[C320-list] Vibrations at certain RPM Range
kskis at aol.com
kskis at aol.com
Mon Aug 12 06:11:08 PDT 2019
Please reach out to me directly to "discuss": kskis at aol.com Thanks. Neil
-----Original Message-----
From: sail-ability <sail-ability at sympatico.ca>
To: C320-List <C320-List at catalina320.com>
Sent: Mon, Aug 12, 2019 9:03 am
Subject: Re: [C320-list] Vibrations at certain RPM Range
I have one. What are U willing to pay+shipping.
JohnM
1999#574
Sent from my iPhone
> On Aug 12, 2019, at 8:34 AM, kskis at aol.com wrote:
>
> As I responded recently, my "whining" or "singing" between 1800 and 2500 rpms in forward gear only, could be a prop issue. I have read that some prop people are familiar with creating an "anti singing edge-a chamfering of the trailing edge, typically on the suction side..." (ref:HydroComp, Inc.). If a prop issue, this could be determined by replacing the prop with a "working" 3-blade prop from another C320. Wondering if anyone can direct me to a fixed 3-blade 9x15RH prop for sale? Or any other suggestion? Thanks. Neil Kornblatt Harmony #973
>
>
> -----Original Message-----
> From: John Meyers <jcmeyers7 at gmail.com>
> To: C320-List <C320-List at catalina320.com>
> Sent: Tue, Aug 6, 2019 10:38 am
> Subject: [C320-list] Vibrations at certain RPM Range
>
> Starting about 3 weeks ago the boat is making a loud racket when the engine
> is revving between 1500 and 2000 rpm. mostly in the rear of the boat but I
> cannot pinpoint the source. This occurs both in gear and in neutral so not
> suspecting shaft alignment. I suspect that it is some harmonic thing. All
> motor mounts look good and solid and well attached with over a quarter inch
> between the metal parts. I have check both feeling and/or removed just
> about every thing in the lockers like spare prop, spare anchor, propane
> tank, and other items that might be shaking while the noise is occurring. I
> have felt the fuel tank and engine and nothing feels different than when
> the noise is not noticeable. I have even gone below the boat and felt the
> shaft prop cutlass, rudder and all seem solid. The shaft and cutlass
> bearing were replaced a couple years ago. I have checked the steering
> mechanism.
>
> To explain the noise/clatter it sounds like a loose hatch, door, or
> equipment is shaking.
>
> At low revs and higher revs the noise is not there.
>
> Has anyone ever had this problem or know someone that has/had this problem?
>
> Thanks for all your help in past, present, and future. I rely on the
> questions and answers this list provides.
>
> John Meyers
> Wind Chime 1997 #406
> Muskegon, MI
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