[C320-list] New Engine Mounts

[Martin Raphael]

I have about 1700 hours.
----- Original Message ----- 
From: "Gates" <argates2nd at comcast.net>
To: <C320-List at Catalina320.com>
Sent: Wednesday, June 25, 2008 7:07 PM
Subject: Re: [C320-list] New Engine Mounts


> 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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