I usually don't post same info on 2 different forums
, but subject came up on other forum few days ago so below is copy and paste.
Would add that one must keep up with zincs, easily done in water with 2 piece zincs around saildrive.
Happy New Year All!
Have Yanmar SD20 with folding prop on my 30" sloop
, saildrive is 27 years old. No leaks
, original seals...wanted to change seals
several times just because, yanmar dealer says not needed and
cited older units still going strong with original seals.
Am coastal sailor and would change seals if going offshore
did not know history
of older unit.
Have gone bump in the night few times, one time sailing over a
substantial submerged tree with no problem. Saildrive sits somewhat protected behind keel
, would rethink if more exposed
as could be on a catamaran
Makes for very quiet motoring with no vibrations transfered to hull and bilge
is dry as no shaft seal
leakage and no critical shaft line
up. My install my be somewhat unique as motor
is turned 180 degree from normal install and presents easy access for inspection
of saildrive seals and gear oil
Almost forgot, there are actually two robust watertight seals
that have a sensor between them that sounds an alarm
any water ingress. Alarm
has never sounded other than when I
remove and test. There is a 3rd exterior seal/rubber flap not
water tight on the bottom of the hull/ saildrive leg that keeps
One has to be careful about keeping raw water
intake open and I have installed a 3 way valve to another thru hull
if needed, i don't need to use but am very careful about keeping bottom/saildrive clean.
All in all am happy with yanmar sd20 saildrive, which are still made today...can not speak to Volvo drives...and certainly aware that many are not fans of saildrives.
Maybe some will speak to their personal experiences with their
particular makes and models.
Beware of experts with no first hand experience/knowledge in all things small and large.
Hope this helps,