Tail Piece And Zinc Anode; Checking Cathodic Protection; Zinc Anode Replacement - Vetus BOW4012 Maintenance And Warranty Manual

2.3

Tail piece and zinc anode

Lubrication
The bow thruster tailpiece has long-term lubrication. Therefore oil
change is not necessary.
2.4

Checking Cathodic Protection

On the thruster tail piece (the gearbox un-
der water in the thruster tube) a zinc anode
is installed. This zinc anode will be dissolved
(sacrificed) by electrolysis to prevent corro-
sion of the bronze tailpiece and the propel-
ler shaft. The speed at which the zinc anode
is dissolved depends on the temperature
and the type of water (salt or fresh) and stray
current in the water around the boat either
2.5

Zinc anode replacement

Bow thrusters with tube diameter
• Remove the propeller.
• Remove the screws from the zinc anode and
remove the zinc anode.
• Install the new zinc anode, install the new zinc
anode after application of thread lock (Loc-
tite®).
• Clean the propeller shaft, grease it with 'out-
board gear grease' *) and reassemble the pro-
peller on the shaft.
*) A suitable grease is VETUS 'Shipping Grease' ,
Part number: VSG.
For a part number of a replacement zinc anode
(c/w mounting screws), see page
'Replacement parts' , or consult the 'Service Parts'
page in your bow thruster manual.
• Remove mounting bolt (1) and zinc anode (2).
• Then remove in order the nut, washer and propeller (3), the key (4)
and the V-ring (5).
• Clean the propeller shaft and grease the running surface of the V-
ring with 'outboard gear grease' *).
• Fit a new V-ring.
• Reinstall the key on the shaft and reassemble the propeller.
*) A suitable grease is VETUS 'Shipping Grease' , Part number: VSG.
For a part number of a replacement zinc anode (c/w mounting bolt)
and for a V-ring, see page 44, 44
'Service Parts' page in your bow thruster manual.
vetus® Maintenance and Warranty Manual for Thrusters
from other vessels or a defective ground in
the shore power system.
Zinc anode corrosion can also result from
a short circuit to any part of the thruster
mechanism.
The zinc anode should be inspected and/or
replaced at least once per year.
Replace the zinc anode if it is less than half
ø 110 mm, ø 125 mm, ø 140 mm, ø 150 mm and ø 185 mm
1 Nm
A
ø 110
A
44, 44
B
Bow thrusters with tube diameter
'Replacement parts' , or consult the
5
M4 M6
2.5
5 - 6 Nm
B
ø 125, ø 140, ø 150
Outboard Gear
Grease
Loctite® 242
ø 250 mm and 300 mm
4
A
5
ø 250, ø 300
ENGLISH
the original size.
In clear water it is also possible to check the
zinc anode during the sailing season.
W
arninG
Make sure that you disconnect power to
the thruster!
3 M5
2 Nm
A
B
3 M5
2 Nm
A
B
ø 185
24 M16 5
20 - 25 Nm 5 - 6 Nm
3
10 M6
2 Nm
PH2
M6
2 1
9
020901.02