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Old 12-03-2011, 19:44   #1
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Replacement Lewmar Sheaves ?

Please help if you can.

I have been searching for replacement sheaves for my Lewmar cheek blocks. They are rather large in diameter and I can't find anything close.

They are white plastic of some sort with a metal lined borehole. They are 3 3/4" in diameter, for a 5/8 line, and I do not know what manufacture line they are from--they were original on the boat.

If you know of where I can find these, please point me in the right direction. I really, really do not want to have to replace these.

Thanks in advance!
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Old 12-03-2011, 21:37   #2
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Re: Replacement Lewmar Sheaves ?

Just machine out of delrin (acetal) round stock. Press in either the old bushing or a new one if the old is actually worn. Anybody with a little shop lathe can do it. Cost is pretty much all labor, free if you have a buddy with a little lathe in his garage.
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Old 13-03-2011, 01:55   #3
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Re: Replacement Lewmar Sheaves ?

Check out Zephyr Werks, great company !
Zephyrwerks - The Sheave Factory

I have all new halyard sheaves from them as do some other P424 owners.

-p
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Old 13-03-2011, 05:35   #4
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Re: Replacement Lewmar Sheaves ?

That would be a 95 mm block. Not very common. What type of block is it?

Right now they only make a 90 mm (unless this is a snatch block) and it's not something so easy to machine. What are you using them for? I've found good prices on the 72 mm blocks. These would work on loads to 2000 lbs. They make singles, doubles, and triples. Pretty good bang for the buck these days. On a 35 ft boat 72 mm is still plenty of overkill.

When the sheaves fail it is usually due to excessive UV and salt.
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Old 13-03-2011, 06:37   #5
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Re: Replacement Lewmar Sheaves ?

Rig-rite, West Marine and Shaefer (sp) have a range of sizes.
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Old 13-03-2011, 06:51   #6
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Re: Replacement Lewmar Sheaves ?

Excerpted from LEWMARLewmar

Ocean Blocks with plastic sheaves are not serviceable.

Racing Blocks with sheaves 60mm diameter and above are serviceable and spares are available. The size of the block is engraved in the cheeks and it is important to identify if 60 and 80mm blocks have plastic low load sheaves or alloy high load sheaves. Please contact us for any information about Racing Block spares.
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Old 13-03-2011, 07:46   #7
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Re: Replacement Lewmar Sheaves ?

Garhauer will custom make ball bearing sheaves for a reasonable price.
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Old 13-03-2011, 22:35   #8
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Re: Replacement Lewmar Sheaves ?

Thank you to everyone for all the quick replies!

Quote:
That would be a 95 mm block. Not very common. What type of block is it?

Right now they only make a 90 mm (unless this is a snatch block) and it's not something so easy to machine. What are you using them for? I've found good prices on the 72 mm blocks. These would work on loads to 2000 lbs. They make singles, doubles, and triples. Pretty good bang for the buck these days. On a 35 ft boat 72 mm is still plenty of overkill.

They are for our jib sheets.

Cost wise, I might consider replacing them with a smaller block as the sheave replacements look like they are going to be over $200. (Darn. I thought this was a simple go to the store and move on to the next item on the "to do" list kind of project.)


Patrick- thanks for the link to zephyrwerks. This would give me the option of keeping the original blocks as I don't know anyone with a lathe. They look like a great company and love that they have their prices on line! The pricing and turnaround time seems quite reasonable for custom work. Even if I do not go this route, I hope somebody else will find this thread and be able to use them.

Thanks again everyone for your help.
Now, decisions decisions.
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Old 13-03-2011, 23:06   #9
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Re: Replacement Lewmar Sheaves ?

If you can't find what you want, try here; Mast, Boom Sheaves and Exit Boxes
or here; APS - Replacement Sheaves and Sheave Boxes
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Old 16-03-2011, 22:06   #10
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Re: Replacement Lewmar Sheaves ?

Thank you for your assistance. In the end, my husband was able to access a lathe and materials at/through his work and we are going with this solution.
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