Hamilton Jet HJ212, Installation And Service Manual

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Installation
Installation and Service Manual
Final Assembly
The tailpipe, steering nozzle and reverse duct can now be refitted.
Refer to the appropriate area in the overhaul section and assembly drawing for details
Engine 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 from the jet
unit directly to the hull.
Flexible engine mounts will reduce vibration and noise but must be used in conjunction with a driveshaft
system which does not cause radial or side loads at the jet unit coupling as the engine moves.
Engine installation
Due to certain engine components fouling on the jet unit intake, the 454 Chev
Mercruiser engine cannot be mated to the HJ212 jet unit using a Centaflex coupling.
C.W.F Hamilton & Co Ltd recommend the use of a H-bar type coupling in preference to the Centa coupling
arrangement for the 454 Chev Mercruiser engine. Refer to drawing: HJ21202004 H-Bar Drive Coupling.
The engine(s) should be located in a position that will give the vessel the most suitable fore and aft trim for
the proposed vessel speed. For semi-planing and moderate planing speed vessel, the engine should be
positioned well forward towards amidships for best trim and speed. For very high speed vessel, the engine
should be positioned aft, close to the jet unit to obtain best trim and speed. Follow the recommendations of
the vessel designer in this regard or consult C.W.F. Hamilton & Co Ltd.
Driveline and Engine Installation
Close coupling option
In vessels designed for higher operational hours and severe use e.g. tourist boats operating in
narrow, shallow rivers, the H-bar type drive shaft or companion flange plus Cardan shaft must
be used.
This is to isolate the jet unit from possible high engine inertia forces associated with extreme
manoeuvres or groundings.
Refer to drawing: HJ21202005 Close Coupling Kit.
This option allows the engine to be mounted as far aft as is possible. It has the advantages that the driveline
is completely enclosed and because of the flexibility, it is quiet.
The close coupling kit can be purchased from C.W.F Hamilton & Co Ltd with the jet unit. It allows the rear
engine mount to be on the jet unit through a Borg Warner compatible engine mount adapter [2] mounted on
the engine bell housing. This incorporates resilient mount o-rings [4] as mount rubbers. These sit on the jet
unit bearing housing and the assembly is secured in position by the engine mount cap [3].
The option includes a flexible Centa coupling which is mounted directly to the engine flywheel via an adaptor
plate. Adaptor plates for Ford and Chev engines are available from C.W.F. Hamilton & Co Ltd. Refer to
drawing: HJ21202002 Flywheel Adaptor.
The jet unit mainshaft spline fits into the centre of the flexible coupling, giving the shortest possible driveline.
While this option allows the furthest aft mounting of the engine, it has been designed to accommodate later
model Ford and Chevrolet engines. It is important to check that any particular engine will in fact fit above the
jet intake without the sump or sump plug fouling on the intake. If fouling is going to occur, then the choices
are to use a different engine, use the H-bar coupling option, or modify the engine sump with the engine
manufacturer’s approval.
If the engine to be fitted is a 7.5ltr Ford, a special bell housing must be obtained. Consult
with C.W.F Hamilton & Co Ltd for sources.
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