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Old 03-28-2012
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Snatch Blocks; In desperate need of cleaning

In going through the new to me boat I removed 7 snatch blocks (with a N M insignia) and they are in need of cleaning. The spring pin on the shackle is very stiff on most of them. I disassembled the sheaves and found they are in very sad shape. I plan to soak them and the roller bearings in a can of kerosene (paraffin for you folks that speak funny English) or maybe Simple Green full strength.
Question is when I reassemble them should I put a light coating of lithium grease on the roller bearings (a la Winches) or just a light oil?
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Old 03-28-2012
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Re: Snatch Blocks; In desperate need of cleaning

Are they snatch blocks, or just blocks with a snap shackle on them?
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Re: Snatch Blocks; In desperate need of cleaning

Oh, they're snatch blocks!
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Re: Snatch Blocks; In desperate need of cleaning

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Originally Posted by sailordave View Post
In going through the new to me boat I removed 7 snatch blocks (with a N M insignia) and they are in need of cleaning. The spring pin on the shackle is very stiff on most of them. I disassembled the sheaves and found they are in very sad shape. I plan to soak them and the roller bearings in a can of kerosene (paraffin for you folks that speak funny English) or maybe Simple Green full strength.
Question is when I reassemble them should I put a light coating of lithium grease on the roller bearings (a la Winches) or just a light oil?
Clean the shackle pin with WD40 or another penetrant. Squirt some in and work the pin in & out - repeat and repeat until it works smoothly. Those pins always tighten up if they aren't worked regularly.

For the rollers, if kerosene doesn't do the trick, try diesel - it cleans things very well, if you can stand the smell. A little white lithium should keep them rolling nicely - be sparing with it or you'll have it on your deck & sails.
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Re: Snatch Blocks; In desperate need of cleaning

You may wish to polish the pistons --a fresh dollar bill works well -- and lube with McLube.
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Old 03-29-2012
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Re: Snatch Blocks; In desperate need of cleaning

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Originally Posted by Hudsonian View Post
You may wish to polish the pistons --a fresh dollar bill works well -- and lube with McLube.
Since when is a $1 bill good enough for ANYTHING on a sailboat?
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Re: Snatch Blocks; In desperate need of cleaning

Quote:
Originally Posted by sailordave View Post
In going through the new to me boat I removed 7 snatch blocks (with a N M insignia) and they are in need of cleaning. The spring pin on the shackle is very stiff on most of them. I disassembled the sheaves and found they are in very sad shape. I plan to soak them and the roller bearings in a can of kerosene (paraffin for you folks that speak funny English) or maybe Simple Green full strength.
Question is when I reassemble them should I put a light coating of lithium grease on the roller bearings (a la Winches) or just a light oil?
Roller bearings are designed to roll. Adding grease or oil will allow them to collect debris which inhibits there action. A preferred treatment is a thorough dosing with SailKote dry lubricant before reassembling the blocks. Boeing T-9 seems to be a better treatment for the shackle pins once the surface rust is removed.

FWIW...
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Re: Snatch Blocks; In desperate need of cleaning

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Originally Posted by svHyLyte View Post
Roller bearings are designed to roll. Adding grease or oil will allow them to collect debris which inhibits there action. A preferred treatment is a thorough dosing with SailKote dry lubricant before reassembling the blocks. Boeing T-9 seems to be a better treatment for the shackle pins once the surface rust is removed.

FWIW...

That's what I was wondering. Some of the sheaves are caked w/ gunk. Some of fairly clean and dry and seem to be working just fine. I've stripped winches a gazillion times but never had to tear down a snatch block. I'll try a dry lube and see how it works. Thanks.
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Re: Snatch Blocks; In desperate need of cleaning

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Originally Posted by svHyLyte View Post
Roller bearings are designed to roll. Adding grease or oil will allow them to collect debris which inhibits there action. FWIW...
That's exactly why I use white lithium - it doesn't seem to hold dirt & debris like heavier greases.

Don't those dry lubricants require frequent recoating?
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Re: Snatch Blocks; In desperate need of cleaning

Crossion X from APS works really well.
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