BoatBanter.com - View Single Post - How do I dissolve corrosion between the upper and lower unit on an outboard engine?

iBoat Often

In article ,
says...

On Sun, 14 Aug 2011 12:05:18 -0400, iBoat Often wrote:

In article ,
says...

On Sun, 14 Aug 2011 09:23:20 -0400, iBoat Often wrote:

In article ,
says...

On Sat, 13 Aug 2011 13:07:35 -0700 (PDT), stp
wrote:

On Aug 10, 1:34*pm, "Califbill" wrote:
"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.

You do know that once you remove the bolt that holds the trim tab on
that there is another fastener underneath it that holds the lower unit
on.

Not on the 125 outboard.

Most outboards do.

Not any Mercury I know of

The bolt that you loosen to adjust the trim tab is the bolt that holds
the lower unit on?? Isn't that way on my Force, and it wasn't that way
on the Evinrude I had before. Makes me want to go take apart the
neighbor's Merc!!!

Not exactly, on a lot of Merc outdrives you have to remove the trim
tab to get a socket on the sixth bolt that holds the lower unit on.

I think outboards use only five bolts and removing the trim tab (bolt)
is not necessary.

Any outboard I ever had had a bolt that you had to take the trim tab off
to get to.