Hmmm....a trolling motor uses a single seal and no depth compensating
bellows.

Still, for decent depths, rather than the shallow depths the
questioner mentioned, this would be a sensible suggestion.
Either way, lip seals
have lips facing the higher pressure side, to prevent lift off, or
they face both ways in some applications....

Brian Whatcott Altus OK

On Sun, 23 Nov 2003 19:56:48 GMT, Rick
wrote:

Brian Whatcott wrote:

Place three in series in the housing, and fix the housing on the motor
in some waterproof way. This will put you in with a chance.

That is not a very promising approach.

If keeping the motor dry is important, filling the housing with a light
oil under slight positive pressure via a compensating bellows is the way
to go. A standard lip seal will keep junk out and the oil in. The
compensating bellows will allow operation to any depth with no fear of
flooding the housing.

Rick