[C320-list] New Engine Mounts

[Martin Raphael]

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
>
>