remedial engine question

[David Harmon]

Hi Brian...the shaft actually had a 'shoulder' on it where the bearing
inner race had ground it down to a smaller OD than the shaft OD forward
of the bearing.
I guess the screech was caused by the bearing inner race rotating on the
shaft when the bearing locked up.
The engine had been in use for some time and the bearing that went bad
was the third one in use. 

Regards

Dave Harmon
NSRCA 586
K6XYZ at comcast.net
Torrance, Ca.

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Brian Young
Sent: Monday, August 25, 2003 12:06 PM
To: discussion at nsrca.org
Subject: RE: remedial engine question

Wonder if the crank was undersized on the engine to
begin with? 

I have seen a similar problem with another product
when the press to the bearing isnt adequate.


--- David Harmon <K6XYZ at comcast.net> wrote:
> This same thing happened to me with a 140-L.
> The engine would screech occasionally and there was
> an rpm loss so I
> knew something was binding up.
> Turned out to be the rear bearing locking up and the
> inner bearing race
> was skidding on the shaft. The shaft had to be
> replaced because the
> bearing race wore the shaft OD so small that a new
> bearing would wobble
> when I reassembled it. The old bearing felt and
> looked new.
> This happened really fast too, so don't run you
> engine until you replace
> the bearings and inspect the shaft.
> 
> Regards
> 
> Dave Harmon
> NSRCA 586
> K6XYZ at comcast.net
> Torrance, Ca.
> 
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]
> On Behalf Of Anthony Romano
> Sent: Monday, August 25, 2003 7:54 AM
> To: discussion at nsrca.org
> Subject: remedial engine question
> 
> Hi all,
> Have an RX with about thirty flights. The second day
> out I noticed a
> squeak 
> when turning the prop for restart. Thought something
> was hitting the 
> spinner, checked all that and it stopped. Yesterday
> heard it again and 
> noticed the bearings feel a little rough. Now hear
> is the weird part
> does 
> this only when hot. When cold feels fine and runs
> great. I plan on
> pulling 
> it apart tonight and changing bearings but pretty
> disappointed at the
> short 
> life.
> 
> Any one have similar experience?
> 
> Anthony
> 
>
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=====
Brian Young
Tulsa
b4598070 at yahoo.com
918-745-6046h
918-838-0900w

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