Alamarin Jet AJ 340, Operation And Maintenance Manual

Page: 22 / 50

Maintenance
Operation and maintenance manual
18 KHO/340/EN/1.0.0.
the propulsion unit can be painted with antifouling paint after installation.
Generally speaking, antifouling paints are based on various soluble
substances, such as copper. Because the propulsion unit is made mainly of
aluminium, copper forms a highly unfavourable galvanic couple with the
propulsion unit. In other words, the aluminium starts to corrode because it
functions as an anode.
WARNING!
Familiarise yourself with antifouling before painting the
propulsion unit with antifouling paint! Painting the propulsion
unit with antifouling paint that contains copper will result in
heavy corrosion and destruction of the propulsion unit. Do not
use any other antifouling paints for painting the propulsion
unit except those intended for aluminium surfaces.
A boat bottom made of reinforced plastic can be painted using antifouling
paint that contains copper. In this case, leave a 50 mm (2") unpainted area
around the propulsion unit in the stern and on the bottom of the boat (figure
12).
Figure 12. Antifouling
A Unpainted area
B Painted area
CAUTION!
Do not paint the anodes or their fastening screws.
4.3. Bearing
The jet's bearing is very simple. There are bearings at both ends of the direct
shaft. The structure of the front bearing (figure 13, point A) is receptive to
axial pressure. It also carries the radial loads caused by the weight of the shaft
and the parts attached to it. At the rear end, the shaft is supported either by a