[C320-list] noise at 1800

[Rod Boer]

Jim,

I had a similar problem after I had my blade repaired from an encounter with
a crab pot line.  I read up on it and determined that it was from the
tailing edge of the blade.  I used a file to change the angle of the
trailing edge to what was recommended and it went away for the first year
but it is back.  Mine is around 2200 RPM.  I will redress the trailing edge
again this year. . . if I remember to during winter lay-up which is
unlikely.

Rod Boer, Odyssey #688

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of jim brown
Sent: Monday, September 02, 2013 7:01 PM
To: C320-List at Catalina320.com
Subject: [C320-list] noise at 1800

Had the boat hauled while we were on vacation for a week to have the bottom
cleaned and repainted. While it was out I had the two blade prop changed to
a three blade (my wife is at the helm and wanted more reverse power-I know
it's slower-she doesn't care), the cutlass bearing replaced (10 years on the
original) and the stuffing gland redone with Gortex packing. When taking the
boat back to our marina we noticed a high pitched screeching sound only at
1800 to 2200 rpm. Go below 1800 and above 2200 and no vibration and quiet.
No noise at the dock in neutral throughout the rpm range. Can't really
locate the noise except it doesn't seem to be coming from the transmission
or the packing gland (and that is cool after half hour of motoring), and it
seems a little louder in the aft lazarette.   Any suggestions? Is there an
upper bearing in the stuffing box that might need attention?

Jim Brown  Desafinado 973



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