Bilge Siphon
The Mercury Jet Drive incorporates an automatic bilge siphoning feature. The
bilge siphon is working whenever the engine is running above idle speeds.
Maximum performance of the bilge siphon is realized above 3000 RPM.
a - Siphon break
b - Bilge siphon hose
c - Bilge water pickup screen
Water exiting the jet pump nozzle creates a suction or vacuum in the hose
attached to the nozzle. The hose is routed to and positioned in the bilge on the
side of the jet tunnel.
The bilge siphon system incorporates a siphon break, which prevents water
from siphoning back into the boat when the engine is turned off. This siphon
break must be located at the highest point of the hose routing and must be
above the waterline.
The siphon break requires periodic inspection to ensure proper operation. The
508 mm (0.020 in.) air hole must remain open and free from obstruction.
Warning System
WARNING HORN SIGNALS
When the key switch is turned to the "ON" position, the horn will turn on for a
moment as a test to indicate the horn is working.
There are two types of warning horns to alert the operator of an active problem
within the engine’s operating system.
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