Frozen/Stuck aluminum blocks for jibsheets - SailNet Community
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post #1 of 7 Old 06-02-2019 Thread Starter
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Frozen/Stuck aluminum blocks for jibsheets

Hello,

I have a problem with stuck/frozen jibsheet blocks. They appear to be made out of aluminum.

I removed them from the tracks and was wondering what I needed to un-jam them?

I have added a picture of the block if it helps.

Thank you!
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post #2 of 7 Old 06-02-2019
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Re: Frozen/Stuck aluminum blocks for jibsheets

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Originally Posted by hildamman View Post
Hello,

I have a problem with stuck/frozen jibsheet blocks. They appear to be made out of aluminum.

I removed them from the tracks and was wondering what I needed to un-jam them?

I have added a picture of the block if it helps.

Thank you!
I would try WD-40 maybe bang it with a soft mallet or put some channel locks with padding to try to free it up. If that does not work, try Aero Kroil a superlative corrosion anti-seize formula. If that does not work consider replacing/upgrading.

Jordan
West Wight Potter 14 "Lemon Drop"
Oceanside CA
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Re: Frozen/Stuck aluminum blocks for jibsheets

I've had moderate luck soaking aluminum/SS parts on Marvel Mystery Oil for a couple of weeks, but all my normal go-to decorrosion products won't touch that combo. Freshwater will help dissolve the salt, but heat is the only sure method w/o risking damage to it unless it has plastic bearings.
Whatever you try, add lots of patience because if you don't want to damage it, tiny steps are best.

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post #4 of 7 Old 06-02-2019
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Re: Frozen/Stuck aluminum blocks for jibsheets

Can you not remove the axle bolt and take them apart?

Start with a good soak in penetrating oil. If you can get them apart, even better. Once you get the sheave freed up you can spend some time polishing out the corrosion.

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Re: Frozen/Stuck aluminum blocks for jibsheets

Corrosion X. Oil wrench with the hard rubber loop. Sharp taps with small hammer. Get new ones.

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post #6 of 7 Old 06-02-2019
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Re: Frozen/Stuck aluminum blocks for jibsheets

Channel locks with padding on the sheave. Rock the sheave back and forth slowly and liberally spraying with your choice of penetrating oil. It would be relatively easy to drop the block in a covered container of 1/2 and 1/2 solution of acetone and automatic transmission fluid. You'd need to seal the container so the acetone doesn't flash off. A salsa container or other plastic bucket with a snap on lid should work. Soak for a couple of days and try the channel locks. Heating just the sheave wouldn't hurt but be sure there is no plastic, etc in the block. Since it's frozen probably no problem with a plastic bearing.
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Order a new one and do other work on the boat before it arrives.
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