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I don't know what kind of outdrives you have, but the problems you
mentioned are not unusual.
Loose engine mounts or misaligned mounts canb cause stress/wear on
your outdrive or transmission/prop shaft. Mounting screws and bolts can
pull out of the enfine beds, or the rubber can deteriorate and/or
fail with age and oil/gasoline/diesel getting on them. Leaking exhaust
hoses can be from the hoses getting old and starting to fail or from
the clamps being too loose or from the exhaust hose fitting corroding
away because the aluminum is deteriorating.
The drive shaft splines aren't all that unusual depending upon
age/hours of use.a little rust on the splines, coupled with the
vibration/moytion from bnormal use will do a number on the splines in a
short time- the main drive shaft on my OMC I/O has to get replaced over
the winter.
If you have a few years/hours on the boat- I'd say it sounds like
the normal I/O maintenence for a salt water boat- the vibration could
be anything- but likely a plug or plug wire or ignition. If you got
a few seasons on the engine- could be a burned valve.
I would have another mechanic look at the engines- have you had a
compression test?
Without knowing age/history it's hard to comment any more
Dick
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