To my limited knowledge, electrolysis only works for rust removal,
not carbon, oil residue or sludge. We used it a fair amount, in our
shop, for rust removal.
On 2/2/2019 11:02 AM, James Dlapa
An none invasive way I would consider would be
electrolysis. There are many videos on you tube. If taken to a
shop, look into vapor honing.
I have used white vinegar to clean rust from
several parts in the past, and if not rinsed well, tends to
leave a black coating. Perhaps this is what is it from ?
On Sat, Feb 2, 2019 at 7:51 AM Jim Bollman <Jim@...
I hope some one with hands
on experience will jump in but here is my suggestions.
Never ran across one with a black coating but I would
start with some solvents, and a brass wire brush for the
bearing surfaces. You can be more aggressive on the none
machined areas. Go more aggressive on the journals only if
needed to or you will end up having to have the crank
ground even if it is good. Other approach would be to take
it to a machine shop that does crank work and ask their
opinion they may have some kind of dip tank to clean up
cranks before they grind them. Determining which crank you
have is a good start before you put much time and money
into it, if it is an early style I would clean it enough
to not get my hands dirty when moving it around and put it
on the shelf if you ever get desperate for a crank.
On Feb 2, 2019, at 7:56 AM, Jim Murphy <lftrn97@...
Jim just curious about how you to clean up a
crank that has been sitting in a non-running
engine for years. Not rusty but just an overall
black, dirty finish. The journals look just like
the throws. So far I can't distinguish any
numbers. I assume degreaser, but then what? I
understand you can't blast cast iron. Should the
surfaces be lightly ground or sanded and can the
journals be polished? Based on this thread maybe
we should start a TV series on the History Channel
titled "The Curse of the Crosley Crankshaft".