vetus ZWBH25 Propeller Shaft Seal Instruction Manual
- October 30, 2023
- vetus
Table of Contents
Installation manual
Propeller Shaft Seal
ZWBH25 ZWBH35
ZWBH30 ZWBH40
Copyright © 2023 VETUS B.V. Schiedam Holland
Principal dimensions
d
| D | H| L
---|---|---|---
ø 25| ø 43| 112|
144
ø 30
| ø 49,5| 112| 144
ø 35| ø 56| 112|
145
ø 40
| ø 61| 112|
145
Fokkerstraat 571 – 3125 BD Schiedam – The Netherlands
Tel.: +31 (0)88 4884700 – sales@vetus.com –
www.vetus.com
030313.02 2023-05 Printed in the Netherlands
Foreword
This VETUS propeller shaft seal with inner bearing has a double shaft casing.
To ensure a complete seal:
- the propeller shaft must have a maximum diameter-tolerance of + 0.0 mm / – 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 | 35 | 40 |
|---|
RPM
| 2700| 2500| 2300|
2100
Installation
N.B. The numbers refer to the numbers in the drawings.
General
1 The end of the shaft casing where the rubber sleeve is placed must be
free of burrs, grease, and must be clean. The free length of the tube must be
the same as, or longer than, dimension A shown in the Table.
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. The free
length of the shaft must be the same as, or longer than, dimension B shown in
the Table.
Ensure that the shaft has been placed in the casing.
Lubrication
The shaft and if applicable, the rubber outer bearing , gets cooled and
lubricated by external water. It is therefore necessary that sufficient
external water is supplied whenever the shaft is in operation.
The minimum amount of water required is:
– Propeller shaft diameter 25 mm: 20 litres/hour
– Propeller shaft diameter 30 mm: 30 litres/hour
– Propeller shaft diameter 35 mm: 35 litres/hour
– Propeller shaft diameter 40 mm: 40 litres/hour
2 The required external water can be supplied with a tap from the engine’s external water cooling system.
3 If an air vent is present (where the water injection point is either under or less than 15 cm 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.
4 External water may also be supplied by a separate water scoop with a
seal:
– Propeller shaft diameter 25/30/35/40 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 drawing 2.
5 In addition to lubrication by external water, the seal must also be lubricated with grease between the seal lips.
Final Assembly
6 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!
7 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 lubricants could damage the shaft
seal, the sleeve, or the rubber bearing.
8 Fit the rubber sleeve with the 2 hose clips over the shaft and over the
prop shaft casing.
– The inner side of the opening has to touch the end of the casing.
Tighten the hose clamps (4 to 5 Nm torque).
9 Remove the allen bolt and fill about 50% of the forward space with grease (approx. 1 cm³). Use only the grease supplied! Place the allen bolt back.
10 Connect the hose connection tube (water intake) using a piece of hose, inner diameter 10mm, 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 and if the free space is sufficient:
- Untighten the hose clamps.
- Move the shaft seal to the coupling.
- Clean the surface of the deal rims where it touches the shaft so that it is free of grease, dirt and residue.
- Lubricate the shaft and the exposed seal rim .
- Reattach the shaft seal onto the prop shaft casing. Tighten the hose clamps (4 to 5 Nm torque).
- Check the shaft seal and all connections for leakage immediately after launching.
‘ZWBH25, ZWBH30, ZWBH35′, ZWBH40’
030313.02