Are they held in by a press fit?

Thanks

They are screwed in..

Mr gadgets do you have a direct email where I can contact you.

Thanks

kevin

They are installed by Mercury with special threadlocker. You
are never suppose to remove the tower. If tower is bad the
housing is also no good. It's not available as a seperate part.

Kevin.

dtryce2yahoo.com

change the 2 to shift 2. that will get to me.

Dick

Thanks.
Kicking around making 1 for my standard Bravo 1 drive while it's apart and looking into the options to retain it. Not a whole lot of realstate there to work with.
I kow of 1 person that presses them in and is running a huge power in front of his boat with no failures in last few yrs. Also builds his own cap from billet Al. to complete the upgrade. Alos read were some are threaded in. I assume there is a shoulder under the flange of the tower to locate with the threaded ones.

Max worx takes a std bravo upper hsg and bores a hole completely thru to the bottom then their tower extends completely thru the upper,the bottom of the tube on their tower is threaded and a piece threads on to it that replaces the .250 thick piece that would normally go into the top the lower with the oring,they also counterbore the floor around the original aluminum tower to locate the top of the tower. its a pretty solid design,Smitty

Smitty,
didnt you have some issues with that tower setup when you tried to use a spacer?
My towers are threaded 2" into the case. I have not seen any problems with them.

Once you have the tower modified, is there any way to strenghten the housing to keep the gear from pushing forward towards the gimbel bearing?

Our CNC doesn't have enough height between the table and spindle once the boring head is installed w/ bar to allow me to bore all the the way thru. That does look good, but not sure I see the gains from going the full length. Only thing I really see is it's another way to retain the insert. I'd think a good 1" depth for location and support followed with an 1" of threads would be fine. But haven't looked real close yet to see what is doable or not.

Does the manual #28(?) cover setting the upper gear lash in detail? My service manual yr only mentions of the stampings on the back for shiming. Thanks