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heat exchanger.
Refer to Chapter 21-00 for more data on the heat exchanger.
The Teledyne Continental IO-240-B engine installed in the DA20-C1 has an exhaust system
supplied by the airplane manufacturer.
2. Description
Fabricated welded stainless-steel makes the exhaust system. Each of the engine cylinders has an
exhaust pipe. The top of each exhaust pipe attaches to the cylinder exhaust port. Expansion
brackets further down the exhaust pipes close the exhaust pipe bellows. The bellows let the
exhaust pipes move. And they let the exhaust pipes expand.
The pipes go underneath the engine where they go into the muffler/heat exchanger. The exhaust
outlet pipe attached to the bottom of the muffler/heat exchanger goes through the bottom of the
lower cowling. This ejects the exhaust gas outside the airplane. An Exhaust Gas Temperature
(EGT) probe attaches to the left aft exhaust pipe.
A metal shroud goes round the outside of the muffler. A row of screws along the top of the shroud
attach it to the muffler. The shroud has stub-pipes at the front right and back left. The space
between the muffler and the shroud makes the heat exchanger for the cabin warm air system.
Exhaust
DA20-C1 AMM
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Rev. 0
Figure 1: Exhaust
DA20-C1 AMM
Exhaust
Doc # DA201-C1
Rev. 9 78-00-00 Page 101
29 Apr 2004
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 in the
Repair column.
WARNING: MAKE SURE THE EXHAUST SYSTEM IS COOL BEFORE YOU TOUCH
IT. THE EXHAUST SYSTEM CAN BE HOT. THIS CAN CAUSE
INJURY TO PERSONS.
Trouble Possible Cause Repair
The exhaust system makes too
much noise.
A damaged muffler Replace the exhaust system.
Cracks in the exhaust pipe. Too much vibration. Replace the exhaust
system/weld the crack.
Exhaust gas leaks into the
cockpit.
Cracks in the muffler. Replace the exhaust system.
Indication on engine cowling of
exhaust gas leaks.
Defective exhaust pipe gaskets. Replace defective gaskets.
The nuts that attach the exhaust
pipes to cylinder head are
loose.
Torque to 22.6 - 23.7Nm
(16.7 - 17.5ft lbs).
Exhaust
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DA20-C1 AMM
Exhaust
Doc # DA201-C1
Rev. 0 78-00-00 Page 201
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MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove/install the engine exhaust system.
WARNING: MAKE SURE THE EXHAUST SYSTEM IS COOL BEFORE YOU TOUCH
IT. THE EXHAUST SYSTEM CAN BE HOT. THIS CAN CAUSE
INJURY TO PERSONS.
2. Remove/Install The Exhaust
A. Remove The Exhaust
Detail Steps/Work Items Key Items
WARNING: WARNING: DO NOT STAND WITHIN THE DANGER AREA OF THE
PROPELLER. IF YOU DO THIS, A DAMAGED COMPONENT CAN
CAUSE THE ENGINE TO START. THIS CAN CAUSE DEATH OR
INJURY TO PERSONS.
(1) Remove the engine cowlings. Refer to Chapter 71-10
(2) Disconnect the EGT probe from the left aft
exhaust pipe.
(3) Remove the two worm-drive clamps from the
heat exchanger shroud.
− Move the air intake flexible hoses clear
of the heat exchanger shroud.
− Move the warm air to the cabin heat
valve flexible pipe clear of the heat
exchanger shroud.
(4) Remove the exhaust system from the engine
exhaust cylinder ports.
− Remove and discard the eight nuts from
the cylinder head studs.
− Remove the eight spring washers.
Hold the exhaust system!
(5) Remove the exhaust system.
(6) Remove and discard the four exhaust pipe
gaskets from the cylinder heads.
Exhaust
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Rev. 9
B. Install The Exhaust
Detail Steps/Work Items Key Items
WARNING: WARNING: DO NOT STAND WITHIN THE DANGER AREA OF THE
PROPELLER. IF YOU DO THIS, A DAMAGED COMPONENT CAN
CAUSE THE ENGINE TO START. THIS CAN CAUSE DEATH OR
INJURY TO PERSONS.
WARNING: YOU MUST DO A THOROUGH EXAMINATION OF THE EXHAUST
MUFFLER. A DEFECTIVE MUFFLER WILL LET EXHAUST GAS
INTO THE COCKPIT. THIS CAN CAUSE DEATH OR INJURY TO
PERSONS.
WARNING: DO NOT USE THE NUTS THAT ATTACH THE EXHAUST PIPE
ONTO THE CYLINDER HEAD FLANGE AGAIN. MAKE SURE YOU
USE NEW NUTS EACH TIME.
(1) Assemble the exhaust pipes to the muffler.
− Leave the clamping nuts loose.
(2) Install four new gaskets to the cylinder head
　
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