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 Gap between the Masthead Sheaves		  New Topic  Topic Locked
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Ed Cassidy
Captain

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USA
365 Posts
Initially Posted - 06/21/2010 :  06:35:01  Show Profile
I'm replacing the masthead sheaves but they are not wide enough and leave a gap that the wire could easily fit in. Is there supposed to be some sort of washer between the sheaves to prevent that? The ones I removed were two different widths but one of them looked to be something someone picked up at a hardware store. It only has a diameter of 1.45 inches but it was .60 wide. The regular sheave is a 2" diameter and .40 wide. Doing the math, if I use the two regular sheaves, I'll have a .20 inch gap between them. Any ideas?

Ed
HisHorse
1979 SR/SK #1393
Green Cove Springs, FL
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 06/21/2010 :  07:08:55  Show Profile
I wonder if the sheave was replaced with a wider one to accomodate a change from wire to rope halyard. Be sure to replace them with sheaves of sufficient size to properly accomodate the lines running through them.

As for the gap, I'd use nylon washers to limit corrosion.
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 06/21/2010 :  08:53:17  Show Profile  Visit JimB517's Homepage
There is a little plate that fits between the sheaves. I dropped mine overboard when replacing the sheaves. Available from Catalina Direct.
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redeye
Master Marine Consultant

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3476 Posts
Response Posted - 06/21/2010 :  08:58:15  Show Profile
You believe you can see it in the picture on the "everything look good on my masthead post?" on this forum from last week.
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Ed Cassidy
Captain

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USA
365 Posts
Response Posted - 06/21/2010 :  10:47:20  Show Profile
Very good! I see what it is now and it makes sense. The wire can't possibly jump over that.
Ed
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 06/21/2010 :  12:47:37  Show Profile
If you are replacing sheaves, I highly recommend that you consider changing to all rope halyards. Even with the divider plate in place, a wire halyard can jump a sheave and get stuck. Not good when the main is half way hoisted (don't ask me how I know this!)
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 06/21/2010 :  15:45:53  Show Profile  Visit Leon Sisson's Homepage
Yep, a wire halyard can cross over the metal partition in the masthead fitting. Another vote for all rope, internal halyards.

-- Leon Sisson
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 06/21/2010 :  16:20:52  Show Profile
My wire halyard did not cross over the partition, it wedged in between the partition and the sheave, too much slack in the halyard while raising the main.
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Ed Cassidy
Captain

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USA
365 Posts
Response Posted - 06/21/2010 :  16:32:22  Show Profile
I made my own partition out of aluminum plate and shaped it so that the wire can't possibly cross over. It extends up into the opening at the top of the masthead and fits all the way to the masthead and the plate was sized to leave no room for the wire to slip between the plate and the sheave.I will (in the future) move to internal rope but not quite yet. Actually. I believe that the two sheaves that were .60 inches wide were for rope halyards. I wonder if I can sell my redesign to Catalina? Anyway, I was doing some long needed maintenance which included replacing the anchor light and steaming light, adding a deck light and replacing the mast wiring and deck connector and part of it was the sheaves.
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limey156
1st Mate

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89 Posts
Response Posted - 06/21/2010 :  17:44:21  Show Profile
You are welcome for the pics gents :) glad they were of service.
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Stinkpotter
Master Marine Consultant

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Djibouti
9076 Posts
Response Posted - 06/21/2010 :  21:19:39  Show Profile
Another vote for all rope (low stretch), which in turn means different sheaves. 5/16' is common, and CD has the sheaves for that. Mine weren't internal--not as elegant, but fully adequate. I made the change when I was setting up to lead the main halyard back to the cockpit--also a nice upgrade.
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redeye
Master Marine Consultant

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3476 Posts
Response Posted - 06/22/2010 :  03:43:16  Show Profile
I try to post a lot of images as I'm a photog and it's easy for me. I feel embarassed you think I'm blowin my horn, but some will see something that helps them, and me. I'm hoping to get the mast worked over this year, so I'm also following any mast threads. Following and trying to wait for a good LED external lighting solution.

It is fun to see Ed's work, a mechanic I believe. Talk about a get her done attitude and capability. Inspires me.

Ain't no gap up there now....
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Steve Milby
Past Commodore

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USA
5895 Posts
Response Posted - 06/22/2010 :  08:40:42  Show Profile
After my wire halyard jumped the sheave, I bought a plastic "For Sale" sign at Wal-Mart and cut a couple of disks the same size as the sheave, and put the disks between the sheaves, to take up the space. I never had a repeat of the problem.
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limey156
1st Mate

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89 Posts
Response Posted - 06/22/2010 :  09:01:31  Show Profile
Yeah redeye pictures are great. I figured posting them would be helpful as not many people have an up close visual of what is up there. I am learning a ton with mah new boat, went for a cruise Sunday and used the dinghy to go ashore for the 1st time. Good fun.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.