Engine Systems; Exhaust Systems; Governor Settings - Hamilton Jet HJ241 Manual

3 DESIGN BASICS
3.7 E L & M
NGINE OCATION
If a gearbox or clutch is fitted to
the engine, a conventional hull
water pick-up and engine raw
water pump must be used.
C
AUTION
The Jet unit water offtake can be used for a deck
cleaning hose but the pressure is not high enough
for a fire hose.
CONVENTIONAL WATER PICK-UP:
Ensure that the engine cooling
water pick up is not directly
ahead of the Jet Unit Intake, but
well to the side to avoid turbulent
C
AUTION
water flow into the Jet.
Alternatively a cooling system separate from the Jet
Unit can be fitted to the engine maker's
specifications. The water pick up points must NOT
BOAT GOING
ASTERN
EXHAUST GASES
WATER
ONLY

3.7.6 Governor Settings

Refer to Section 5.6.5 Governor
3.16
OUNTING
EXHAUST OUTLETS
CHINE
Figure 24: Exhaust System Layout
Settings.
be directly ahead of the Jet Unit intakes and should
be well to the side of the area forward and the same
width as the intake opening.

3.7.4 Engine Systems

Engine wiring, instrumentation and throttle systems
are all conventional. Follow the manufacturers
recommendations.
WITH STEEL HULLS.—Ensure the controls do not
electrically connect the Jet Unit to the hull.

3.7.5 Exhaust Systems

The engine exhaust system can be any conventional
system approved by the engine manufacturer.
Engine exhausts should be sited above the waterline
and away from the Jet Units.
If engine exhausts are located near the Jet Units,
water containing exhaust gases can be ingested by
the Jet Unit when the vessel is moving astern. This
can cause loss of thrust and control of the Jet Unit.
WATER LINE
BOAT GOING
ASTERN
KEEL
WATER
FLOW
HJ-241 / HSRX
EXHAUST OUTLETS
CHINE
KEEL
EXHAUST
GASES