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Catalina/Capri 25/250 Sailor's Forums

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Time to replace the Sheaves?

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T O P I C R E V I E W
k3fuller	Posted - 02/18/2020 : 15:29:07 I'm getting ready to put the boat back in the water and have the mast down. While replacing the anchor light and doing a masthead inspection the halyard sheaves looked a little wonky. I figured they were original 2004 vintage. Being inexpensive I decided to replace them. Having gotten them out today and replaced with new ones today I think it was probably a good decision. https://drive.google.com/file/d/1YHvCDjLil0pdweT7-Od7hhlzQca1GazP/view?usp=sharing https://drive.google.com/file/d/1YNT1RtpQIzJOa96l615E8bjA_JR4-jyC/view?usp=sharing https://drive.google.com/file/d/1YFnve__EXAAkaajgm-nMoqzz_yiyNhlr/view?usp=sharing
12 L A T E S T R E P L I E S (Newest First)
Russ.Johnson	Posted - 03/03/2020 : 21:49:48 Kemp, I agree, I didn't know how soft that cast aluminum could be. I did remove more than I needed. To post photos, I see you are a paid association member. Please login to the Members Area and select Upload Image from the menu. Then follow the instruction to "Post an Image to the Forum". There is also an Instructions page from the menu. Note: It takes some practice. Please let me know if you have any questions. Russ
k3fuller	Posted - 03/03/2020 : 19:44:32 Hi! I wish I knew how to post photo's here, I can't find any instructions. You sure did cut that back! I didn't have all that far to go. The forestay is connected to the lower in the correct area and the spinnaker one is unused. :- )
Russ.Johnson	Posted - 03/03/2020 : 16:29:30 Kemp, I just noticed on your masthead photo, is you forestay connected to the upper or lower pin? Here's a wider photo of my masthead Here's the diagram from the owners manual. http://www.catalina-capri-25s.org/manbro/pictures/m25013.gif
Russ.Johnson	Posted - 03/03/2020 : 16:08:12 Kemp, Here's your masthead photo (hull 781) Here's my masthead photo (hull 793) I filed the casting on both the left and right side. Notice the area to the left of the halyard.
Russ.Johnson	Posted - 03/03/2020 : 16:07:04 Kemp, I copied your sheave photos (hull 781) Sheave1 Sheave2 Sheave3
Russ.Johnson	Posted - 02/23/2020 : 09:21:09 Kemp, I'm glad I could help. Since our boats are 12 numbers apart, I thought we might have the same issues. I did notice your casting was rough on the base, but mine was rough on the sides. I'll post some photos next time I'm at the boat. Thanks, Russ
k3fuller	Posted - 02/22/2020 : 17:29:36 Russ - I inspected the masthead and yes, catalina did a poor job finishing the casting where the halyards exit. The sheave for the main halyard extends out far enough that there is a fair amount of clearance and it won't touch the masthead. But on the Jib side, the sheave is more 'inside' and the masthead is basically like a knife edge extrusion (Pic below). I'm really glad you said something, it's a small but important detail. If I had a hank on it would probably be fine because the halyard would be held more forward but with the furler and the halyard restrainer that effectively pulls the halyard against the masthead and right across this knife edge. I then examined the jib halyard and I have damage where it exited the mast and was chafing. The halyard is new last season so it's not a lot of damage but is clearly there. I took a dremel tool and ground the masthead so that it was smooth. That should make things better but I'm going to add it to the list of things to check periodically. Thanks much!!!! https://drive.google.com/open?id=1_0c0Tym7YMnlEaccYf0MJrI2DZkcerZB
Stinkpotter	Posted - 02/21/2020 : 15:22:31 quote: Originally posted by k3fuller ...I have some outside damage from the cotter pin holding the clevis pin in, the sheave must not have been rolling ON the pin but rolling THE pin... That would suggest a lot of friction. A more common and worrisome problem is the clevis pin being galled into the mast-head casting and requiring some (gentle) use of a hammer to pop it out, hopefully without breaking the casting. Sounds like that was not your case.
k3fuller	Posted - 02/21/2020 : 13:34:48 Hi! I have not noticed any issues at the mast head with Chafe but I will double check before I put the mast up tomorrow. I have some outside damage from the cotter pin holding the clevis pin in, the sheave must not have been rolling ON the pin but rolling THE pin lol. Hope it's all fixed now. If I see anything at the mast head I'll take a picture and post it.
Russ.Johnson	Posted - 02/20/2020 : 21:41:36 Kemp, Thanks for the photos, I'll check my sheaves. A few years ago, I had my mast down and noticed the masthead casting had rough spots where the halyard exit the sheave. The halyard was getting chafed and it took me awhile to find it. Since our boats are close in age, I was wondering if you had the same problem.
Stinkpotter	Posted - 02/18/2020 : 22:00:05 Agreed. A basic rule of thumb is white and clear plastics are more susceptible to UV damage than black, which contains carbon that (counter-intuitively) somehow protects it. I've seen that demonstrated in everything from sheaves to pipes. My 15 year-old original-equipment white masthead sheaves were crumbling.
islander	Posted - 02/18/2020 : 16:21:17 Those white sheaves Catalina used would crack,craze and crumble from UV damage. The same on the C25. I believe the black replacement sheaves are better. Looks like you caught those just in time. Mine were in worse condition.

Association Forum

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.