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%  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.
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Bolted Joint

for Heat-Exchanger
 Shroud

 

Look for Soot Marks
Figure 1: Exhaust Manifold and Muffler
Heat-Exchanger Shroud
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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.
Trouble  Possible Cause  Repair 
Exhaust gas fumes in the cabin.  Muffler cracked under the shroud.  Replace the muffler. 
More noise than usual.  Exhaust muffler/pipe cracked. Internal damage to muffler.  Look for signs of exhaust gas leaks. Replace damaged gaskets. Repair or replace cracked pipes. Replace muffler. 

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Maintenance Practices
1. General
The maintenance practices for the exhaust system tell you how to remove/install the components of the exhaust system. They also tell you how to do an inspection of the muffler.
WARNING:  MAKE SURE THAT THE EXHAUST SYSTEM IS COOL BEFORE YOU TOUCH IT. THE EXHAUST SYSTEM CAN BE VERY HOT, THIS CAN CAUSE INJURY TO PERSONS.
2. Remove/Install the Exhaust Muffler
A. Remove the Exhaust Muffler
Detail Steps/Work Items  Key Items/References 
WARNING: MAKE THE ENGINE IS SAFE BEFORE YOU DO ANY WORK ON THE EXHAUST SYSTEM. IF THE ENGINE STARTS THE PROPELLER CAN CAUSE INJURY OR DEATH. 
(1)  Make sure that the engine is safe: S The ignition switch is set to OFF. S The ALT/BAT switch is set to OFF. S The throttle is set to IDLE. S The mixture control is set to LEAN CUT-OFF. 
(2)  Remove the engine cowlings.  Refer to Section 71-10. 
(3)  Release the worm drive clamp that holds the flexible hose to the front stub-pipe of the muffler. Move the flexible hose clear of the muffler. 
(4)  Release the worm drive clamp that holds the flexible hose to the rear stub-pipe of the muffler. Move the flexible hose clear of the muffler. 
(5)  Remove the lower of the two expansion-joints: S Remove the four nuts, washers and bolts which hold the expansion-joint-halves. S Move the expansion joint halves clear of the airplane.  Do this step for each of the cylinders. Hold the muffler! 

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Detail Steps/Work Items  Key Items/References 
(6)  If necessary, remove the second expansion-joint.  For easier maintenance. 
(7)  Lower the exhaust muffler clear of the airplane. 

B. Install the Exhaust Muffler
Detail Steps/Work Items  Key Items/References 
(1)  Examine the muffler. Make sure that: S The muffler is not cracked. S The shroud is located correctly. S The muffler is clean. 
　
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