Rust in Cylinders
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Senior User
Joined: Aug 2006
Posts: 129
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From: Salem, OR
Rust in Cylinders
I bought a 460 out of a 1988 F-250 (fuel injected) that I'm planning on tearing down and rebuilding to put in my 78 F-250. I got the heads off this weekend, and found that (2) cylinders have some rust in them. I'll post pictures tomorrow when I get them on my computer. I won't be able to take this block to the machine shop for a while, since I have to save more for the truck fund. Is there anything I should do to these cylinders in the meantime to get rid of the rust, or at least check to make sure that the cylinder walls are going to be ok? Can I take the block to a machine shop and just have them clean it up? Any thoughts? Thanks.
Elder User
Joined: Jun 2004
Posts: 800
Likes: 6
From: Edmonton, Alberta Canada
depends on how bad the rust is.
if it is just light surface rust, then you can take some 220 -320 grit sandpaper and some light oil and just sand the rust off. wash down with some paint thinner or something like that and then coat all machined surfaces with some spray on perservative like they use at machine shops to protect machined surfaces. you will probably be going with an overbore anyways, so all you want to do is knock the rust off and stop it from growing.
if it is heavier rust, then you will have to determine how deep the pits are and if they can be honed out within reason. don't think you would probably want to go over 80 thous oversized without sonic checking the walls. probably best to let a machine shop determine that though.
rgds
Mike
if it is just light surface rust, then you can take some 220 -320 grit sandpaper and some light oil and just sand the rust off. wash down with some paint thinner or something like that and then coat all machined surfaces with some spray on perservative like they use at machine shops to protect machined surfaces. you will probably be going with an overbore anyways, so all you want to do is knock the rust off and stop it from growing.
if it is heavier rust, then you will have to determine how deep the pits are and if they can be honed out within reason. don't think you would probably want to go over 80 thous oversized without sonic checking the walls. probably best to let a machine shop determine that though.
rgds
Mike
Elder User
Joined: Jun 2004
Posts: 800
Likes: 6
From: Edmonton, Alberta Canada
that looks nasty. i doubt if that block can be saved, but you never know.
i think the hardest part is going to try and get the piston out.
but 460 blocks are plentiful, so most machine shops will just scrap that block and get a better one to work with.
good luck
Mike
i think the hardest part is going to try and get the piston out.
but 460 blocks are plentiful, so most machine shops will just scrap that block and get a better one to work with.
good luck
Mike
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
I've seen worse... MUCH worse. I've seen heads just as bad, and cleaned them up to look like new. It takes a lot of time and weather to really hurt these old irons. You still don't want to have to fight with rusted fasteners or stuck pistons, but you just may. Try penetrating oil on the rusted area, let it soak for a day, and try to clean it. I have seen engines filled with diesel fuel that seems to protect them for long periods. (Got my 351C that way)
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