Hamilton Jet HJ241, Manual

Page: 125 / 202

9.21
9 OVERHAUL
9.7 T
AILPIPE
A
REA
- O
VERHAUL
HJ-241 / HSRX
26.Fit the Coupling Nut [10] to the Mainshaft.
27.Fit the Reaction Arm Tool to the Jet Unit Coupling
to prevent the Coupling from turning. Torque
load Coupling Nut [10] to
275 Nm (200 ft/lbs).
28.Refill the Bearing Housing with an approved
bearing grease. This can be carried out using the
Grease Nipple [18] on the top of the Bearing
Housing.
(Drawing HJ-241-01-000 Basic Jet As-
semblies Standard and Dry Run Sht 1 refers).
29.Whilst slowly rotating the Mainshaft, lightly
grease the Bearing via the Grease Nipple [18] on
the top of the of the Bearing Housing. Continue
adding grease until the grease is seen to escape
between the outer Seal Sleeve [5] and the outer
Seal [6]. Wipe off any excess grease.
30.Turn the mainshaft by hand to ensure that it
rotates freely before connecting the Coupling to
the driveshaft.
31.Put the vessel in the water and run the Jet Unit to
check that the Water Seal is not leaking.
9.7 TAILPIPE AREA - OVERHAUL
Refer to Drawing HJ-241-01-000 Basic Jet Assem-
blies Standard and Dry Run Sht 1 & 2
If the Reverse Duct has not already been removed, it
must be removed before proceeding.
Refer to Section
9.2.1 Reverse Duct Removal.
If the Steering Linkages have not already been
disconnected, they must be disconnected before
proceeding.
Refer to Section 9.4.2 Steering Shaft Re-
moval.
9.7.1 Impeller - Checking for Wear
Before dismantling the Tailpipe end of the Jet,
remove the Inspection Cover [20] (or Intake
Screen [24] if in dry dock) and carry out the
following checks :
1. Impeller Tip Wear Check:
Using feeler gauges, check clearance between the
tips of the Impeller Blades and the Wear Ring [37]
at each side of the Unit
(i.e. not top and bottom).
Maximum recommended worn clearance is 1.1 mm
(0.043 ins) per side.
2. Water Bearing Wear Check:
Push the Mainshaft [1] hard from side to side.
Check total sideways movement at the blade tips.
Maximum recommended worn total movement is
0.5 mm (.020 ins per side).
This indicates the
amount of wear in the Water Bearing [2] and
Bearing Sleeve [4].
9.7.2 Tailpipe Area - Dismantling
Refer to Drawings HJ-241-01-000 Basic Jet Assem-
blies Standard and Dry Run Sht 1 & 2 .
DISMANTLING:— If the Tailpipe is being removed
complete, proceed as follows, otherwise refer to
Section 9.4.2 Steering Shaft Removal for the removal
of the Steering Components.
1. Ensure that the procedures shown in Section
9.2.1 Reverse Duct Removal and Section 9.4.2
Steering Shaft Removal of this Manual have been
carried out to remove the Reverse Duct and the
Splash Guard [7] and to disconnect the Steering
Shaft and Steering Control Cable / Steering
Cylinder.
2. Ensure that the Steering Shaft has either been
withdrawn from the Steering Bush located in the
Tailpipe or completely removed from the Jet Unit.