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www.poseidon-bv.nl
Ordernumber
Date
25-01-2015
Ref.erence
STA-STF
Version
2
Status
Final
Page
11
of
20
2.3.2 Replacement Instructions for the seals by SPLIT seals with a
propeller shaft in position.
When complete new seal assemblies have been supplied, endless radial lip seals
are mounted. When the seals need to be replaced while the vessel is in the
water and or the
shaftline is NOT removed, you can use
split
seals.
Split seals have a split at 1 place and are seals, of which the rubber seal rings
can be replaced without the need to remove the propeller shaft. For replacement
of the forw seal set, the following instructions are to be followed up.
1.
Lock the shaft using the dedicated shaft locking device, if installed. This will
prevent the gearbox clutch to be activated.
2.
Close the seal isolation valves of the water lubrication system.
3.
Clean the shaft area right behind the seal thoroughly.
4.
If the vessel is in the water!! than pump up the stand-by-seal with an air or oil
pressure of approx 0,5 bar. (max 1 bar)
5.
Unscrew screw (item 22) of the locking ring
6.
Remove all screw (item 21)
7.
Pull the locking ring (item 3) forw. Remove the O-ring (item 11)
8.
Provide the shaft with some grease. This makes the liner slide easier over the shaft.
9.
Than you can pull the wearing liner (item 2) forward.
10.
Remove screws (item 23),
11.
Remove the retaining plate (item 4).
12.
Pull the first radial lip seal out by using a small hook.
13.
Cut or saw the radial lip seals and its spring (item 12) of the shaft.
14.
Take the first Seal Support ring (item 5) out of the housing. There are 2 threaded
holes in the face of the ring that you can use to put a M6 screw in that will help pulling
it out.
15.
Remove the 2
nd
radial lip seal (item 12) as you did the first one and also cut this one
away.
16.
Check the clearance between shaft and seal housing at bottom side and at top side to
check if the bearings are worn out or not.
17.
Check if the seal seat is still in good condition and clean all faces thoroughly. Remove
any grease and dirt.
18.
If all is OK, parts are clean and the bearing clearance is still within tolerance then we
can start mounting the new split radial lip seals and assemble the whole Pegasus seal
again.
19.
Take the spring from each seal (see details) and unscrew the joint. Bring the spring
around the shaft until the connection of both ends of the spring is visible and, holding
one end in each hand, twist the other end a few turns counter clockwise.
20.
Take both spring ends , wind them counter clockwise , bring the ends together and
release the spring ends to ob
tain a proper engagement. To avoid any ‘ curl
-
in’
tendency at the split, the precautions, detailed in figurers 1
–
3 shall always be
followed.
21.
Move the seal around the shaft and lift the spring into the groove in the seal lip.
22.
Ensure that the two spring ends match perfectly, with the split at the top side.
23.
Push the seal evenly into the chamber and also press firmly against the back side of
the housing.
24.
During the installation of forward split radial lip seal, grease (according to parts list)
shall be added.
25.
Double check that all springs are in correct position in the seat of the split radial lip
seal
