"JamesgangNC" wrote in message
nk.net...
Try something flexible that you can push up the relief hole that is
clogged. Maybe a big piece of the flap is stuck down there.

The only way to get better access is to take off the Y pipe and to do that
you need to pull the engine. Hope it doesn't come to that.

"ToneJohn" wrote in message
...
I just posted and tried the info given.. Have a Mercruise 5.7 L engine..
The exhaust flaps on one side were burnt off. I know there is a jam on
the one side because all of the water comes out on the other side, plus i
can spray water up from the out drive on the one side but not the other.
Here is what i have tried to free the debris 1) spray water down the
exhaust pipe on both sides 2) spray water up the pipe from under the out
drive 3) tried a pressure washer also. My hand only goes down to where the
pipe bends and connects from the other side....

Suggestions please...

THANKS! ! !


If the flap burned off then there is exhaust but no water! The riser is
where water is directed into the exhausts (there is no Y pipe unless you
have thru the prop exhaust) on both sides of the engine, you need to look at
that and back to where they (the two risers water pipes) join. There is a
valve assembly with two springs that tries to keep an even flow of water out
the two pipes so what happened doesn't happen. This valve causes problems
if stuck or one of the springs breaks.