Hamilton Jet HJ241, Manual

Page: 126 / 202

9.22
9 OVERHAUL
9.7 T
AILPIPE
A
REA
- O
VERHAUL
HJ-241 / HSRX
3. Unscrew and remove Nuts [17] and Spring
Washers [16] from the Studs [30] securing the
Intake to the Tailpipe.
4. Hit the Tailpipe sideways with the heel of the
hand or a rubber mallet to free the joint.
5. Gently ease the Tailpipe [41] aft off the Studs [30]
and slide it carefully off the Impeller. The
Impeller and Impeller Nut is now exposed.
IMPELLER REMOVAL:
6. Fit the Reaction Arm to the Coupling Flange to
prevent the Mainshaft from turning and unscrew
the Impeller Nut [10].
7. Remove the Impeller Nut [10] from the rear end
of the Mainshaft.
8. Remove the Water Bearing Sleeve [4].
9. The Impeller can be withdrawn off the Mainshaft,
ensuring that the Key [11] is also removed.
9.7.3 Inspection of the Tailpipe
Marine Bearing and Wear
Ring
With the Tailpipe removed from the Jet Unit
Intake as shown in
Section 9.7.2 Tailpipe Area -
Dismantling , carry out the following actions:-
1. Marine Water Bearing Sleeve [4]. Check the
condition of the Marine Bearing, if it is badly
scored or worn, it will have to be extracted from
the Tailpipe and replaced.
Refer to Section 9.7.7
Tailpipe Overhaul.
2. Tailpipe water drain hole. Check that the water
drain hole in the centrew of the tailpipe cone is
not blocked. Clear any blockage found.
3. Wear Ring [37] and Insulator [38]. Check for
wear on the Wear Ring. This should be evident
where the Impeller has been running. If there is
evidence of excessive wear by a 0.5mm lip, or
signs of corrosion through or beneath the Wear
Ring. The Wear Ring and Insulator should be
replaced.
Refer to Section 9.7.4 Wear Ring and In-
sulator Removal and Replacement.
4. Insulation. Check the Insulation between the
Wear Ring and the Tailpipe Casing. Using a
multimeter. check the insulation between the
Wear Ring and the Tailpipe Casing. If the
insulation has broken down, corrosion will occur
beneath the Wear Ring. The Wear Ring and
Insulator should be replaced as shown in
Section
9.7.4 Wear Ring and Insulator Removal and Re-
placement.
5. Stator Blades. Check for signs of damage or
erosion to the leading edges. Dress off any burrs.
6. Plug [36] (On Tailpipe). Check the Water-
Offtake Screen by removing any stones from the
filter holes.
9.7.4 Wear Ring and Insulator
Removal and Replacement
WEAR RING AND INSULATOR REPLACEMENT:
STEP 1:
1. Find the joint in the Wear Ring [37] and force a
long thin screwdriver between the Wear Ring
[37] and the Insulator [38], adjacent to the Wear
Ring joint, until the end of the Wear Ring is free.
(See ‘Step 1 Removal’ in Figure 31: Wear Ring In-
spection & Removal Instructions ).
STEP 2:
2. Pull the free end of the Wear Ring inwards and
remove it from the Tailpipe. (See ‘Step 2 Removal’
in Figure 31: Wear Ring Inspection & Removal In-
structions ).
Figure 31: Wear Ring Inspection & Removal Instructions
STEP 1
START
INSERTION
1
REMOVAL
2 3
STEP 2