WaIIy wrote in
:

I've read your story before and I am guessing that the connection from
the engine to the shaft seal is below the waterline where it attaches to
the engines.

Correct. The engine room in this 41' ketch under the center cockpit is
very deep and underwater. When the backflow finally filled up the waterbox
muffler, exhaust hoses and into the exhaust manifold, it fed back into the
exhaust valves into the cylinders it could get to.


I installed two PSS seals on my boat (twin 5.7's) and the fitting I put
on the manifold is quite a bit above the waterline.

Your engines are above the waterline, at least the heads are.


I can't see, in my case, how a backflow could possibly occur.

It probably can't in a fast boat so shallow with the engines so high up.
Ours is a displacement boat with a 6.5' draft and very deep bilges.


You have to keep your eyes on these seals though. Debris can get in
there and cause a leak.


The water injection line connects to the SEAWARD side of the seal. If you
ever have the line off, just lay it in the bilge under the waterline and
watch it back up.... It's fully exposed to the sea behind the seals.

--
Larry