Alamarin Jet AJ 160, Operation And Maintenance Manual

Page: 27 / 40

27 Operation and Maintenance Manual
Version 1.5 Version 1.5
4.2.4 Changing the Zinc Anodes
The jet is protected with passive cathodic protection. The functioning of the zinc anodes
is crucial from the point of view of corrosion. The zinc anodes must be changed when
they have worn down to half of their original size. Every aluminum component has been
protected separately with a zinc anode. The places of the anodes are described in chapter
3.5.1.
4.2.5. Adjusting the Impeller
Depending on driving conditions, the impeller wears, and a gap develops between
the duct wall and the tip of the blade. When it expands enough, the jet’s performance
decreases. By adjusting the impeller, the operating life can be prolonged considerably.
The adjustment of the impeller should be done whenever it is necessary, but checking
must be done at least once a year.
Adjusting the impeller is done by removing the impeller and reinstalling it. See next
chapter.
Figure 4.2.6-1
4.2.6. Checking the Seals
The seals to be checked are
e.g. the O-ring seal of the
inspection hatch (A) and the
sealings of the steering shaft
bushings (B) (figures on the
side). When the inspection
hatch seal leaks, it causes
ventilation and the sealings
of the steering shaft bushings
cause water to leak in the bilge.
If water gathers in the bilge,
the cause for this must be
determined immediately and
the possible leak must be
repaired. Water can damage
e.g. the starter motor.
A
B
4.2.7. Maintenance of the Hydraulic System
The reversing deflector hydraulic control system requires maintenance as follows:
- checking the oil level
- checking the condition of the V-belt and replacing it if necessary
- checking the condition of the hoses and replacing them if necessary