Hamilton Jet HJ241, Manual

Page: 49 / 202

3.15
3 DESIGN BASICS
3.7 E
NGINE
L
OCATION
& M
OUNTING
HJ-241 / HSRX
3.6.2 Layout of Components
Refer to Drawing CT-HPU-01001 Hydraulic Power
Unit .
3.6.3 Scope of Supply
THE FOLLOWING LIST OF ITEMS ARE SUPPLIED
WITH THE HSRX REVERSE SYSTEM.
1. HSRX Reverse Cylinder.
2. Pump Assembly.
3. Cooler. (Integral part of Jet Unit).
4. Hoses and Fittings.
5. Belts for the Pump.
6. Hydraulic oil.
These items are supplied factory assembled and
mounted on the Jet Unit ready for use.
THE FOLLOWING ITEMS ARE NOT SUPPLIED:
1. Cable or other actuating devices.
3.7 ENGINE LOCATION &
MOUNTING
3.7.1 General
The engine(s) should be located in a position that
will give the vessel the most suitable fore and aft
trim for the proposed boat speed. For semi-planing
and moderate planing speed vessels it is likely that
the engine should be positioned well forward
towards amidships for best trim and thus speed. For
very high speed vessels it is likely the engine should
be positioned aft, close to the Jet Unit, to obtain vest
trim and speed. Follow the recommendations of the
boat designer in this regard or consult C.W.F.
Hamilton & Co Ltd.
3.7.2 Mounting
Mount the engine via mounting feet fixed to the
engine bearers. The feet and bearers do not have to
withstand the propulsion thrust load as this is
transmitted for the Jet unit directly to the hull.
Flexible engine mounts will reduce vibration and
noise but these must be used in conjunction with a
driveshaft system which does not cause a radial or
side load at the Jet Unit Coupling as the engine
moves.
FOR STEEL HULLS:— Ensure the driveline
electrically insulates the engine from the Jet Unit.
3.7.3 Cooling
JET UNIT WATER OFFTAKE:
The Jet Unit incorporates an inboard water offtake
point on the starboard side of the Intake. This is
fitted with a Hosetail / Bung which can be cut off
and a hose connection fitted to the Hosetail. This
provides water at pressures as follows:
TYPICAL MAXIMUM PRESSURE:— 550kPa (80 psi)
at full power.
The water may be fed directly to the engine for
cooling without the need for a raw water pump,
provided that:
• The flow from the water offtake at idle is
sufficient to cool the engine.
• The engine can withstand the maximum
pressure from the water offtake.
To be sure of correct flow for engine cooling a
conventional water pick up and the engine raw
water pump should be used.