[6pack] Corrosion in cylinder bores

[Robert Lang]

On Tue, 29 Jan 2008, John North wrote:

> I procrastinated too long on engine re-assembly.   Now I see the
> beginnings of corrosion in one of the bores.   It's more like staining
> than rust at this point.   What's the best to do?   Will a quick
> polish with 400 or 1000 grit paper do any harm?   Can't imagine it
> will take more than .0005 off the bore...   Other alternatives?

Wipe them down with some motor oil. That'll lift the loose stuff that's 
there and leave a surface that won't rust further.

If the assembly is to take place soon, buy a cylinder hone (or borrow it) 
and run it up/down the bores at low speed with an electric drill. Then 
wipe with a solvent and then clean with detergent and then assemble. I use 
kerosene as a lube when I do the light hone.

You absolutely so not want to remove as much as .0005" from the bore. That 
will change the piston skirt to wall dimension and the result will be 
piston slap. Piston fitment is very precise.

> John North

rml
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