2011 r25sc engine mount

[nzfisher]

Starboard side engine mount is deteriorating faster than port. Port side looks pretty good, starboard side rust and substantial corrosion taking place. Anyone else having this problem? As a follow up has anyone replaced engine mounts on their boat? Does this job require engine being completely removed or just lifted?

Thanks

 

[Levitation]

What kind of substantial corrosion?
Is salt water being sprayed around during running, like from around the cover of the sea chest or a split hose?
Is there actual loss of threads on the stud?
Can you post pictures?

Without knowing details, I suggest this:
First wire brush any loose scale.
Then treat the rusted metal with vinegar - brush it on and repeat, keep it wet, this can be done for a day or more as needed
Then hose off with fresh water - copiously
Then treat with rust convertor
Then dry it with a fan
Paint or spray with a primer
Followed by paint
If necessary use a hoist to support the engine and take the mount completely off for this treatment
Cure the source of salt spray