MIKEHTMSR24

My buddy's friend is having problems removing the powerhead off the lower unit. It is a salt water boat.
It is a 1992 mercury 200 offshore series, 2.5 liter v6 (i think it's called a 200xl). There are 10 stainless steel studs that are either cast or threaded into the block that extend down through the lower unit and are secured by nuts. Once the nuts are removed, the powerhead lifts off, BUT, the studs go through a good bit of aluminum (2 of them are prob 10 inches long) and the salt corrosion has worked its way around the studs and are keeping the thing from coming off.
Any advise would greatly be appreciated. I know this is not the correct place to post but need help quickly, Mike. I will post in O/B also.
You can send him an email at [email protected]

Ron P

Soak it in liquid wrench or use a torch to heat it up to expand the area around the bolts.

Ted G

I had to do this with my powerheads also:

The best way to do it is to get an air chisel with a pointed bit. Put the bit on the end of the studs and blast away. I had 2 broken off and they were holding the powerhead firmly in place-soaked it for days and it still would not come loose. 2 minutes with the air chisel and voila-loose powerhead.