540
8
PROPULSION SYSTEMS
Studio ti 03312 540-04usa
139
8.6 PROPELLER SHAFT, STUFFING BOX CASE AND
SHAFT SUPPORT
The propeller shaft is fastened to the gearbox by means of a flange
coupling (1) and is aligned on the three points represented by the
gearbox (2), a water-lubricated propeller shaft seal (3) and a shaft
support (4). The propeller shaft seal includes a fixed piece fastened to the
hull and a movable piece, which is adjustable. This latter is pushed
against the fixed piece, so as to compress the seal inside of the case. It
is very important that the seal is compressed evenly, because if it doesn’t,
irregular pressure may occur on the seat housing and this could impair
the life and performance of the seal. The outer shaft support includes a
neoprene bushing (5), which uses the seawater as a lubricant. Check it
every season, as it might get worn quickly during navigation, especially
in sandy waters. The bushing wear causes a vibration increase. When
the yacht is on a sandbank, a good technician can easily evaluate, by
moving the shaft, if the wear demands the replacement of the bushing.
1. Flange coupling
2. Gearbox
3. Shaft seal
4. Shaft support
5. Neoprene bushing
S
CAUTION
Remember to check the shaft seal clamps after a period of inactivity of
the yacht before turning the shafts again, otherwise you might damage
them.
Propeller shaft seal
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