Mike, I was on the fence about that one. Typically you experience hydrolock
symptoms at least some times with water coming back through the exhaust. If
the boat was used as an overnighter that might increase the possibility. A
lot of factors have to happen just right to get water through the exhaust
and past the rings without the operator noticing it when they try to start
the engine.

Do you know if volvo makes riser extenders similar to the merc ones? Their
manifolds look a lot like mercs. If that's the problem then the fix is
fairly straight forward. Also makes the problem entirely Larson's, Volvo
has not control over engine placement relative to the waterline beyond
recomendations which I'm sure they make.

Ralph, here's what the riser extenders look like for merc. You can see they
are simply blocks with the correct passsages designed to go between the
manifolds and the risers. They raise the exhaust riser for situations where
the boat engine sits low in the hull. It keeps the riser far enough above
the waterline to keep water from entering the exhaust while the engine is
off. If I were at a dealer I'd be tempted to just put one agains a volvo
riser to see if the pattern is the same. I know next to nothing about volvo
so I don't know if they have their own riser extenders. Volvo has the
advantage of being better engineered, merc has been around forever. Due to
overwhelming numbers they have had to confront a lot of real world problems.

http://www.perfprotech.com/Home/Tech...0manifolds.htm


"CaptMP" wrote in message
...
Risers are too short for the engine/hull configuration. You'll never get
the
dealer to admit it, but check around with other owners of your hull/engine
combo in your area and see who else has the same tbl.
Best of luck
Mike