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(7) Install the engine cowlings. Refer to Section 71-11.
(8) Do a ground run-up. Refer to Section 71-01.
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Engine Indicating DA 40 Series
AMM
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DA 40 Series
AMM
Exhaust
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CHAPTER 78
EXHAUST
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Exhaust DA 40 Series
AMM
Page 2
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DA 40 Series
AMM
Exhaust
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TABLE OF CONTENTS
CHAPTER 78
EXHAUST
Section 78-00
Exhaust - Lycoming Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Exhaust Muffler . . . . . . . . . . . . . . . . . . . . . . . 201
3. Remove/Install an Exhaust Down-Pipe . . . . . . . . . . . . . . . . . . . . . 203
4. Inspect the Exhaust Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Section 78-01
Exhaust - TAE 125 Diesel Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
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Exhaust DA 40 Series
AMM
Page 2
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Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Rear Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . 201
3. Remove/Install the Front Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . 203
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DA 40 Series
AMM
Exhaust
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CHAPTER 78
EXHAUST
Section 78-00
Exhaust - Lycoming Engine
1. General
The DA 40 with the Lycoming engine has a single exhaust system. Four exhaust down-pipes connect
the exhaust ports on the cylinder heads to an exhaust muffler. The muffler has a shroud. The shroud
makes a heat-exchanger system for supplying heated air for the cabin heating system.
Refer to Section 21-40 for data about the cabin heating.
2. Description
Welded stainless-steel makes the exhaust system. Four down-pipes attach to the cylinder exhaust
ports with nuts and washers. A special gasket makes a gas-tight seal between the exhaust port and
the flange of the down-pipe.
The bottom end of the down-pipe connects to the exhaust muffler with two expansion joints which are
connected with a connection tube. The expansion joint allows the exhaust system to expand and move
when it gets hot. Nuts, bolts and washers hold the expansion joint together.
A metal shroud and an inliner go around the outside of the muffler. Screws and thread plates clamp
the muffler in position. The shroud has stub-pipes at the front and at the rear. The space between the
inliner of the muffler and the shroud makes the heat exchanger for the cabin heat system.
% If installed (MÄM 40-225) the shroud and the muffler are supported with a brace attached between the
% shroud and the throttle cable boss.
3. Operation
Exhaust gases from the cylinders flows through the down-pipes to the muffler. The muffler takes some
of the energy from the gases. The gases then flow out of the muffler under the rear-right-side of the
engine.
The shroud on the muffler has two functions. It makes a heat exchanger to give heat for the cabin
heating system and it makes a heat shield for the very hot muffler.
Cold air flows into the shroud through the front stub pipe. The cold air goes around the muffler and
gets hot. The hot air then flows out through the rear stub-pipe and into the cabin heating system.
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Exhaust DA 40 Series
AMM
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20 Sep 2007 78-00-00 Doc # 6.02.01
Rev. 5
Bolted Joint
for Heat-Exchanger
Shroud
Air Inlet to
　
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