Beta Marine Beta 14 Installation Manual page 28

WATERLOCK/SILENCER
17 Waterlock/Silencer Positioning
Always fit a waterlock/silencer to stop any water in the
exhaust system back filling the engine. The water lock
should always be fitted at least 30 cms away from the
injection bend and at least 30 cms below the injection
bend, being as low as practically possible, so that all the
water can drain down into it. The waterlock should have
sufficient capacity to hold an exhaust system full of water
- draining into it.
Always create a 'gooseneck' with the exhaust hose (or
purchase a propriety one) by raising the exhaust hose 40
cms above the waterline before exiting the transom at
least 5 cms above the waterline. This will stop any waves
pushing seawater down the exhaust.
18 Exhaust Hose 'Gooseneck'
With longer lengths of exhaust hose you may need to
support the hose to avoid a drooping hose and water
build up.
L
H
Position of silencer in relation to exhaust hose
length:
Length (L)
30 cm
120 cm
IMPORTANT!
If measurement 'H' cannot be met, a high rise
exhaust injection bend must be installed so
that any residual water flows/drains into the
waterlock/silencer or overboard.
Loops Holding Water
MUST be Avoided!
19 Exhaust 'Gooseneck'
26
Height (H)
30 cm
40 cm
40 cm 40 cm