Corrosion on Blocks/how to remove?

[boatbecause]

We have some blocks that seem quite substantial that are seized up so that
the "pulley wheel " does not turn. We would like to bring these blocks back to life. The only marking is a small three prong Poseidon's fork. Does anyone have
a remedy? Thanks David

[mitiempo]

Merriman I believe is the brand. One of the oldest names in marine hardware. PB Blaster and vinegar are both worth a try.

[celenoglu]

Try to free them with some diesel or oil. Leave them in diesel for a day and try to move them later. If this works oil them slightly and make sure they properly work.

Using acids is needed if the above fails. Acids work on rust but also work on metals and other parts. While removing the rust the metal parts already weakened due to rust will further detoriate. Use weaker acids in the beginning such as vinegar. You can try oxalic acid later.

[fcsob]

I would not soak them in diesel. PB blaster is good but I've found other penetrants that work better. Kroil and Tri-Flow are my favorites. Apply let set for a day or so and work gently and re apply. Take your time.

[boatbecause]

I really appreciate your advice. I will begin with the weakest and move to the stronger
over time until it will loosened up. Great advice, thank you. On a side note, I came across
a sailor that is doing the circumnavigation of the Americas solo. He is doing this for C.R.A.B
a sailing charity in Annapolis. His website/blog is Solotheamericas.org Don't miss this
blog.

[BubbleheadMd]

Kroil, until they're loosened and moving. Then rinse them with fresh water and re-lubricate with McLube by Sailkote. Good stuff.

[jackdale]

I have not seen any mention of WD-40. I have used it to clear up corrosion on everything from my rigging knife and leatherman to can openers. Some use it as an lubricant, but it is a penetrating oil.

[Alive3and3Well]

WD-40 also works as a short term protectant.

[jackdale]

Originally Posted by Alive3and3Well

WD-40 also works as a short term protectant.

A quip I once heard when I was involved in motorsport.

"If it is stuck and should be loose use WD-40; if it loose and should be stuck use duct tape."

[fcsob]

McLube makes sailcoat and other lubricants.