[C320-list] New shaft

[christopher Brearley]

Hi Jerry,

I have recently replaced my engine mounts with genuine Yanmah product and there 
is still the vibration when reducing RPM. Cutless bearing is also fine, so I am unsure
of what is causing it. Reduce RPM slowly?

Chris,

WeaRitz@ 
#374


On 17/06/2014, at 10:19 PM, jsheets at aol.com wrote:

> Thanks all for the responses/advice. I suspect I will be adding motor mounts to my project list. 
> 
> Jerry 
> JellyRoll  #890
> 
>> On Jun 16, 2014, at 5:35 PM, Jim Brown <jbrown5093 at gmail.com> wrote:
>> 
>> You can check if the vibration is in the motor mounts pretty easily.
>> Uncover the engine and (watch out for the belts and pulleys) put a longish
>> pry bar or big screw driver in the motor mount. Pull up hard. You'll be
>> surprised about how much they raise up. With the motor mount stressed
>> throttle up and if it is a mount the vibration should be gone or much
>> better. Do each mount individually. Mine (2004) are very weak and when
>> throttling down to idle it sounds like a bucket of bolts just above idle
>> speed when there is significant vibration. With the mounts stressed-no
>> noise at all. Getting ready to replace them . I believe that yanmar
>> recommends replacement every 4-5 years (I suspect nobody does that).
>> 
>> Jim Brown
>> 
>> 
>>> On Mon, Jun 16, 2014 at 4:35 PM, <jsheets at aol.com> wrote:
>>> 
>>> Probably around 800 - 1000.
>>> 
>>> Jerry
>>> 
>>>> On Jun 16, 2014, at 3:11 PM, <tharrison at innovations-plus.com> wrote:
>>>> 
>>>> Just wondering what is you starting RPM"s
>>>> 
>>>> Ted - hull 424
>>>> 
>>>> -----Original Message-----
>>>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
>>> Behalf
>>>> Of Andrew Santangelo
>>>> Sent: June-16-14 2:30 PM
>>>> To: C320-List at Catalina320.com
>>>> Subject: Re: [C320-list] New shaft
>>>> 
>>>> Jerry,
>>>> 
>>>> It could be related tot he cutlass bearing.  I have had this replaced 3
>>>> times over the last 18 years on Dawn Treader.  I also had a drive saver
>>>> installed for the Autoprop and it saves on wear and tear with the engine.
>>>> 
>>>> Andrew Santangelo
>>>> 
>>>> C320 "Dawn Treader"
>>>> #333
>>>> Holland, MI
>>>> 
>>>> J22 "Blitzkrieg"
>>>> Elephant Butte, New Mexico
>>>> 
>>>> 
>>>> 
>>>> 
>>>>> On Jun 16, 2014, at 2:26 PM, jsheets at aol.com wrote:
>>>>> 
>>>>> I recently had a new prop shaft installed due to some previous problems
>>>> with the old shaft. Since installed, on two occasions I have had a strong
>>>> vibration of the shaft and transmission when starting out at low speeds.
>>>> Once given more throttle it works itself out. Does not do it when slowing
>>>> down from higher speed, only in early acceleration. Mechanic is convinced
>>>> the alignment is correct. Says he thinks part of the problem is the motor
>>>> mounts Yanmar uses, allowing for too much movement of the motor. Any
>>>> thoughts or similar experience anyone can share is appreciated.
>>>>> 
>>>>> Jerry
>>>>> 
>>>>> JellyRoll  #890
>>>