[C320-list] New Engine Mounts

[Kirk McCullough]

Ours shudders only at low RPM, so I shift then rev up quickly avoid this. It 
runs smoooooth in any other conditions. I was thinking going to the softer 
mounts,.. Thanks for the heads-up.

We have 2400 hours on our Perkins and it runs like a charm, i just have 
learned how to shift to avoid shuddering. No tocker valve issues that i know 
of. I do like the Perkins for realability and good performance.

Kirk
----- Original Message ----- 
From: "Martin Raphael" <mraphael at q.com>
To: <C320-List at Catalina320.com>
Sent: Wednesday, June 25, 2008 7:08 PM
Subject: Re: [C320-list] New Engine Mounts


>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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