[C320-list] Motor mounts

[John Beck]

Hey Bruce you ever have a whistle from what seems like the shaft but sounds
like an alternator  between 2400 and 2800 rpm’s

Jb
Sail On 518

On Sun, Nov 5, 2023 at 10:00 AM Bruce Heyman via C320-list <
c320-list at lists.catalina320.com> wrote:

> Hi Dave,
> My experience has always been that when you have specific rpm's that
> results in resonance it is either due to shaft whip or misalignment of the
> shaft.  In the past when I've had that problem it would go away when I
> aligned the shaft.  Also, my experience is that when a motor mount fails
> you have very serious shaft misalignment and when you look at the motor
> mount you will see the rubber is detached from the metal.
> Bruce
> Bruce Heyman
> Somerset #671   San Pedro (LA) California
>
> -----Original Message-----
> From: C320-list <c320-list-bounces at lists.catalina320.com> On Behalf Of
> Dave Hupe via C320-list
> Sent: Sunday, November 5, 2023 6:48 AM
> To: C320-List at Catalina320.com
> Cc: Dave Hupe <hoopdtwo at yahoo.com>
> Subject: Re: [C320-list] Motor mounts
>
> I have the Perkins M30 engine in my 1994 #32.  I have vibration that I
> don't like at certain rpms and the engine does not like idling too low. I
> have examined my motor mounts and manually jiggled theengine as hard as I
> can, but don't  see/detect anything that says I should replace my mounts. I
> have learned to throttle up/down to get a smooth motor cruise for different
> speeds desired and an easily get 6 knots without pushing the engine hard. I
> don't like the idle speed my motor wants when it comes to shifting between
> gears without the motor shuttering. Shifting sounds harder than i like but
> it works.
> NOTE everyone .... I suggest mention your specific engines when doing
> posts like this.  Specifics helps each of us know the applicability of your
> information to our own situations.
> Dave Hupe
> 1994 C320 #32
> Holland, MI
>
>