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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Mast Pulley		  New Topic  Topic Locked
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Daren
1st Mate

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USA
81 Posts
Initially Posted - 11/28/2006 :  14:30:44  Show Profile  Visit Daren's Homepage
OK, total newbie question. All you Admirals, captains, and other wannabes' who know more than I do just sit tight....

On my 25' Catalina, there are two wheels/pulleys at the base of the mast on the port and starboard side - right at the base. The starboard side wheel need to be replace due to age. This right wheel at the base is where my main halyard enters the mast on its way up to the top an then back down (on the outside) and connects to the clew of the main.

Are these wheels/pulleys called "sheaves"?
S/V Prima Donna
1986, 15 HP Universal Inboard Diesel, Fixed keel, Hull # 5362
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/28/2006 :  15:41:31  Show Profile
Like this?



That's called an "exit block", and the plastic "wheel" in it is called a "sheave". You can get a replacement from Catalina Direct.
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ddlyle
Captain

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302 Posts
Response Posted - 11/28/2006 :  19:45:07  Show Profile  Visit ddlyle's Homepage
I need to replace mine too.
How the heck do I get the screws to come loose?
I sprayed sh_tloads of WD40 in there to hopefully get them to loosen, but nooo.
Thanks.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 11/28/2006 :  19:58:40  Show Profile
"How the heck do I get the screws to come loose?"

Ah, the miracle of bi-metal corrosion. When working with sheet metal screws into aluminum I've had to grind the screw heads off with an angle grinder and work them out that way... or perhaps use a LH drill. Be sure to use Lanocote, Never-seize etc when you put it back together and the next time it might be easier.

IMHO: WD-40 doesn't make a very good penetrating oil. I use PB-Blaster, but I don't know how much good it will do on aluminum/stainless corrosion.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/28/2006 :  21:02:17  Show Profile  Visit Frank Hopper's Homepage
Try your creambrulee torch on them, it might break the corrosion bond. I replaced mine but I am a fresh water sailor. They were a little tough but a large screw driver by hand was enough for mine.
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Derek Crawford
Master Marine Consultant

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USA
3321 Posts
Response Posted - 11/28/2006 :  22:23:06  Show Profile
Try Liquid Wrench - it's always worked for me.
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stampeder
Master Marine Consultant

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1608 Posts
Response Posted - 11/28/2006 :  23:34:03  Show Profile
Excellent question Daren. I called them 'thingys' for way too long.

Welcome to the forum.
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Daren
1st Mate

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USA
81 Posts
Response Posted - 11/29/2006 :  06:51:54  Show Profile  Visit Daren's Homepage
Thanks all who responded. This is one of three tasks I need to undertake this winter, the first is an antenna re-wire....
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ddlyle
Captain

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302 Posts
Response Posted - 11/29/2006 :  20:23:30  Show Profile  Visit ddlyle's Homepage
Frank,
You always bring a smile to my face.
anyone else might have said propane torch.
But I got to recall that wonderful crunchy light caramel taste.
I wish I had a torch. Maybe I can borrow one to try (after I soak it with liquid wrench and let it thoroughly evaporate).
Coo !!
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/30/2006 :  08:26:38  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by ClamBeach</i>
[brAh, the miracle of bi-metal corrosion. When working with sheet metal screws into aluminum I've had to grind the screw heads off with an angle grinder and work them out that way... <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
A simpler way to eliminate the heads is to clamp a vice-grip to the handle of a screwdriver, and then use it as a crank... POP! But I like the torch idea--except I wouldn't try it <i>after </i>blasting Liquid Wrench or WD-40--you might burn up the wires inside the mast!
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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.