[C320-list] Transmission or prop noise

[jim brown]

I agree. Had a similar problem. If you the sound is much louder in the aft 
lockers (listen through the aft cabin) the sound is from the prop. Thought it 
might be the cutlass bearing but filing down the sharp edges of my 2 blade prop 
completely eliminated the problem. 


Jim Brown





________________________________
From: Jeff Hare <catalina at thehares.com>
To: C320-List at Catalina320.com
Sent: Mon, October 25, 2010 8:01:51 AM
Subject: Re: [C320-list] Transmission or prop noise


I'd suspect the prop leading edges still.  I *think* they should be 
blunt/rounded or flattened and *not* filed to a fine edge but others will 
correct me if I'm wrong here. 


The cones don't slip once engaged, so unless its bearings in the transmission 
that's not where I'd look. 


If you can only duplicate it under way in forward I'd suspect the prop. 


------Original Message------
From: Chuck and Kathy Mueller
Sender: c320-list-bounces at lists.catalina320.com
To: c320-list at lists.catalina320.com
ReplyTo: C320-List at Catalina320.com
Subject: [C320-list] Transmission or prop noise
Sent: Oct 24, 2010 4:31 PM

This year, I developed a noise in the drive train.  It's a high pitched noise at 
most engine rpm's, but it goes away at low speeds and at high speeds.  I'm 
hearing it in forward at about 1500- 2800 rpm, when motoring.  I can't duplicate 
the noise if Irun the engine up in gear when tied to the dock.  I've checked 
alignment and it is very good.  I thought that this might be prop harmonics from 
my three blade fixed prop as I cleaned the prop last spring, but I don't really 
have any rounded trailing edges per the post a few months ago.  A neighbor told 
me that the Yanmar (Kanzaki) transmissions can do this due to wear of the 
cones.  Anyone have any experience with transmission noises?
Chuck Mueller
C320 - 2000
Northwind #676