How to replace "wheels" on single blocks?? - SailNet Community
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post #1 of 17 Old 07-18-2008 Thread Starter
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How to replace "wheels" on single blocks??

Am on my third boat and still dont know what to do when I have an old and melted -looking wheel on a block..in this case a single block..can I replace the plastic pulley?
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post #2 of 17 Old 07-18-2008
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Souljour-

It depends on who made the block and how it was designed. Some don't have user replaceable sheaves, others do. It would help if you posted a photo of the block in question.

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Okay thanks.... I dont know if the photos will come thru but here are the two culprits....is a mounted single block and what i will probably erroneously call a tethered single block...these both have major warp issues with the sheaves..do u think they can be manually replaced by someone like me or do I need to buy new blocks altogether??? Thanks.. Morgan
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Again... only an idiot would expect anyone to be able to give any advice based on the little information you've provided. You haven't mentioned the brand or model of block. Without knowing what brand and model of block, or at least a decent photo of the blocks in question, there is no way to know if the sheaves are user replaceable.

The "mounted single block" could be a cheek block, which looks like this one from Lewmar:



Is the "tethered single block" a block on a shackle? A block on a shackle looks like this:



The sheaves on the bottom block in these two photos are replaceable IIRC, the sheaves in the block in the top photo are not.

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Originally Posted by souljour2000 View Post
Okay thanks.... I dont know if the photos will come thru but here are the two culprits....is a mounted single block and what i will probably erroneously call a tethered single block...these both have major warp issues with the sheaves..do u think they can be manually replaced by someone like me or do I need to buy new blocks altogether??? Thanks.. Morgan

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—Cpt. Mal Reynolds, Serenity (edited)

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Okay..sorry...no pics of single blocks...okay...one more time....Does anyone know if I can replace the sheaves on these blocks or do I need to buy new ones...thanks all...

here are links to the pics of the single blocks in question:

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No, I don't believe you can. Those appear to be riveted construction, which means you'd have to drill the rivets out. Blocks with replaceable sheaves are bolted together. The blocks you've posted photos of are low-end models, which generally need to be replaced as a unit.

Unfortunately, your hand is in the way and I can't tell what the end on the second block looks like. It would help if you said what boat it was. It would also help if you said what kind of line it was used for. For Halyard and other relatively static lines, I'd recommend using Lewmar Synchro blocks. For more dynamically loaded lines, like sheets, I'd recommend using Harken Carbo Air Blocks.

Garhauer also makes some good blocks.

I'd also recommend you read the post in my signature.

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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
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her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Last edited by sailingdog; 07-18-2008 at 10:41 PM.
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Thanks very much Sailingdog...I suspected they were not going to be replaceable either after having another look...they are the jib sheet blocks from an old 1983 hunter20 ...I dont have alot of funds for much at the moment so would I might consider drilling out the rivets though they look pretty tough...and running a pin/shackle arrangement through instead...or something to that effecet if it looks like it could work...thanks for all the help...I will be trying to get better at posts in here......Morgan
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Given the prices for the smaller Lewmar Syncro blocks, I think you'd be better off buying them, rather than trying to cobble something together. THink about the cost of the replacement sheaves, pins and such, and you're pretty much at what the Lewmar Synchro blocks are going to cost.

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her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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I agree...thanks for all the help Sailingdog!
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read the post in my signature...
there's a fair bit of advice there on how to maximize your time on sailnet...

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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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