[C320-list] New Engine Mounts

[Gates]

Martin,
How many hours on your Perkins?  Rollie #182
----- Original Message ----- 
From: "Martin Raphael" <mraphael at q.com>
To: <C320-List at Catalina320.com>
Sent: Wednesday, June 25, 2008 8:55 PM
Subject: Re: [C320-list] New Engine Mounts


>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
> ----- Original Message ----- 
> From: "Martin Raphael" <mraphael at q.com>
> To: <C320-List at Catalina320.com>
> Sent: Sunday, June 01, 2008 7:16 PM
> Subject: Re: [C320-list] New Engine Mounts
>
>
>> Just a thought here...the engine will vibrate the same way in relation to 
>> RPM whether you have old or new engine mounts, wouldn't it?  Engine 
>> mounts will affect how that vibration is transmitted to the hull, and 
>> thus what we hear or feel.  Stiffer mounts will transmit more directly to 
>> the hull...softer mounts will absorb vibration.  So I wonder if Mike's 
>> new mounts were actually "softer" than the worn mounts he replaced.  I 
>> say this because some years ago (2003) I had new engine mounts installed, 
>> and the engine noise and vibration, especially at low RPMs, went up 
>> tremendously.  I have always thought this was because the new engine 
>> mounts were much stiffer than the originals.  Other thoughts?
>> Martin Raphael
>> Rhapsody #108
>> ----- Original Message ----- 
>> From: "Kirk McCullough" <kirk.mccullough at telus.net>
>> To: <C320-List at Catalina320.com>
>> Sent: Wednesday, May 28, 2008 9:18 AM
>> Subject: Re: [C320-list] New Engine Mounts
>>
>>
>>> Mike
>>>
>>> Good advice, I'll add new mounts to the list. I have always put up with 
>>> the "Perkins shudder" at low RPM, made even a little worse with the high 
>>> pitched Kiwi prop when in reverse.
>>>
>>> Kirk
>>> #124
>>> ----- Original Message ----- 
>>> From: "Mike Shoffner" <drshoffner at yahoo.com>
>>> To: <c320-list at lists.catalina320.com>
>>> Sent: Sunday, May 25, 2008 6:08 PM
>>> Subject: [C320-list] New Engine Mounts
>>>
>>>
>>> Over the years there have been threads devoted to the vibrations at low 
>>> RPM's of the older boats with Perkins engines. I've noted this with my 
>>> boat ever since I boughtit 4 years ago, and I've just attributed it to 
>>> being a characteristic of the Perkins engine. Recently, because of my 
>>> cutless bearing wearing out in one season of use, I had my shaft 
>>> allignment checked and was advised I needed new engine mounts. What a 
>>> difference!! The old "Perkins vibrations" apparently were due to worn 
>>> engine mounts' and with new mounts there are zero vibrations at low 
>>> RPM's. At higher RPM's engine noise and vibrations are also noticably 
>>> reduced as well. Mine is a '94 model and probably needed new mounts for 
>>> several years. I would advise owhners of more mature boats to consider 
>>> having their engine mounts replaced if they're having problems similar 
>>> to mine.
>>> Regards,
>>> Mike
>>> #171
>>>
>>>
>>>
>>>
>>>
>>> -- 
>>> No virus found in this incoming message.
>>> Checked by AVG.
>>> Version: 7.5.524 / Virus Database: 269.24.1/1469 - Release Date: 
>>> 5/27/2008 1:25 PM
>>>
>>>
>>>
>>
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