C. Mixture Control
Figure 3 shows the mixture control installation. The mixture control lever sets the mixture between
RICH and LEAN. It also stops the fuel supply to the engine when set to CUT-OFF. The mixture
control lever attaches to the engine control assembly.
The mixture control lever has a lock-out lever attached. The lock-out lever prevents accidental
movement of the mixture control lever. The spring loaded lock-out lever engages in a toothed rack.
The toothed rack attaches to the tubular spacers at the right side of the engine control assembly.
A Bowden cable connects between the mixture control lever in the cockpit and the mixture lever
at the carburetor. The Bowden cable wire end attaches to the mixture control lever through a hole
in a swivel fitting. A screw locks the wire end in position. A small bracket holds the inboard end of
the swivel fitting. Two nuts, bolts and washers attach the bracket to the mixture control lever.
The outer sheath of the Bowden cable has a threaded end fitting. Two nuts attach the end fitting
to a bracket attached between the sides of the engine control assembly. The Bowden cable goes
from the center console up, in front of the instrument panel and through the firewall to the engine
bay. A feed-thru fitting holds the cable in position at the firewall. A fire resistant compound seals
the Bowden cable where it goes through the firewall.
From the firewall the Bowden cable goes down under the engine to the fuel mixture lever on the
carburetor. The threaded end of the Bowden cable outer sheath is attached to the engine controls
bracket with two nuts. You can adjust the range of movement of the mixture control lever at this
position. The Bowden cable eye end fitting attaches to the mixture lever with a long bolt, spacer,
washer and nut.
The eye end is adjustable. You can use this adjustment to set the correct range of movement of
the mixture lever.
Doc # 6.02.01 Page 7
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DA 40 Series AMM
DA 40 F
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DA 40 F
Trouble-Shooting
1. General
Use the data below to trouble-shoot the engine controls. See also the Lycoming Maintenance Manual for the engine.
Complaint Possible Cause Remedy
Engine will not start. Mixture controls not correctly adjusted. Do a range of movement check. Adjust the mixture controls.
Engine will not cut-off. Mixture controls not correctly adjusted. Do a range of movement check. Adjust the mixture controls.
Cannot control the engine. Broken throttle Bowden cable. Throttle control not set correctly. Bowden cable not free to move. Replace the broken cable. Do a range of movement check. Adjust the throttle controls. Replace the Bowden cable.
Throttle lever hard to move. Friction adjuster incorrectly set. Throttle control lever restriction. Check/adjust friction adjuster. Remove the restriction.
Engine does not give full power. Throttle lever touches the cockpit stop before the lever on the engine touches its stop. Do a range of movement check. Adjust the throttle controls.
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