If it doesn't discolor the coolant, don't worry about it.
Change your coolant every two years from now on, using the same stuff every
time. This will help mitigate any ill effects from whatever goop there is
left in there.
cylinder liners are cast into aluminum and have no direct contact with
the coolant, the radiator and heater cores are not steel... the only
things that are steel and in contact with the coolant are the drain
plug, the expansion cores and the coolant pump impeller. and they're
all plated. if those are rusting sufficiently to discolor the coolant,
you may have a serious problem on your hands!
double check to see what this material is - a magnet should do it.
/definitely/ use a quality antifreeze and distilled water.
I could have sworn the last Honda 4-cylinder I saw had the iron cylinders
sitting bare-naked in the coolant. They were cast as a siamesed block of
four, and were fully exposed all the way down until they got buried in the
aluminum at the bottom.
the siamese quintuplets are the alloy casting they sit in. it's an
unusual arrangement for sure. if you're doing a gasket scrape, it's
easy enough to test what's where because the soft alloy bit can be
scratched by the blade, the steel bit not. i'll see if i can take a pic
next time i'm in a junk yard.
This is interesting. Guess the example I saw was dirty engough I couldn't
tell there were two different metals in there. This explains the factory-
specified max bore-out tolerance being a micro-thin .010".
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