Westerbeke 50 - Page 113

V.28
Hydro-Hush Muffler Installations
Page 2
Use as few right angle fittings as possible. The use of wire reinforced
hose is recommended and the hose should be routed to produce the bends
needed.
The use of 90° and 45° fittings contribute to the rise of engine exhaust
back pressure. (Refer to the Unit Technical Manual for back pressure
specifications.)
The exhaust hose diameters shown are minimums. Exhaust hose diameter for
the discharge
hose will have to be increased if the length of run from
the Hydro-Hush Muffler to the thru-hull discharge is excessive (25' to 30'
depending on the number of bends).
CAUTION
THE SEA WATER PUMP WILL CONTINUE TO FILL THE EXHAUST SYSTEM WITH
SEA WATER DURING CRANKING. THE ENGINE EXHAUST PRESSURE DURING
CRANKING ~~Y NOT BE STRONG ENOUGH TO EXPEL THE WATER FROM THE
MUFFLER AND PREVENT THE SYSTEM FROM FILLING UP WITH SEA WATER
AND ENTERING THE EXHAUST MANIFOLD AND CYLINDERS.
IF ENGINE CRANKING EXCEEDS 30-40 SECONDS APPROXIMATELY, CLOSE
THE SEA WATER THRU HULL AND OPEN IT IMMEDIATELY AFTER THE ENGINE
STARTS.