Posted by Bob Kerr on January 02, 2008 at 08:26:49 from (64.12.116.73):
In Reply to: Bolts and Nuts posted by GordoSD on January 01, 2008 at 17:56:00:
Has anyone else had problems with removing plated bolts that have been in place a long time? I got to the point where if I do replace one and it is plated, I dip it in phosphoric acid to remove the plating and after cleaning it up, dipping it in steam cylinder oil(lard oil) before replacing it. I think the plating helps creat galvanic action and gets them really stuck. When I rebuilt my very rusty 10-20 I noticed a lot of the bolts unscrewed and the threads were great, even the ones in the radiator! I only twisted off a couple bolts on the whole tractor and they were on the manifold! I found out they used lard oil to cut threads back then. Steam oil contains lard oil and it is water compatable so if the tractor sits outside the bolts won"t rust up in the holes. Next time you are at a show where there is a steamer, talk to the guy, he may give you a quart of steam cyl oil, great stuff! Power plants use it also in the steam turbins.
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