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Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

Sheave dimension needed

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Brentc
Deckhand

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USA
7 Posts

Initially Posted - 04/14/2004 : 15:11:10

Hello all,

This in reference to a 1985 C25 SR/FK #4881 with the original wire/rope halyards, all external therefore 4 masthead sheaves. I am in the process of replacing my masthead sheaves and will switch to all rope halyards. I am not going internal. Based on my research I will purchase a couple of 70-75 ft 5/16th lines for jib and main halyards. (no V12 high tech tails or mid-splice, the commander has slashed the boat budget with her mighty saber, therefore "poor boy" all the way).
I currently can't climb the mast and actually measure the stock sheaves, but I do know that they are the original factory. I the process of attempting to order the sheaves I ran into several diffent measurements.

First, at Catalina Yachts, based on what the parts person told me, I ordered four sheaves that are 1 7/16 inch diameter, 3/16 axle (pin hole), and 15/16 wide, with the groove radius for a 5/16 line.

While looking at the manual and parts list on this website I looked up the part number found it was 2 inch diameter, 5/16 inch hole and 15/16 wide. (different diameter and axle hole)

Next I called catalina direct thinking I had ordered the wrong part and was given a different dimension yet again.

I have now ordered a set from belpat marine. Ed ask me to find out my sheave dimension. Since I can't get to the boat right now, I said just send me what ever is standard for my boat. The sheaves are on the way. However, when Ed indicated the dimensions of the sheaves they were once again different. (2 inch diameter, 5/16 axle, and a width of approximately 4/10th.

Therefore, I will be getting a lot of sheaves delivered shortly, and one of them will fit. (I may used a hammer and chisel, but one is gonna fit).

My questions is a follows:

Does anyone know the defacto correct answer to "What size are the sheaves on a 1985 C25 with factory external rope/wire halyards?"

Thanks in advance,

(kinda reminds me of the old gospel standard "Bringing in the Sheaves"

Brent Choate
#4881

Brent Chaote
84 C25 FK/SR
#4881

Edited by - on

Happy D
Admiral

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921 Posts

Response Posted - 04/14/2004 : 19:00:48

Hi Brent C.
I ran to the top of the mast right quick and pulled out my sheaves to measure them for you. Actually, the mast is hanging on the wall in the shop so I ran to the top of the ladder. Ok I walked.
My sheaves are 2.240" Diameter at the OD. The sheave is .400" wide. The pin is .312" x 2" long.
Bear in mind that my boat is a 1977 standard rig. Wire Halyards. Things may have changed by 1985.
I put a picture here if you are interested. http://home.wmis.net/~dhapp/sheave.jpg The line laying there is 5/16".
Let us know how it turns out. I am planning on doing the same thing.

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 04/14/2004 : 19:08:11

My belpats are great for my 1/4.

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Brentc
Deckhand

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USA
7 Posts

Response Posted - 04/14/2004 : 19:16:29

Thanks Dan, that was fast. The .312 is a 5/16 which is exactly what I am getting from belpat. (2 inch diameter, .400 width, .312(5/16) pin. I will let you guys know how the project goes. By the way, I do have sheaves coming from the other vendors. If I can't return them, I will put them on the swap board. (with measurements).

This forum never ceases to amaze me with the knowledge of the group. I wished I had a similiar source of info for other items in my life, especially the dang sprinkler systems that refuse to be programed.

Hey fhopper, are you using a 1/4 halyard?

Brent

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 04/14/2004 : 21:26:53

Yes, The 1/4" is a little better fit on the sheaves and is available a a lot of different specs. I got a nice stretchy one for my spinnaker halyard-1/4" XLS Extra 75' @ .77/ft, (it is on a block hanging from the front of the mast head), the other two are external and run on the four sheaves, 1/4 Ultra-Tech 75' @ .70/ft. I figure anytime I am going to haul hard enough on a line that the small diameter matters I will be using gloves and my winches. I got my halyards at Layline.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 04/14/2004 : 21:41:31

Brent: My boat is not much newer, and Ed's (Belpat's) sheaves were perfect. In fact, they are custom made to the specs that somebody gave him for the C-25, because at that time Catalina Direct's were too small--the diameter let the halyard chafe on the casting, and nobody else had anything off-the-shelf.

You're in good hands...

Edited by - on

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