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
DA 40 Series AMM
DA 40 F
Section 78-02 is added:
Section 78-02 Exhaust - Lycoming O-360-A4M 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
DA 40 F
CHAPTER 78 EXHAUST
The title of Section 78-00 is amended to read:
Section 78-00 % Exhaust - Lycoming IO-360-M1A Engine
1. General
The first sentence is amended to read:
% The DA 40 with the Lycoming IO-360-M1A engine has a single exhaust system.
DA 40 Series AMM
DA 40 F
DA 40 F
Section 78-02
Exhaust - Lycoming O-360-A4M Engine
1. General
The DA 40 with the Lycoming O-360-A4M 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.
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.
DA 40 Series AMM
DA 40 F AIRCRAFT
Figure 1: Exhaust Manifold and Muffler
DA 40 F
Trouble-Shooting
1. General
The table below lists the defects you could have with the exhaust system. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
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