Tuesday, July 4, 2023

Replacing the Masthead Sheaves

Replacing the Masthead Sheaves on our Catalina 34 - In the water!

I plan to replace the Standing Rigging on our 1987 Catalina 34 Tall Rig Fin Keel later this year.

My plan  is to replace the rigging while the boat is in the water and not to pull the Keel Stepped Mast.

Pulling the mast would make it a lot easier, but it's crazy expensive here in South Florida. just to have the mast pulled. Just removing the mast and replacing it will cost about $3,000 !!!!! 

So, how to complete the task with the boat in the water?

The Rigging consists of 
  1. Forestay ( $600 )
  2. Backstay ( $1000 )
  3. Port & Stbd Upper Shrouds ( two ) ( $1900 )
  4. Port & Stbd - Fore & Aft Lower Shrouds ( two pair ) ( $1250) 
Rigging materials = $4750 + Taxes and Shipping -- Guesstimate $6000 ( as sold by CatalinaDirect )

The sheaves at the top of the mast are part of the Mast head and there lies the problem. I have gone up the mast several times ( 5 times in one month when our Wireless Wind Transducer Failed ) so I'm very comfortable about going up the mast and do not see any problems working to replace the standing rigging, but the sheaves are another problem because when I go up the mast, I am supported on the halyards that run on those sheaves that I want to replace!!!!

My solution is to install Mast Steps from about 6 feet from the top of the mast, the highest being enough to support me on both sides of the mast while removing the Masthead.

So, the plan would be to measure all of the rigging, purchase the correct size cable and new turnbuckles and any beckets that need to be replaced ( most of them ) and of course, purchase the mast steps.

Then going up the mast and install the mast steps. With the steps in place, I would replace the standing rigging one cable at a time. First I would backup the cable with a halyard or dyneema cable taking the strain off of the piece of standing rigging. Remove the piece of rigging and make up the replacement using Mechanical Fittings.

Next, onto the Mast Head.

There is a halyard that does not attach to the Masthead ( Spinnaker halyard ) I would use this to climb the mast using the other halyards to climb up the mast to reach the newly installed Maststeps.

At the top, I would unbolt the masthead and remove the sheaves, replace them with new sheaves and pins then replace the mast head.

Sounds pretty straight forward, but it is a boat!!!!

Posting this hoping to get some feedback on the project.

Rigging Dimensions

No comments:

Post a Comment

Got questions or suggestions about our boat, our sailing or our adventures?
Leave a comment.