Hamilton Jet HJ212 Installation And Service Manual page 103

Installation and Service Manual
Lightly grease the forward seal sleeve [5] and slide it onto the mainshaft up to the outer seal [6]. Press
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the forward seal sleeve [5] through the outer seal [6] until it is pressed firmly against the front of the
bearing [7].
Note the location of the drilled recess in the mainshaft thread for the bearing lock nut set screw [44].
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Replace the bearing retaining nut [9], hand tight only, this will be tightened once the water seal is located
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in position.
Slide the new water seal rotary assembly [3], [4] and [5]. Forward into place against the stationary face
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fitted in the rear of the seal face holder, take care not to crack the carbon face [3]. Refer to drawing:
61500 Water Seal.
Move the water seal spring [6] and spring cap [7] aft out of the way, reach inside the seal face holder [12]
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from the aft and gently slide the rubber bellows [4] fully forward on the mainshaft, the bellows will
eventually bond itself into place onto the mainshaft. Ensure it is in a compressed state so that it will be
able to stretch as the seal face wears.
Compress the new spring [6] and spring cap [7]. Refer to drawing: 61500 Water Seal. until the retaining
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pin hole in the mainshaft is visible.
Insert the water seal retaining split pin [15] through the hole in the mainshaft, ensuring that the legs of
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the retaining pin are folded close against the mainshaft to avoid fouling with the seal face holder [12].
Release the spring [6] and spring cap [7] and allow them to seat against the water seal retaining split pin
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[15].
Fit the spring washers [16] and bearing housing retaining nuts [17] onto studs [43] and tighten hand tight
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only.
Ensure that the mainshaft is supported during torque loading so that the bearing [7] is not overloaded.
Both the impeller nut and bearing retaining nut will both be tightened together. Alternatively fit the coupling to
the jet mainshaft splines and restrain the coupling to prevent the mainshaft rotating while the bearing nut [9] is
tightened to the recommended torque.
Tighten the bearing retaining nut [9] and torque load to 240Nm (177lbf ft).
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If possible, align one of the two set screw holes in the bearing retaining nut [9] with the drilled recess in
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the mainshaft. If the hole in the retaining nut does not align with the drilled recess, another recess may
need to be drilled in the mainshaft. There are two holes in the retaining nut to choose from. Use a 5mm
long series drill. Ensure that the recess is drilled no deeper than 3mm deep. Clean off all swarf and
deburr the recess.
Replace the bearing lock nut set screw [44] in the bearing retaining nut and tighten to 8Nm (6lbf ft).
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The bearing housing retaining nuts [17] can now be torque loaded to the recommended torque. Refer to
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section: Tightening Torques on page 10-28.
Turn the mainshaft by hand to ensure that it turns freely.
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Grease the bearing [7] at the grease nipple [18] using a grease gun and a recommended bearing grease.
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Pump the grease into the bearing whilst turning the mainshaft until the grease begins to emerge from
around the entire circumference of the forward seal [6]. With the engine idling, pump in more grease to
ensure the bearing housing is full.
Lightly coat the splines of the mainshaft with a marine grease.
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If the tailpipe and impeller have been removed they can now be refitted. Refer to section: Tailpipe and
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Impeller Reassembly on page 9-31.
Refit the driveshaft and engine.
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If the impeller and tailpipe have been removed, refit the impeller and tailpipe. Refer to section: Tailpipe
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and Impeller Reassembly on page 9-31.
Put the vessel in the water and run the jet unit. Check that the water seal is not leaking.
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9-21
Overhaul