING: DO NOT TOUCH THE EXHAUST SYSTEM. THE EXHAUST IS VERY
HOT, IT CAN BURN SKIN AND IT CAN BURN CLOTHING.
(11) Adjust the idle-stop screw on the injector. Turn the screw clockwise to increase
idle RPM. Turn the screw counterclockwise
to decrease idle RPM.
(12) Start the engine. Refer to Paragraph 7.
(13) Measure the idle RPM. Refer to Paragraph 6.A. Make an
allowance for the difference in idle RPM
with the cowlings removed.
(14) Repeat items (10) to (13) as necessary.
(15) Shut down the engine. Refer to Paragraph 9.
(16) Install the cowlings. Refer to Section 71-10.
C. Adjust the Engine Mixture Control
Do this item only if a test shows that the mixture is incorrect.
Detail Steps/Work Items Key Items/References
Note: Do this work quickly. If the oil temperature is less than 80 °C, it can change the
idle RPM.
(1) Shut-down the engine. Refer to Paragraph 9.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Start the engine. Refer to Paragraph 7.
(4) Set the propeller control to MAX RPM. Fully forward.
(5) Set the mixture control to fully RICH. Fully forward.
(6) Operate the engine at 1500 RPM until it runs
smoothly.
Obey the operating limits in the
Lycoming Operator's Manual.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 248
20 Sep 2007 71-00-00 Doc # 6.02.01
Rev. 5
Detail Steps/Work Items Key Items/References
(7) Set the throttle to IDLE. Allow the idle RPM to become stable.
(8) Make a note of the difference in RPM with the
engine cowlings removed.
(9) Shut-down the engine. Refer to Paragraph 9.
WARNING: DO NOT TOUCH THE EXHAUST SYSTEM. THE EXHAUST IS VERY
HOT, IT CAN BURN SKIN AND IT CAN BURN CLOTHING.
(10) Adjust the mixture on the injector. If you turn the thumb-screw to make the
linkage shorter, you make the mixture
more lean. If you turn the thumb-screw
to make the linkage longer, you make
the mixture more rich.
Note: Make sure that the idle RPM is within limits. Make an allowance for the
difference in idle RPM with the engine cowlings removed. The idle RPM can
change when you adjust the mixture. If the idle RPM is not in limits, adjust the
idle RPM. See Paragraph 8.B.
(11) Start the engine. Refer to Paragraph 7.
(12) Measure the mixture control setting. Refer to Paragraph 8.A.
(13) Repeat items (9) to (12) as necessary.
(14) Shut-down the engine. Refer to Paragraph 9.
(15) Install the cowlings. Refer to Section 71-10.
(16) Start the engine. Refer to Paragraph 7.
(17) Measure the mixture control setting. Refer to Paragraph 8.A.
(18) Shut-down the engine. Refer to Paragraph 9.
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-00-00 Page 249
20 Sep 2007
9. Engine Shut-Down
Detail Steps/Work Items Key Items/References
(1) Set the mixture control to fully RICH. Fully forward.
(2) Set the propeller control to MAX RPM. Fully forward.
(3) Set the throttle lever to IDLE. Fully back. Let the engine idle until the
cylinder head temperature decreases.
(4) Set 1000 RPM with the throttle lever.
(5) Move the mixture control to fully LEAN. The engine must stop within 5 seconds.
(6) Set the ALT/BAT switch to OFF.
10. After Engine Shut-Down
Detail Steps/Work Items Key Items/References
(1) Read the engine oil level. Add oil if necessary. Refer to Section12-10.
(2) Look under the bottom cowling for signs of oil
leaks and signs of fuel leaks.
(3) Install the Pitot probe cover.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 250
20 Sep 2007 71-00-00 Doc # 6.02.01
　
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