Engine/Castiron Rust Removal

[WI Dave]

I've finally started the Farmall H clean-up and paint project. I've decided not to sandblast the cast frame and engine block. The engine has been cleaned with oven cleaner and then pressure washed. It has a little of the old paint on it, but is mostly surface rust. How will I remove the rust from areas the wire wheel won't reach? Is OSPHO not recommended for cast? Thanks for any advice.

 

[CNKS]

I don't like using phosphoric acid on cast because it may (or may not) get trapped in the pores. However I do use it in nooks and crannies where the paint lifting does not show. But, I have numerous wire wheel type attachments for an electric drill, most of the time I can get it clean. Also, a little rust on cast, where you can't see it will do no harm, unlike sheet metal. There are very few places on an H you can't get clean, provided you have completely stripped the engine and chassis.

 

[WI Dave]

I'm planning on stripping off any parts that'll come off. Some have already been sandblasted and epoxy primed. I drove it home today, about 12 miles, and found a few oil leaks I'll have to take care of, and some steering issues to address. I'm only 5 months behind schedule, so far!

 

[BUTCH IN N.Y.]

If you encounter any small tight areas that you
still have to remove paint or dirt from after
cleaning with another larger tool like a
grinding wheel or sandblaster, why not
consider a Dremel Moto-tool. They're easy to
maneuver around tight areas and have bits to
handle most anything. It may take a while but
it gets the area clean, Thats one of the many
uses my three get put to, Variable speed,
single speed and cordless. On some things, I'm
a nitpicker about, some things not.

 

[charles todd]

OSPHO whether on cast or sheet metal is better than rust... I'd use the OSPHO if in doubt. Let it dry for several days then scotch-brite off the dried residue. You primer/paint will be fine.

CT