3
030311.01
Conversion set propeller shaft seal
ENGLISH
Foreword
This Vetus propeller shaft seal conversion set, with
inner bearing, has a double shaft seal.
To ensure a complete seal:
• the propeller shaft must have a maximum
diameter-tolerance of + 0.0mm / - 0.16 mm
•
the shaft must be centred within the casing.
Align the propeller shaft with the ship engine
before putting the seal in place!
The propeller shaft speed may not exceed the
values shown in the table below.
D (in mm)
25
30
RPM
2700
2500
Installation
N.B. The numbers refer to the numbers in the
drawings.
General
Lubrication
The shaft and if applicable, the rubber
outer bear-
ing
, gets cooled and lubricated by external water.
It is therefore necessary that sufficient external
water is supplied whenever the shaft is in oper-
ation.
The minimum amount of water required is:
- Propeller shaft diameter 25 mm: 20 litres/hour
- Propeller shaft diameter 30 mm: 30 litres/hour
1
The required external water can be supplied
with a tap from the engine’s external water
cooling system.
2
If an air vent is present (where the water
injection point is either under or less than
15cm above the waterline) then
tap the
engine’s external water cooling system
between the external water pump and the
air vent
and not between the air vent and the
water injection point.
3
External water may also be supplied by a
separate water scoop with a seal:
- Propeller shaft diameter 25/30 mm: min. G
3/8
Place the water scoop with its intake grooves
sufficiently in front so that enough water
flows in and it does not interfere with the
propeller water.
The shaft seal may be installed either under or
above the waterline. If it is placed
above the
waterline
it must, in order to ensure adequate
supply of water, be connected as shown in draw-
ing 1.
4
In addition to lubrication by external water,
the seal must also be lubricated with grease
between the seal lips.
Outer bearing
5
Remove the ship’s propeller.
Loosen the bolts and remove the end piece of
the outer bearing.
Fit the new end piece of the outer bearing.
Use the old bolts.
Put the ship’s propeller back in place.
Inner bearing
6
Take the flexible coupling off the propeller
shaft.
Loosen the hose clips and remove the rubber
sleeve with the inner bearing.
Note
! Loosen the packing gland and remove
the greased cord packing if it is difficult to
slide the inner bearing over the shaft.
The shaft must be free of scratches, burrs, and
must be clean, especially where the shaft touches
the floating bearing and seal. The end of the shaft
or the key way or holes which may be present
must also be free of burrs.
7
Fit the rubber sleeve with the 4 hose clips
over the prop shaft casing.
- Propeller shaft diameter 25/30 mm: The inner
side of the opening has to touch the end of
the casing.
8
Grease the shaft where it will be enclosed
by the floating bearing and the shaft seal.
Grease the rims of the shaft seal.
Only use the grease supplied. Any other lubri-
cants could damage the shaft seal, the sleeve,
or the rubber bearing.
9
Fit the inner bearing on the propeller shaft
and slide it into the sleeve.Tighten the hose
clamps (4 to 5 Nm torque).
10
Stick a piece of adhesive strip ‘
A
’ over the
keyway. This will prevent the shaft seal being
damaged when fitted on the shaft.
Damage to the seal edges will lead to leaks!
Grease the seal lips. Fit the shaft seal on
the propeller shaft. Ensure that the O-ring is
properly in place and secure the shaft seal
with 3 screws (10 Nm torque).
11
A
Remove the screw with the washer and
fill about 50% of the forward space with
grease (approx. 1 cm
3
).
Use only
the
grease supplied! Replace the screw and
the washer, tighten it to about 5 Nm.
B
Attach the hose connection tube to the
bearing casing using a liquid sealant.
N.B. Do not use Teflon tape!
Put the flexible coupling back on the shaft.
Water intake
12
Connect the hose connection tube
(water intake) using a piece of hose, inner
dia-meter 10 mm (ø 25, ø 30), to the
water supply. Each connection must be
attached by 2 stainless steel hose clips.
After launching
Check the following for leakage immediately: the
shaft seal, the rubber sleeve connections, and all
the hose connections.
It may be necessary to bleed the assembly first.
Disconnect the hose from the inner bearing until
water flows out.
Always open the cap (after the water scoop)
before casting off.
Check the shaft seal for leaks and its temperature
while cruising. An excessively high temperature
indicates insufficient water for lubrication and
cooling!
Maintenance
The following maintenance must be performed
after every 200 hours of operation or once a year
while the ship is on dry dock:
-
Loosen the bolts which attach the shaft seal
to the inner bearing.
- Clean the surface of the deal rims where it
touches the shaft so that it is free of grease,
dirt and residue.
-
Check whether the rim of the seal is not visi-
bly damaged, and replace the shaft seal if it is.
Article code for replacement:
- ‘ZWB25RES’ for ø 25 mm propeller shaft
- ‘ZWB30RES’ for ø 30 mm propeller shaft
-
Lubricate the shaft and the exposed seal rim .
-
Reattach the shaft seal onto the inner bear-
ing, tightening the bolts to about 10 Nm.
- Fill the seal with clean grease, refer to
Installation, point 11 B.
-
Check the shaft seal and all connections for
leakage immediately after launching.
