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(2) Install the air intake to the bracket at the
bottom of the engine:
− Put the air intake in position on the
bracket.
− Install the bolts with the nuts and
washers.
− Lock wire the bolts.
− Make sure the two flexible hoses are
clear of debris.
− Connect the two flexible hoses to the air
intake.
− Install the two worm drive clamps to the
flexible hoses at the air intake.
(3) Install the control cable to the alternate air
lever. Install these items:
− Bolt
− Washer
− Control cable eye-end
− Return spring
− Lever arm
− Washer
− Nut
Tighten the assembly.
Torque to 1.7 Nm (1.2 ft.lbs)
(4) Do a test for correct, full and free movement
of the alternate air control. If necessary,
adjust the alternate air control.
Refer to Chapter 76-00.
(5) Install the engine cowlings. Refer to Chapter 71-10.
DA20-C1 AMM
Power Plant
Doc # DA201-C1
Rev. 9 71-70-00 Page 1
29 Apr 2004
CHAPTER 71-70
ENGINE DRAINS
1. General
The IO-240B series engine installed in the DA20-C1 has these engine drains:
− Fuel drain from the fuel distribution manifold.
− Fuel drain from the four cylinders.
− Fuel drain from the fuel pump.
Refer to the Teledyne Continental Motors Maintenance Manual for more data on the engine drains.
2. Description
A. Fuel Distribution Manifold Drain
Rubber hose makes the drain pipe for the fuel distribution manifold. The drain pipe connects to
the right side of the fuel distribution manifold at the top of the engine. The drain pipe goes
rearwards from the fuel distribution manifold through the aft baffle to the right side of the engine.
At the bottom of the engine the drain pipe connects to the fuel drain assembly at the bottom of
the firewall. Fuel draining from the drain pipe shows you that the internal diaphragm in the fuel
distribution manifold has failed.
B. Cylinder Drain
Aluminum alloy makes the drain pipes for the four cylinders. The drain pipes connect from the
cylinder heads to a “T” piece connector below the engine. From the “T” piece connector the
drain pipes connect to a single pipe on the left side of the engine. The pipe has a check valve
installed. Rubber hose connects the outlet from the check-valve to a fuel drain assembly at the
bottom of the firewall.
When the engine starts the check valve closes. At engine start and engine shut down remaining
fuel from the cylinders drains through the drain pipe at the bottom of the engine cowling.
Power Plant
DA20-C1 AMM
Page 2
23 Jun 2004 71-70-00 Doc # DA201-C1
Rev. 10
Engine Cylinder
Drain Connection
T-Piece
Injector Pump
Gland Drain
From Fuel Manifold
See Figure 2
Type 2 Drains
Rubber Tubes
Fuel Drain
Outlet Assembly
Ty-Wrap
Hose
Clamps
Ambient Pressure
Line
Aft Fuel Pump
Drain Line
Forward Fuel
Pump Drain Line
Detail A
(Aircraft with altitude compensating
fuel pump only)
Figure 1: Drains On The Left Side Of The Engine
DA20-C1 AMM
Power Plant
Doc # DA201-C1
Rev. 10 71-70-00 Page 3
23 Jun 2004
C. Fuel Pump Drain
The drain pipe for the fuel pump is made of aluminum alloy. The drain pipe connects to the fuel
injection pump at the left side of the engine. From the injection pump the drain pipe goes below
the engine rearwards where it attaches with P-clips to the engine. Rubber hose connects the aft
end of the drain pipe to a fuel drain assembly at the bottom of the firewall. Fuel draining from
the drain pipe indicates that the internal fuel pump seal has failed.
On aircraft equipped with an altitude compensating fuel pump, there is an aluminum pipe that
runs from the ambient pressure reference port of the fuel pump to the fuel pump drain line. The
pressure reference line connects to a “T” fitting installed in the fuel drain line.
Power Plant
DA20-C1 AMM
Page 4
24 Mar 1999 71-70-00 Doc # DA201-C1
Rev. 1
Figure 2: Drains On The Right Side Of The Engine
Fuel Manifold Drain
Fuel Drain Outlet Assembly
(See Figure 1)
Oil/Air Separator Vent Pipe
DA20-C1 AMM
Power Plant
Doc # DA201-C1
Rev. 0 71-70-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
The table below lists the defects you could have with the engine drains. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair in the
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