Screeching sound on a YS140

[David Harmon]

Yep..I had this very thing happen to me.
 
The rear bearing is bad and under certain conditions inside the engine,
the inner race will rotate on the shaft causing a screeching sound.
Mine did not do it all the time so it didn't get fixed right away.
Finally I started it up and let it idle for awhile and when it started
screeching the idle rpm went down quite a bit.
Obviously, something was binding up.
Upon disassembly, I found that the inner race of the rear bearing had
ground down the O. D. of the shaft.
I had to buy a new shaft as well as bearings.
Don't continue to run it or the shaft will be damaged.
 
 
Regards

Dave Harmon
NSRCA 586
K6XYZ[at]comcast[dot]net
Torrance, Ca. 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Gabriel Gonzalez
Sent: Monday, January 19, 2004 3:56 PM
To: discussion at nsrca.org
Subject: Screeching sound on a YS140
 
Hi All,
 
I was flying my quest yesterday, and when I landed I heard a loud
irregular screeching sound.
This is my 1st YS engine and have been flying it for a couple of months
now.
At first I thought the cowl came loose and was touching the spinner
backplate, but when I taxied and stopped the engine at my feet to check
it nothing was touching the engine, not even close. It was a high
picthed noise.
I shut it down, and thinking it could be a bearing I tried turning the
propeller by hand and everything felt smooth.
Anybody with experience with these engines can share their ideas as to
what could this be?
I'd like to know what to look for before I start disassembling it.
 
Thanks,
 
Gabriel
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