Hamilton Jet HJ241, Manual

Page: 97 / 202

8.11
8 MAINTENANCE
8.5 S
ERVICING
D
ETAILS
HJ-241 / HSRX
If excessive wear or damage has been found, then
undertake appropriate overhaul as described in
Section 9 Overhaul . Schedule the next maintenance
period to suit the conditions found during this
inspection, using the following guidelines:
• Decrease the time between each maintenance
interval the if amount of dirt and sand in the
water increases.
• Increase the time between each maintenance
interval if amount of dirt and sand in water
decreases.
• Decrease interval if excessive wear was found
in the Jet Unit internal inspection (Item 17
above).
• Increase interval if minimal wear was found at
the Jet Unit internal inspection (Item 17
above).
17
(Cont’d)
Jet Unit
(Contd) i) Jet Unit Paintwork.
• The main body of the Jet Unit is constructed from Silicon-
Aluminium Alloy (LM6) which is resistant to corrosion from
salt water. The castings are finished in a polyurethane paint.
Periodic cleaning down, wire-brushing and repainting may
be necessary depending on water conditions prevailing and
extent of use.
• When the vessel is on the slip, preferably annually, the
complete Jet Unit should be inspected internally and
externally for faults, corrosion, or breakage's. Clean down
and repaint the castings where necessary.
j) Refit Components.
• Refit components in accordance with Section 9 Overhaul of
this Manual. Follow the recommendations on Drawing
85113 Recommendations for Fastener Locking, Torques and
Threading Lubrication Sht 1
, and Section 8.7 Threaded Fasten-
ers , for thread tightening torque's, joint lubrication, thread
and joint locking, Bearing Housing lubricants and hydraulic
fluids.
k) Insulation Checks (Steel Hulls Only)
• Monthly , carry out Insulation Checks in accordance with
Section 4.3.1 Checking the Insulation.
ITEM NO ITEM OPERATION
C
AUTION
For Steel Hulls
the Jet Unit must be totally electri-
cally insulated from the Hull. For
Steel Hulls, insulating hardware is
supplied with the Jet Unit. The
insulation should be checked
before finally bolting the Jet Unit
and Transom Seal assembly in
place and again on completion of
the Jet Unit and Transom Seal
assembly.