[C38] Vibration

[Glenn Terry]

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 <mailto: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
>     <mailto:hiawatha at localnet.com>>
>     To: "Catalina 38 Listserve" <listserve at catalina38.org
>     <mailto: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
>         <mailto:littlebreeze at comcast.net>
>         *To:* Listserve, Catalina <mailto: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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