Topics

New gearboxes - painted or bare alloy?


Mike Longcor (SV Trilogy)
 

Hello everyone,

I'm ordering new gearboxes for the main furler and main outhaul. The units can be shipped with a bare alloy finish or with a 2 pot epoxy paint. I'm curious if anyone has advice one way or the other. The paint will provide protection but will undoubtly fail at some point. The aluminum alloy should self-passivate and not continually corrode/oxidize.

Any advice from experience? Any issues in running with bare alloy, besides initial appearance? I suppose it will look better than flaking paint in the long run.

Cheers,
Mike Longcor
SV Trilogy SM23
Opua, NZ


eric freedman
 

Hi,
What make gearboxes are you using and where are you getting them?
If you leave the gearboxes unprotected they will look terrible in a short time.
I was considering having my gearboxes sand blasted and powder coated.
Any thoughts on that.
Fair Winds,
Eric
SM 376 Kimberlite

On September 26, 2020 at 4:10 AM "Mike Longcor (SV Trilogy)" <svtrilogy53@...> wrote:

Hello everyone,

I'm ordering new gearboxes for the main furler and main outhaul. The units can be shipped with a bare alloy finish or with a 2 pot epoxy paint. I'm curious if anyone has advice one way or the other. The paint will provide protection but will undoubtly fail at some point. The aluminum alloy should self-passivate and not continually corrode/oxidize.

Any advice from experience? Any issues in running with bare alloy, besides initial appearance? I suppose it will look better than flaking paint in the long run.

Cheers,
Mike Longcor
SV Trilogy SM23
Opua, NZ

 


Mike Longcor (SV Trilogy)
 

Hi Eric,

I'm ordering them new from Bonfiglioli Transmission in Auckland. They are 70:1 reduction gearboxes (VF44 P1 70:1 P63 B14).

So from a cosmetic standpoint you recommend paint? Is there any other noticeable or problematic degradation?

Does anyone know how long the paint lasts?

Cheers,
Mike Longcor
SV Trilogy SM23
Opua, NZ


On Sat, Sep 26, 2020, 8:56 PM eric <kimberlite@...> wrote:
Hi,
What make gearboxes are you using and where are you getting them?
If you leave the gearboxes unprotected they will look terrible in a short time.
I was considering having my gearboxes sand blasted and powder coated.
Any thoughts on that.
Fair Winds,
Eric
SM 376 Kimberlite

On September 26, 2020 at 4:10 AM "Mike Longcor (SV Trilogy)" <svtrilogy53@...> wrote:

Hello everyone,

I'm ordering new gearboxes for the main furler and main outhaul. The units can be shipped with a bare alloy finish or with a 2 pot epoxy paint. I'm curious if anyone has advice one way or the other. The paint will provide protection but will undoubtly fail at some point. The aluminum alloy should self-passivate and not continually corrode/oxidize.

Any advice from experience? Any issues in running with bare alloy, besides initial appearance? I suppose it will look better than flaking paint in the long run.

Cheers,
Mike Longcor
SV Trilogy SM23
Opua, NZ

 


Mark McGovern
 

Mike,

I would choose the paint.  The gearboxes are likely made from cast aluminum which tends to oxidize much faster than extruded aluminum does.  It also gets that unsightly white, chalky, aluminum oxide powder on it, not a nice uniform oxide coating.

If you go with the bare aluminum you will need to clean it regularly to keep it looking nice.  If you go with paint, you won't need to do any real regular maintenance other than fresh water rinsing until the paint fails.  At which time you can remove the paint, re-paint it and begin the cycle again or leave it as bare aluminum for awhile, see what happens, and decide what to do from there.

Mark McGovern
SM #440 Cara
Deale, MD USA


Ian Park
 

Mike,
You may have to grind the fins off the mainsail furling gearbox to fit in the mast profile. So you’d need to paint over anyway.
I changed mine three years ago. I painted with an aluminium primer and top coated with a one pot paint that matched the mast/boom. It’s worked fine, and if it gets scruffy I can paint it again.
I would say that one of the gearboxes was filled with oil, the other with grease (there was a discussion on this) The oil dripped out (in small amounts) of the seal onto the deck, so I refilled it with grease instead. Don’t know when you last removed the boom gearbox, but I take mine off every two years now to keep the outhaul shaft easy to free.

Ian

Ocean Hobo SN96
On passage to North Wales


Bill Shaproski
 

I've ordered several sets of these gearboxes from Bonfiglioli and they all were delivered with no finish.  I finished them the same or similar way I would have finished an aluminum part at Boeing.  That means a thorough cleaning to remove grease from surfaces, a coat of Alodine, two coats of zinc chromate primer, and two coats of enamel.  Having said that the first two units external surfaces showed heavy deterioration after two years of sailing around the world in the South Pacific and Indian Oceans meaning they saw a lot of salt water spray.  The other two units were just installed so have no sea time yet.  On these last two units I skipped the Alodine.  

If the supplier is willing to finish them for you, I would recommend that you accept that as they can probably do a better job.  I would also recommend that you install a cover over the units to protect them from salt water spray as suggested by another thread regarding these gearboxes.  Even wrapping them in a plastic bag or shrunk wrap would be preferable to no protection in my opinion.  But  I'm no expert so check with the other thread on this topic.  

Regards
Bill Shaproski
Former Amel Owner 

On Sat, Sep 26, 2020 at 1:10 AM Mike Longcor (SV Trilogy) <svtrilogy53@...> wrote:
Hello everyone,

I'm ordering new gearboxes for the main furler and main outhaul. The units can be shipped with a bare alloy finish or with a 2 pot epoxy paint. I'm curious if anyone has advice one way or the other. The paint will provide protection but will undoubtly fail at some point. The aluminum alloy should self-passivate and not continually corrode/oxidize.

Any advice from experience? Any issues in running with bare alloy, besides initial appearance? I suppose it will look better than flaking paint in the long run.

Cheers,
Mike Longcor
SV Trilogy SM23
Opua, NZ



--
Bill Shaproski
Cell:  +1-206-375-2787


Bill Shaproski
 

I agree with Ian about removing the outhaul gearbox shaft regularly to keep it free.  However, I recommend once a year minimum.  I had to replace the outhaul gearbox after two years of ocean sailing and it was completely frozen.  I hired a local Amel specialist and it took us 6 hours to get it off.  We tried 3 different pullers and eventually had to use a grinder to cut the gearbox into small pieces.  Not a fun project.  I greased the shaft heavily.  There's no need to remove the gearbox completely, just remove the shaft which is held by a single nut and regrease it.  Should be 20 minute job.  
Regards,
Bill Shaproski
Former Amel Owner

On Sat, Sep 26, 2020 at 5:15 AM Ian Park <parkianj@...> wrote:
Mike,
You may have to grind the fins off the mainsail furling gearbox to fit in the mast profile. So you’d need to paint over anyway.
I changed mine three years ago. I painted with an aluminium primer and top coated with a one pot paint that matched the mast/boom.  It’s worked fine, and if it gets scruffy I can paint it again.
I would say that one of the gearboxes was filled with oil, the other with grease (there was a discussion on this) The oil dripped out (in small amounts) of the seal onto the deck,  so I refilled it with grease instead. Don’t know when you last removed the boom gearbox, but I take mine off every two years now to keep the outhaul shaft easy to free.

Ian

Ocean Hobo SN96
On passage to North Wales







--
Bill Shaproski
Cell:  +1-206-375-2787


Ian Park
 

Well done Bill. Hadn’t thought of the real simple job of removing just the shaft. It’s on the schedule now. Thank you!

Feel a bit like Homer! Doooh!!


eric freedman
 

Try looking for a compound in a metal can called https://www.amazon.com/Never-Seez-NSBT-8-Regular-Anti-Seize-Compound/dp/B000KZCU26

I put it on the drive shaft of the outhaul twice a year. It takes 10 minutes. Just put a long grade 10 bolt in the bottom screw and tap it with a small sledge hammer. It comes out with 2 or 3 gentle taps.

Fair Winds,
Eric
SM 376 Kimberlite

On September 26, 2020 at 3:32 PM Ian Park <parkianj@...> wrote:

Well done Bill. Hadn’t thought of the real simple job of removing just the shaft. It’s on the schedule now. Thank you!

Feel a bit like Homer! Doooh!!

 


eric freedman
 

I forgot to mention that I used a Dremel tool with a cutting blade to remove a few thousands of an inch from the key that is on the shaft.
I removed metal from the sides and the top.
Eric

On September 26, 2020 at 8:10 PM eric freedman <kimberlite@...> wrote:

Try looking for a compound in a metal can called https://www.amazon.com/Never-Seez-NSBT-8-Regular-Anti-Seize-Compound/dp/B000KZCU26

I put it on the drive shaft of the outhaul twice a year. It takes 10 minutes. Just put a long grade 10 bolt in the bottom screw and tap it with a small sledge hammer. It comes out with 2 or 3 gentle taps.

Fair Winds,
Eric
SM 376 Kimberlite

On September 26, 2020 at 3:32 PM Ian Park <parkianj@...> wrote:

Well done Bill. Hadn’t thought of the real simple job of removing just the shaft. It’s on the schedule now. Thank you!

Feel a bit like Homer! Doooh!!