CHAPTER 78
PAGE 4
MAINTENANCE MANUAL EXTRA 300LT
PAGE DATE: 7. July 2010
78-10-00 COLLECTOR/NOZZLE
Description
Each engine cylinder has a separate exhaust pipe routed
down merging in collector tubes with increasing diameter.
The collector tubes are equipped with heat shields to protect
the lower engine cowling against the heat. Several exhaust
pipes feature slip joints to allow for thermal expansion.
The left and right collector tubes are merged further aft in the
muffler under the engine. An end pipe protrudes from the
muffler through the lower engine cowling for exhaust gas
discharge to the atmosphere.
Operation
The exhaust pipes are of welded stainless steel. These pipes
are routed from the cylinders down to the muffler under the
engine. The muffler comprises an inner pipe, which is
perforated, and an outer pipe to form a welded, sealed
structure.
The muffler is cooled using a surrounding heat shroud, which
is fed with fresh air from the forward LH baffle which is then
discharged to the athmosphere or to the heating system.
Trouble Shooting
Trouble Possible Cause Remedy
Engine to loud Muffler defective Replace muffler per
Ch. 78-10-02.
Exhaust piping cracked Muffler not secured Reweld piping and tighten
clamps on muffler
Muffler too hot Check fresh air ducting
Cylinder outside sooted Gasket defective Replace gasket per
Ch. 78-10-03.
Exhaust flange bent Replace exhaust pipe per
Ch. 78-10-01.
Cowling inside damaged Heat shield defective Replace heat shield per
CH. 78-10-04.
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