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 Check Your Sheaves		  New Topic  Topic Locked
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Initially Posted - 08/22/2017 :  16:51:52  Show Profile
If you have any resistance raising sails while in a lee or while pointed into the wind, check your sheaves at the masthead! Barnacle Bill Holcomb wrote a nice blog post on the subject a few years ago: http://barnaclebillholcomb.blogspot.com/2013/07/old-halyard-sheaves.html

In my case, I was missing the main halyard sheave completely, which I expected after finding sheave looking debris on the deck. The foresail sheave was badly deteriorated, which I should have expected more, but it still worked well! (See photos below.)

Main Halyard Sheave Missing




Foresail Halyard Sheave Deteriorated




One of Two New Sheaves Installed


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
Edited by - sethp001 on 08/23/2017 17:33:50

islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 08/22/2017 :  17:52:18  Show Profile
We have discussed this a few times about those white ones deteriorating from the UV rays. Even CD mentions that when you look for replacements. Mine we're in the same condition although not totally gone.
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


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bigelowp
Master Marine Consultant

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USA
1736 Posts
Response Posted - 08/22/2017 :  18:19:45  Show Profile
A good reminder that shelves, like running rigging, need to be inspected and periodically replaced. All to often "out of sight, out of mind" results in problems when least convenient.
Peter Bigelow
C-25 TR/FK #2092 Limerick
Rowayton, Ct
Port Captain: Rowayton/Norwalk/Darien CT
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 08/22/2017 :  20:59:20  Show Profile
(Peter's auto-spelling-corrector hadn't heard of "sheaves"...)
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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DavidBuoy
Admiral

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USA
707 Posts
Response Posted - 08/23/2017 :  04:36:51  Show Profile
Wait, I thought you were getting new halyards?

Captain Rob & Admiral Alyson
"David Buoy"-1985 C25 SK/SR #5053
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mgarner
Deckhand

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USA
19 Posts
Response Posted - 08/23/2017 :  08:55:45  Show Profile
I will be taking a look at mine this weekend.
Marty Garner
"Midwatch" 1985 C25 4869 TR/FK
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 08/23/2017 :  11:46:30  Show Profile
An early and important lesson for me was to change out the sheaves and get new tech halyards, it was my first experience with CatalinaDirect. Remember bushings are better than bearings for halyard tensions.
Frank Hopper
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 08/23/2017 :  16:55:40  Show Profile
quote:
Originally posted by DavidBuoy

Wait, I thought you were getting new halyards?


Yes, I did. I replaced the sheaves before replacing the halyards. I guess I could take some photos of the sheaves and blocks with the 5/16" line installed.


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 08/23/2017 :  17:33:21  Show Profile
quote:
Originally posted by pastmember

Remember bushings are better than bearings for halyard tensions.


Yeah, I went with the sheaves without bearings.


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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hewebb
Admiral

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USA
761 Posts
Response Posted - 08/24/2017 :  06:42:43  Show Profile
OOPS
My main halyard has a sheave with ball bearings which I installed about three years ago. The other ones are bushings. I had the mast down a few month ago to untangle the topping lift line that was twisted around the main halyard. Did not check for bearing damage then. Seems to work OK-so far.
1988 WK/SR w/inboard diesel Joe Pool Lake
Hobie 18 Lake Worth



Life is not a dress rehearsal. You will not get another chance.
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 08/24/2017 :  08:27:17  Show Profile
I saw that the ball-bearing mast-head sheaves from CD have large-diameter bearing races, which they say spreads the load from halyard tension--apparently that's the circle on the side of the sheave. However, I witnessed the "explosion" of a Harken ball-bearing swivel block that turned a halyard from the mast out to a deck organizer--little red beads went flying all over the boat!
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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Akenumber
Navigator

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USA
247 Posts
Response Posted - 08/26/2017 :  11:39:30  Show Profile
Changing the subject a little. How many of you have had to replace your masthead all together? Mine had some excessive corosion that caused one of the ears to crack. I used lots of mare lube on the new one.
Ken
San Diego
84 C25 SR/FK 4116
The KRAKEN
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sailorbaz
1st Mate

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Australia
26 Posts
Response Posted - 08/27/2017 :  23:18:47  Show Profile
Mine were aluminium and quite badly corroded. I got a local machine shop to turn me up a set in Delrin a couple of years ago and they are still looking good.
Sailorbaz
Sailorbaz
1981 Boomaroo 25, (C25) SK/SR, inboard diesel, Red Robin
South coast, New South Wales, Australia
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bigelowp
Master Marine Consultant

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USA
1736 Posts
Response Posted - 09/15/2017 :  19:47:50  Show Profile
When I got Limerick in 07 Replaced the masthead and the sheaves. I inspect both each season and am ready to replace the sheaves as it has been enough years that simple prevention is in order (and cheap insurance)
Peter Bigelow
C-25 TR/FK #2092 Limerick
Rowayton, Ct
Port Captain: Rowayton/Norwalk/Darien CT
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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.