INSTALLATION MANUAL
AIRCRAFT ENGINES
page 10 - 2
Initial issue, May 01/99
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
d00320
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ATTENTION: Vibration due to improper suspension is by far the most common
reason for damage to the exhaust system.
▲
WARNING:
Don’t use any sharp tool for removal of the tension spring for reason
of possible damage of spring wire. A hook bent out of a 5 mm Ø bar
is the most suitable tool.
◆
NOTE:
Ensure that exhaust system is properly supported and maintained.
10.2)
After-muffler system:
For noise reduction at the tail pipe, an after-muffler can be fitted. This
after-muffler will only slightly affect engine performance and can be
clamped to tail pipe of muffler.
At the installation of the after-muffler (1) in final position,
drill the two 5,7 mm Ø holes in the bend and muffler
end-pipe, for securing pin (5). The outer situ-
ated holes (2) have
been already machined
on the serial production
line. Remove accumulated chips
from the exhaust system.
To ensure lasting fixed position of the after-
muffler during engine operation, the connections of
muffler (3) to bend (4) and after-muffler (1) are to be
secured against twisting by the securing pin (5).
Fit clamp (6) in the specific position that the Allen screw (7)
prevents the securing pin (5) from dropping out.
10.3) Exhaust gas temperature (EGT):
Exhaust gas temperature will give the most rapid response in the event of improper
mixture, pre-ignition or detonation. Ideally the exhaust temperature should be meas-
ured about 100 mm (4 in.) from the piston, with separate sensors for each cylinder.
EGT (max.) = 650 ° (1200 °F)
fig. 9
02796
fig. 10
fig. 11
02797
02798
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ATTENTION: The exhaust manifold is pro-
vided with tapped holes. If the
EGT is not measured the
holes must be closed with
screws which must be
safety-wired.
Summary of Contents for 447 UL SCDI
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