"jamesgangnc" wrote in message
...

On Aug 9, 9:15 pm, Richard Casady wrote:
On Sun, 07 Aug 2011 21:35:36 -0400, "





wrote:
On Sun, 07 Aug 2011 18:07:59 -0400, wrote:

How do I dissolve corrosion between upper and lower outboard unit so
to get at the impeller?

I took all five nuts off (125 mercury sal****er) the studs holding the
lower unit on. I had to use penetrating spray to get the washers off.

After whacking the seam dividing the upper and lower with a rubber
hammer till blue in the face I etched/scored/scratched the seam to
allow penetration spray to work in, nothing.

After 24 hours of repeated spraying whacking and more scoring, the two
halves still won't come apart. Short of pounding in a chisel (gouging
aluminum), and prying them apart, anyone have an idea?

Try heating just one of the parts, a gas welding torch gives a lot of
heat in a small area. In Des Moines, one supermarket chain has dry ice
in a vending machine for two bucks a pound. Chill and then heat one
half.

Casady- Hide quoted text -

- Show quoted text -

Heating is going to ruin the paint.

I have used the putty knife followed with a chisel successfully on i/
o's. Really gop up the steel parts with antisieze when you put it
back together.


Reply:
Can be the drive shaft corroded to the power head. May have to cut a hole
in the leg and then cut the shaft. replace shaft and have leg welded.
Also, I had to have the chips in the leg welded on a Mariner 15 that did not
want to come apart and had to pry apart.