Internal rattle sound

by garfield langille in 912 / 914 Technical Questions 2 years ago

My 912 UL had not been run for 4 months and was
great the last time. Yesterday when my chinook was
being lowered from wheels onto the FullLotus floats,
heard a kind of a rattle noise from inside the engine.
THere are no loose wires or anything outside that could
make such a noise. When giving the plane a little jiggle,
there is a kind of a pendulum sort of metallic rattle
sound that lasts about 2 or 3 seconds. Has anyone ever
heard anything like that? Have not started the engine
yet, will it blow up? What could that noise possibly
be?

Re: Internal rattle sound

by garfield langille » 2 years ago

garfield langille

3 6 2

Re my rattle, using a stethoscope, the rattle turns out to be from inside the muffler, seems that there is a bit of material loose inside it.

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Re: Internal rattle sound

by Roger Lee » 2 years ago

Roger Lee

131 5.38k 5.44k

Once in a while a baffle inside the muffler can break lose. Time for a new muffler.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Internal rattle sound

by Jeffry Stetson » 2 years ago

Jeffry Stetson

6 105 367

garfield langille wrote:

Re my rattle, using a stethoscope, the rattle turns out to be from inside the muffler, seems that there is a bit of material loose inside it.

Good catch! That could cause a sudden random blockage of exhaust flow resulting in loss of power and engine damage. It pays to be attentive to little things and take time to investigate them.

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