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 71-12.
(3) Start the engine. Refer to Paragraph 7.
(4) Set the mixture control to fully RICH. Fully forward.
(5) Operate the engine at 1500 RPM until it runs smoothly. Obey the operating limits in the Lycoming Operator's Manual.
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Detail Steps/Work Items Key Items/References
(6) Set the throttle to IDLE. Allow the idle RPM to become stable.
(7) Make a note of the difference in RPM with the engine cowlings removed.
(8) 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.
(9) 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.
(10) Start the engine. Refer to Paragraph 7.
(11) Measure the mixture control setting. Refer to Paragraph 8.A.
(12) Repeat items (8) to (11) as necessary.
(13) Shut-down the engine. Refer to Paragraph 9.
(14) Install the cowlings. Refer to Section 71-12.
(15) Start the engine. Refer to Paragraph 7.
(16) Measure the mixture control setting. Refer to Paragraph 8.A.
(17) Shut-down the engine. Refer to Paragraph 9.
DA 40 F
9. Engine Shut-Down
Detail Steps/Work Items Key Items/References
(1) Set the mixture control to fully RICH. Fully forward.
(2) Set the throttle lever to IDLE. Fully back. Let the engine idle until the cylinder head temperature decreases.
(3) Set 1000 RPM with the throttle lever.
(4) Move the mixture control to fully LEAN. The engine must stop within 5 seconds.
(5) 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.
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