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Detail Steps/Work Items Key Items/References
(7) If necessary, adjust the alternate air control cable. At the alternate air lever.
(8) Do items 5 to 7 again as necessary to get the correct settings.
(9) Connect the airplane battery. Refer to Section 24-34.
(10) Install the engine cowlings. Refer to Section 71-11.
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Page 208 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Section 71-70 % Engine Drains - Lycoming Engine
1. General
The IO-360-M1A engine installed in the DA 40 has these engine drains:
) Fuel/Oil drain for the engine-driven fuel-pump.
) Fuel drain for the fuel-flow-divider.
) Fuel drain for the induction manifold.
Refer to the Lycoming Operator's Manual for more data on the engine drains.
2. Description
A. Engine Driven Fuel Pump Drain
A clear tube makes the fuel drain for the engine driven fuel pump. The fuel pump is mounted on the rear accessory housing. The tube attaches to a pipe connector at the rear of the pump. Cable ties attach the tube to the engine breather pipe. The drain connects to the main drain tube assembly at the rear of the engine compartment.
B. Fuel Distributor Drain
A clear tube makes the fuel drain for the fuel distributor. The fuel distributor is mounted centrally on top of the engine. A hose clip attaches the drain tube to the drain outlet which is on the left side of the fuel distributor. The tube goes back through a rubber grommet in the engine cooling baffle and down the main drain tube assembly at the rear of the engine compartment.
C. Induction Manifold Drain
An aluminum alloy pipe makes the induction manifold drain. The induction manifold drain connection is at the bottom of the engine below the engine sump. The drain goes left from the drain connection and then aft over the exhaust muffler to the main drain tube assembly at the rear of the engine compartment. A vent valve in the pipe at the induction manifold end closes automatically when the engine runs.
Doc # 6.02.01 Page 1
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AIRCRAFT AMM
Fuel Flow Divider Drain
LYCOM ING LYCOMING
Fuel Pump Drain
Inlet Manifold
Drain
Fuel Flow
Inlet Manifold
Divider Drain
Drain
Figure 1: Engine Drains
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3. Operation
A. Engine Driven Fuel Pump Drain
The fuel pump drain is connected the fuel pump above the diaphragm. If the diaphragm ruptures, fuel will flow from the fuel pump drain outlet.
B. Fuel Distributor Drain
The fuel injector supplies pressurized fuel to one side of a diaphragm in the fuel distributor. Atmospheric air pressure acts on the other side of the diaphragm, assisted by a spring under a compression load. The fuel distributor drain connects to the air side of the diaphragm. If the diaphragm fails, then fuel will flow from the fuel distributor drain outlet.
C. Induction Manifold Drain
All four induction manifolds connect to a check-valve at the bottom of the manifold. The manifold drain attaches to the check-valve. When the engine is stationary, the check valve is open and any residual fuel can drain from the induction manifolds. When the engine operates, the check valve closes to seal the induction manifold.
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