Hamilton Jet HJ212 Installation And Service Manual page 43

Installation and Service Manual
Jet unit mounting
Check the following:
Check that the intake block is faired to the hull bottom. Contours should be smooth with no steps or

protrusions greater than 2mm.
There are no flow obstructions forward of the intake block. Refer to figure: Mono hull design on page 3-

2.
Check for distortion or gaps between the intake block and the intake base flange.
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The marine sealant between the intake block and the jet intake flange (and insulating gasket if used) has
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not squeezed out into the water passage. Trim off any excess sealant if necessary.
The engine exhausts are above the expected waterline or well clear of the jet units.
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The hull trim tabs (if fitted) will not interrupt reverse flow from the jet units.
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For GRP hulls
Make sure that continuity strap has been fitted between the transom plate and the jet unit.

Check for electrical continuity between the transom plate and the intake.
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Jet unit, general
Check the following:
Make sure that the impeller is fitted to match the engine rating. The impeller part number (stamped on

the impeller hub) can be viewed through the main inspection cover.
If applying antifoul to the wetted surfaces of the jet unit, make sure that it is compatible with aluminium

(i.e. not copper based).
All inspection cover o-rings and gaskets are correctly located, greased and that the securing nuts are
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tightened to the recommended torque.
The bearing housing has been filled with the recommended grease before to operating the jet unit for

the first time. Refer to section: Recommendations for Lubricants and Oils on page 10-34.
Any water off-take connections (if fitted) are correctly fitted and secured, unused water off-takes are

correctly plugged.
Internal and external anodes are in place and have not been painted over.
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Drive shaft
It is recommended that the driveshaft is inspected by a qualified driveline specialist.
Make sure that the driveline details have been checked and approved by CWF Hamilton & Co Ltd.

On jet units fitted with close coupling kits, ensure that the dimension around the coupling flange is the

same within 0.25mm at all points around the flange. Adjust the engine mounts to achieve this. Refer to
drawing: HJ21202005 Close Coupling Kit.
On jet units fitted with a "H-bar drive coupling" check the following:
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Yoke offset angles are in the same plane, are equal and less than 5°.
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Yokes are in the same plane.
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Refer to drawing: HJ21202004 H-Bar Drive Coupling.
When installed in a steel hull, make sure that the driveshaft maintains electrical isolation of the jet unit from
the hull (resistance greater than 1000Ohms).
The steering linkage rod ends and clevises are all aligned in the same plane, inboard and outboard.
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5-5
Installation