[C38] Vibration

[Max Soto]

This is weird....
New shaft, new engine mounts, strut is ok, prop is ok, alignment is ok, I
don't know what could be wrong. For the last four years I considered the
vibe as normal....
Now you really got me thinking.......
Max

2009/7/8 Glenn Terry <Glenn.Terry at sun.com>

>  Smooth Moves #248 has always had a vibration that I thought was normal.  A
> few years ago I picked up a line someone left floating at a guest dock and
> it bent the shaft (I have the original 2 blade prop).  I had it hauled,
> shaft straightened, prop balanced and it was back to the way it always was.
>
> I just had it hauled last month at San Francisco Boatworks and when they
> did a routine check on the engine they found warn motor mounts.  They
> replaced all three mounts and realigned the shaft with the engine.  WHAT a
> difference!  smooooth.
>
> So while you are going through all this have someone knowledgeable check
> the engine mounts and alignment.
>
> Regards,
>
> G!enn
>
> Max Soto wrote:
>
> Kerry, I have the same prop and always had that vibration no matter how
> well aligned my engine is and prop is perfect.  I don't have a flexible
> coupling yet, and I think that will make a great improvement.  I have 1
> 1/4"  between the strut and the prop.  When I just bought the boat and
> moved to my slip the guy that cleaned the prop left a line on the water that
> no one else saw. It got caught by the prop, bent the strut and broke the
> shaft, so, I also had work done on the strut and Can't tell if there was a
> vibration before.
>
>  Max Soto
> C38 #198 ESTANCIA
> Puntarenas, Costa Rica
>
>
> 2009/7/8 <littlebreeze at comcast.net>
>
>>  I'm sorry, I should have mentioned that the prop is the factory fixed
>> two blade prop.
>>
>> Kerry
>> ----- Original Message -----
>> From: "Bob Porter" <hiawatha at localnet.com>
>> To: "Catalina 38 Listserve" <listserve at catalina38.org>
>> Sent: Wednesday, July 8, 2009 2:45:07 AM GMT -08:00 US/Canada Pacific
>> Subject: Re: [C38] Vibration
>>
>>  Is there anything that could have changed the balance of your prop. I
>> has a martec folding prop with a slight imbalance and it caused quite a
>> vibration, dependent on speed.
>>
>> Bob Porter
>>
>> ----- Original Message -----
>> *From:* littlebreeze at comcast.net
>> *To:* Listserve, Catalina <listserve at catalina38.org>
>> *Sent:* Wednesday, July 08, 2009 2:12 AM
>> *Subject:* [C38] Vibration
>>
>>  I recently had my boat in for a bottom job.  While there the strut was
>> found to be loose.  I had the strut repaired and now there is a vibration.
>> At first the vibration was so violent to broke the hose clamps on the
>> packing gland hose.  Then the engine was realigned and most the vibration
>> was gone.  The vibration which is left is still enough to vibrate the
>> steering pedestal.  When I bought the boat 5 years ago I brought it up the
>> coast on the motor and there wasn't a vibration and when I took to have the
>> bottom repaired there wasn't a vibration.  Now it is logical to believe that
>> the vibration was there you just couldn't feel it because the strut was
>> loose and now that it is rigid again you can feel the vibration.  The other
>> thing which is of concern is that the propeller is mounted within 1/4 inch
>> of the strut, but there is another Catalina 38 in the same yard and the
>> propeller is approximately 1 foot from the strut.  (of course is has been a
>> month and I did not measure the distance between the strut and the prop).  I
>> think there could be a correlation between the location of the prop/strut
>> and the vibration.
>>
>> So I have several questions.  First, for those of you who have had you
>> boats out of the water recently, what is the distance between your prop and
>> the strut.  Second, any Ideas on the vibration?  Third, I know some of you
>> have had to deal with vibrations in the past, what have you done to rectify
>> your problems?
>>
>> Kerry Grimes
>> Littlebreeze, 139
>> San Francisco
>>
>>
>>
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-- 
Max Soto
C38 #198 ESTANCIA
Puntarenas, Costa Rica
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