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masthead sheave question

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Lightnup
Master Marine Consultant

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USA
1016 Posts

Initially Posted - 04/11/2006 : 23:41:07

Last time out, my jib was suddenly VERY difficult to furl and unfurl (Hood with continuous furling line). I had to yank really hard on the line. Well, turns out that the jib halyard (internal) separated at the top of the mast allowing the weight of the sail to settle on the furler drum which makes it quite difficult to turn. In fact, it shouldn't be turned under those circumstances.

Have a new halyard and a small wiry guy (which I'm not) willing to go up in the bosun's chair to thread it down the inside of the mast but I wanted him to install a new masthead sheave while he's up there. The old one being shot probably led to the halyard breaking. Catalina Direct's masthead sheaves are on back order so all I can do is wait.

Now, here's my question: What holds the masthead sheave on and what tool(s) will my friend need to take up with him to remove and replace?

Thanks,

Steve

Steve Madden
'87 WK #5668 "Lorica"
Fort Myers, FL

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SailormanCGA72
1st Mate

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77 Posts

Response Posted - 04/12/2006 : 08:56:54

If memory serves me, the sheaves are held by a 3/16" x 2" rivet which is secured by a 3/32" x 1.5" SS cotter pin. Your mast monkey will need a pair of needle nose pliers, and possibly a drift pin to knock the sheave pin out.

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 04/12/2006 : 09:35:27

3/16" seems a wee small. I think my clevis pins were 5/16".

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ClamBeach
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3072 Posts

Response Posted - 04/12/2006 : 09:50:29

Cant' do that... the sheaves are supporting the halyard that's holding you up there in the bosun's chair. (The jib and mainsail sheaves ride on a common axle).

I suppose you could make a trip up to the masthead and rig a seperate block and line... then come down, rig up with that line and go back up again.

Either way, I'd lower the mast rather than try and do that job up there. Quicker, easier, safer. Three reasonably robust guys can do this very easily.
(see thread archives for lots of commentary on this)

Remember that over water, gravity increases with the cube of the importance of the part to be dropped.

"Catalina Direct's masthead sheaves are on back order"

The ball bearing sheaves or the nylon ones? Unless they (CD) have changed things, the nylon ones don't fit well. Many of us purchased replacement sheaves from a little outfit called Belpat Marine. There are quite a few threads in the archives about this.

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Leon Sisson
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1893 Posts

Response Posted - 04/12/2006 : 09:51:17

I seem to recall the masthead sheeve axles being 3/8" diameter. Suggested tools would include needlenose pliers, small hammer, drift punch, spray penetrant, strength, stamina, patience, and at least 3 hands.

-- Leon Sisson

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 04/12/2006 : 10:32:37

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by ClamBeach
 Cant' do that... the sheaves are supporting the halyard that's holding you up there in the bosun's chair. (The jib and mainsail sheaves ride on a common axle).
<hr height="1" noshade id="quote"></blockquote id="quote">

"Well, turns out that the jib halyard (internal) separated at the top of the mast..."

If he's running internal halyards, the sheaves won't share a clevis pin.

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Lightnup
Master Marine Consultant

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1016 Posts

Response Posted - 04/12/2006 : 17:49:36

Thanks for the responses guys. From the drawing somewhere in the tech section, I gathered that internal halyards mean having separate main and jib sheaves but I just couldn't tell what held them in place. Hopefully removing the clevis pins won't be a problem.

Clambeach, the back-ordered masthead sheave is the ball bearing design offered by Catalina Direct. The exit block is also back-ordered

but they at least had the deck organizer sheaves in stock.

Thanks again for the advice.

Steve

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