Tailpipe Area Dismantling; Tailpipe, Marine Bearing And Wear Ring Inspection; Wear Ring Removal And Replacement - Hamilton Jet HJ212 Installation And Service Manual

Installation and Service Manual

Tailpipe Area Dismantling

Refer to drawing: HJ21201000 Base Jet Assembly.
Remove the nuts [17] and spring washers [16] from the studs [30], securing the tailpipe to the intake.
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Remove the tailpipe [41] complete with the marine water bearing [2], off the studs [30] and slide the
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tailpipe carefully off the impeller. The impeller is now exposed.
Lock the engine or driveline to prevent it turning while removing the impeller nut [10].
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Using a large socket wrench, remove the impeller nut [10], ensuring that the mainshaft [1] is supported
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during impeller nut removal to prevent overloading of the main bearing [7].
Remove the water bearing sleeve [4].
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The impeller can now be withdrawn off the mainshaft.
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Remove the impeller key [11] from the key-way in the mainshaft.
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Tailpipe, Marine Bearing and Wear Ring Inspection

With the tailpipe [41] removed from the jet unit intake, do the following:
Check the condition of the marine bearing. If it is badly scored it will have to be removed from the
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tailpipe and replaced.
Check the wear on the wear ring [37]. This should be evident where the impeller has been running. If
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there is evidence of bad wear, by a 0.5mm lip in the wear ring, or there is evidence of corrosion through
or under the wear ring. The wear ring should be replaced.
Using a multimeter, make sure that there is no electrical connection between the wear ring and the
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tailpipe casing. This could cause corrosion under the wear ring. The wear ring and insulator should be
removed and replaced.
Check the water off-take filter by removing the bung [36]. Remove any stones in the filter holes.
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Check the condition of the o-ring [47] fitted to the bung [36]. Replace if damaged, perished or deformed.
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Check for signs of damage or corrosion to the leading edges of the stator blades.
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Dress off any burrs as necessary.
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Check the anode(s) for wear and replace if necessary. Refer to section: Anode Replacement on page 9-4.
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Wear Ring Removal and Replacement

Only replace the wear ring if it is excessively worn, or bulging inwards. This could indicate
corrosion build up underneath the wear ring.
9-23
Overhaul