[C320-list] New Engine Mounts

[hcreech at comcast.net]

I may be missing something here, but I too experienced vibration at low throttle.  I finally adjusted the throttle linkage just slightly so that the engine could not obtain that speed and, just that simple, no more vibration.

Sincerely,
Herb Creech
Cloud Chaser #606

 -------------- Original message ----------------------
From: "Martin Raphael" <mraphael at q.com>
> Warren, the vibration is only at the very lowest RPM.  I find that the 
> slightest acceleration is enough to reduce any vibration to essentially nil. 
> I did have the valves checked and there is some wear on the rocker arm but 
> not enough to cause problems as yet.  I have since run the engine under way 
> in gear and there are no noisy vibrations any longer...it is only at the 
> very slowest RPM in gear.  So I'll just avoid that idle RPM except for the 
> brief moment it takes to shift gears.  So, like you, I will just avoid the 
> slowest RPM from here on out.  The new motor mounts resulted in a greatly 
> quieter engine.
> Martin Raphael
> Rhapsody #108
> ----- Original Message ----- 
> From: "warren updike" <wupdike at hotmail.com>
> To: <c320-list at lists.catalina320.com>
> Sent: Sunday, June 29, 2008 7:06 PM
> Subject: Re: [C320-list] New Engine Mounts
> 
> 
> > Martin, I too have the M30, and it vibrates to beat the band below 1k rpm.
> > The diesel mechanic from whom I took a maintenance course said that's 
> > common
> > with the small diesel engines. His advice was to not run it where it
> > vibrates. I've even thought of adjusting the cable so it won't go below 
> > 1K.
> >
> > You didn't say if the vibration was only at very low rpms. Of course, if 
> > you
> > have that kind of vibration above 1200 rpm I would think that indicates a
> > problem to be addressed.
> >
> > In spite of my low rpm vibration, above 1k the engine runs like a dream. 
> > I
> > like to cruise at 2700-2800 rpm and do so for hours when necessary with no
> > problems.
> >
> > I'm interested in the outcome and would appreciate your letting me know 
> > how
> > it is resolved.
> >
> >
> > Warren & Pattie Updke
> > Catalina 320, #62, "Warr De Mar"
> > Middle River, Chesapeake Bay
> >
> >
> >
> >
> > -----Original Message-----
> > I just replaced my non-stock engine mounts with the stock Perkins mounts 
> > per
> > the thread below.  To my great distress, the engine now vibrates wildly, 
> > to
> > the point that the shaft bounces against the shaft tunnel when in gear.  I
> > had hoped that the softer stock mounts would solve a long-lasting 
> > vibration
> > and noise issue I have been experiencing.  Now my mechanic says the real
> > culprit may be in the valves and they will be checking that out tomorrow.
> > He says he has encountered 2 other Perkins that have serious valve rocker
> > wear, and that this can cause the vibration.  Have any of you heard of 
> > this
> > problem or experienced it yourselves?  Right now I'm feeling rather 
> > foolish
> > for having invested a huge amount of money in new mounts when those may 
> > not
> > have been the culprit.  BTW, mine is a 94 Perkins M30.  So let this be a
> > caution before blindly switching out motor mounts.  I may have to just go
> > back to the old mounts and live with the annoying but tolerable vibration.
> > Martin Raphael
> > Rhapsody #108
> >
> > 
>