[Rhodes22-list] Motor lift “bearings”?

[Mary Lou Troy]

Hi Olivier,
I'm trying to remember the details of exactly how the mount worked. We 
didn't pay it much attention though we may have added a stop at the 
bottom. I know the design kept evolving after we bought the boat in 1998 
and as the boat was a 1991, it may have been a design from a previous year.

I wonder how long that plastic had been fatigued and if that had 
something to do with your difficulties with the mount?  I don't remember 
a whole lot of difficulty raising and lowering the motor and I'm not the 
strongest or most athletic sort. In spite of that, I did most of the 
raising and lowering. it did take moving close to the mount and raising 
it hand over hand. I guess it would have been more problematic if we 
were not always sailing with two people but it almost always went 
quickly. It did sometime take a nudge on the top of the motor to get it 
going down.

Hope you find a quick fix and glad you are getting out a lot.

Mary Lou

On 6/28/2020 1:16 PM, Olivier Hecht wrote:
> Thanks Roger. That is a lot different and looks like an upgrade!  I wish
> I’d taken more pictures before leaving the boat at the yard again...I can
> do that the next time I’m there. Basically though, there are four round
> protrusions on the movable carriage in the mount at the four corners of
> that carriage. Those are the parts that fit inside the plastic bearings I’m
> trying to replace. BTW, those protrusions themselves look pretty work
> themselves so upgrading the carriage might be the best long-term idea.
> Raising and lowering the motor has always been very tough with this design.
> One of the many reasons I’m so hesitant to use the motor! Olivier
>
> On Sun, Jun 28, 2020 at 11:05 AM ROGER PIHLAJA <roger_pihlaja at msn.com>
> wrote:
>
>> Olivier,
>>
>> I’ve attached a close-up photo of the linear bearing on my GBI motor
>> mount.  Note that it doesn’t seem at all like yours.  My linear bearings
>> are T-shaped pieces of glass-filled PTFE that ride in 6061 T6 Aluminum
>> C-Channels.  This design of linear bearing has a huge bearing surface area,
>> so the wear rate is minimal.  The design is self flushing to keep abrasive
>> debris out of the bearing.  Plus, the bearings can be easily swapped out
>> W/O disassembling the whole motor mount when replacement is required after
>> many, many service hours.  I don’t know when GBI changed the design; but,
>> it might be helpful if you provided a few more photos of your motor mount.
>>
>> Also, it might be helpful if you make a few measurements of the
>> ID/OD/Length of your bearings.  They might be standard plastic pipe sizes
>> and easily sourced from Grainger, McMaster-Carr, or United States Plastics
>> Corp.
>>
>> Roger Pihlaja
>> S/V Dynamic Equilibrium
>>
>> [cid:image003.jpg at 01D64D3C.17C68130]
>>
>> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>> From: Olivier Hecht<mailto:oehecht at gmail.com>
>> Sent: Saturday, June 27, 2020 9:01 PM
>> To: The Rhodes 22 Email List<mailto:rhodes22-list at rhodes22.org>
>> Subject: [Rhodes22-list] Motor lift “bearings”?
>>
>> Did 50 miles on Fretless from 3 pm Friday to 6 pm today, with a nice break
>> at a marina from 7 pm to 8 am!
>>
>> An unpleasant part of the experience was dealing with the motor lift
>> getting crooked in the tracks because two of the four plastic “bearings”
>> the mount rides on were worn out/missing. See pics. I sent a note to Stan
>> but also wanted to ask here if anyone has replaced these. Any tips on
>> replacing them without dismounting the motor if that’s possible?  The side
>> tracks appear to come off and I was able to retrieve one of the bearings
>> that was loose in the track after parking the  it on its trailer. Getting
>> new ones in will probably be harder though...
>>
>> Thanks. Olivier
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