Hamilton Jet HJ212, Installation And Service Manual

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Overhaul
Installation and Service Manual
Bearing Housing Assembly overhaul
Refer to drawing: HJ21201000 Base Jet Assembly
Bearing Housing and Water Seal Assembly Dismantling
Overhaul of the bearing housing and water seal with the vessel afloat is not
recommended as water can enter the vessel through the intake opening.
The water seal must be replaced if:
If there have been signs of water leaking from underneath the bearing housing.
Dismantle the bearing housing assembly
The bearing housing can be dismantled to replace the bearing and seals with the
tailpipe in place if necessary.

Remove the tailpipe. Refer to section: Tailpipe Area Dismantling on page 9-22.

Lock the engine to remove the impeller nut and impeller.

Remove the engine.

If the close coupling system is fitted, remove the Borg Warner adaptor [2] by removing the 3 screws [5],
nut [6], flat washer [7] and spring washer [8] attaching the adaptor to the jet unit and sliding the
assembly off forwards. Refer to drawing: HJ21202002 Flywheel Adaptor.

Remove the nuts [17] and spring washers [16] from the 3 studs [43] securing the bearing housing [8] to
the jet unit intake [19].
If the mainshaft is to remain in the jet unit, remove the inspection cover [20] and
remove the water seal retaining pin [15] from the mainshaft [1] rearward of the water
seal [50], to release the spring tension off the water seal.

Now the complete mainshaft [1], bearing housing [8], bearing [7] and water seal assembly [14] can be
removed by easing the mainshaft forward.

The mainshaft should not be pulled because it may crush the water seal carbon face [3]. Instead drift the
water seal assembly forward by tapping the seal face holder [12] from the outside the rear of the jet,
with a wooden drift.

Ensure that the mainshaft and bearing assembly are supported as it comes free. The mainshaft, bearing
and seals can now be removed to a workbench.

Back off the bearing retaining nut set screw [44].

Use a suitable splined coupling to lock the mainshaft [1] to prevent it from turning while loosening the
bearing retainer nut [9].

Loosen the bearing retainer nut [9]. The water seal spring may push components forward as this is done.

Remove the coupling from the mainshaft splines.

Remove the bearing nut by engaging it with the spline on the mainshaft and sliding it forward off the
mainshaft.

Carefully remove the bearing housing [8], with the bearing [7], bearing carrier [3] oil seal [6] and seal
sleeve [5].

These items will probably come off together. One half of the bearing inner race will probably remain
attached to the mainshaft. Remove this and keep it with the bearing.

Remove the bearing [7] and seal [6] from the bearing housing [8]. Do not swap the bearing inner races
halves. Keep the bearing clean.

Remove the bearing sleeve [3] from the mainshaft.
9-18