[C320-list] Severe vibration at 1000 RPMs after engine mount replacement

[Art Harden]

Sorry about that guys wrong email. To many boat conversations going on at one time. Lol

Art Harden
Catalina 320 “Tortuga” #243
937-477-5544

> On Dec 11, 2020, at 1:05 PM, Art Harden <artstree at aol.com> wrote:
> 
> If can reach it with dish soap, it makes  good lubricant and the just washes away. 
> 
> Art Harden
> Catalina 320 “Tortuga” #243
> 937-477-5544
> 
>> On Dec 11, 2020, at 12:56 PM, Paul Borghese <packetpaul at gmail.com> wrote:
>> 
>> Do you have the idle set to 1100?
>> 
>>> On Fri, Dec 11, 2020 at 11:34 AM Age Of Aquariums <dan at ageofaquariums.biz>
>>> wrote:
>>> 
>>> my perkins does the same thing , i don’t go below 1100
>>> 
>>>>>> On Dec 11, 2020, at 8:17 AM, Paul Borghese <packetpaul at gmail.com> wrote:
>>>>> 
>>>>> A boatyard replaced the engine mounts in my Cat 320 Perkins M30 engine.
>>> The
>>>> engine is noticeably smoother at all RPMs except one, 1000 RPMs.  At
>>>> exactly 1000 RPMs the harmonic vibration causes the engine to shake
>>>> violently.
>>>> 
>>>> The vibration occurs every time on every transmission setting ( neutral,
>>>> forward, reverse).
>>>> 
>>>> Any ideas as to the issue?  I have an uneducated theory. The yard used
>>>> off-brand engine mounts that were not tuned to the engine causing the
>>>> severe vibration.  Or maybe the bolts are not torqued to the correct
>>>> specification.
>>>> 
>>>> Thoughts?
>>>> 
>>>> 
>>>> Paul
>>> 
>>>