Hamilton Jet HJ241, Manual

Page: 127 / 202

9.23
9 OVERHAUL
9.7 T
AILPIPE
A
REA
- O
VERHAUL
HJ-241 / HSRX
3. Remove the Insulator [38] and thoroughly clean
and degrease the Tailpipe Bore.
PREPARING A NEW WEAR RING FOR FITTING:
1. Before fitting a new Wear Ring, it should be trial
fitted into the Tailpipe bore with No Insulator
Fitted .
2. There should be a gap of approximagely 1mm
between the mating ends of the Wear Ring with
the Wear Ring completely fitted into the Tailpipe
bore.
3. The Wear Ring may not fit without some “dress”
filling of the mating ends to reduce the
circumference slightly.
DO NOT REMOVE TOO
MUCH METAL FROM THE WEAR RING as the
Wear Ring must be a tight fit in the Tailpipe once
the Insulator is fitted. This ensures that the Wear
Ring remains in the correct position during
operation.
FITTING A NEW INSULATOR:
1. Paint the Tailpipe Bore with a thin layer of two
pot vinyl etch primer suitable for Aluminium and
allow to dry.
2. Apply a coat of zinc phosphate epoxy primer.
(such as International Paints Intercure 200 HS )
and allow to dry.
3. Apply a second coat of zinc phosphate expoxy
primer. While the primer is still wet , fit in a new
Insulator [38] into the Tailpipe, ensuring that the
Insulator is in contact with the primer over the
whole surface.
4. Smear the complete insulator surface with a thin
layer of grease or oil.
FITTING A NEW WEAR RING:
STEP 1:
1. Take a new Wear Ring [37] and with the chamfer
end leading, butt the strip at the chamfers by
twisting slightly, (this reduces the lead in
diameter)
(See ‘Step 2 Insertion’ in Figure 31:
Wear Ring Inspection & Removal Instructions ).
2. Gradually feed it inside the Insulator [38] fitted in
the Tailpipe until it butts fully. (See ‘Step 3
Insertion’ in Figure 31: Wear Ring Inspection &
Removal Instructions ).
3. Slide the Wear Ring in evenly as far as possible
by hand.
STEP 2:
4. Place a heavy steel plate against the edge of the
Wear Ring (The plate is used to prevent damage to
the end of the Wear Ring and should cover whole
diameter of Wear Ring)
.
5. Drive the Wear Ring evenly into the Tailpipe
recess by hitting the plate with a large hammer.
6. Continue pushing the Wear Ring into the Intake
until the Wear Ring sits approximately 0.8 mm
(1/32") from the end of the recess in the
Tailpipe. Refer to Figure 33: Wear Ring Aft Posi-
tion .
7. The Wear Ring must not touch any part of the Jet
Unit except the Insulator.
8. The Wear Ring is correctly fitted when it
protrudes by 2 mm from the forward end of the
Tailpipe.
NOTE: The Wear Ring is in the correct position
when it is located approximately 0.8 mm (1/
32") from the end of the recess in the
Tailpipe
Figure 32: Wear Ring Forward
Position and the Wear Ring protrudes by up
to 2 mm from the forward face of the
Tailpipe.
Figure 33: Wear Ring Aft Position.
This gap must be maintained to prevent
electrical contact between the Wear Ring and
the Tailpipe / Intake of the Jet Unit.
9. On completion of the fitting of the Wear Ring,
electrical insulation between the Wear Ring and
the Intake Casting chould be check using a
multimeter.
The resistance reading should be
over 1000 ohms.
Figure 32: Wear Ring Forward Position