S
ECTION
4 • B
ILGE
& U
NDERWATER
G
EAR
4.6
250 Select EX
3. U
NDERWATER
G
EAR
A. P
ROPELLER
G
ENERAL
I
NFORMATION
Propellers should be free of nicks, excessive
pitting and any distortions that alter them from their
original design. Badly damaged propellers should
be replaced, but those that are chipped, bent or
merely knocked out of shape can be reconditioned
by your marine dealer.
When doing extensive cruising, it is advisable to
carry an extra propeller aboard.
B
ASIC
P
ROPELLER
C
HARACTERISTICS
Propellers have two basic characteristics:
• Diameter
• Pitch.
Diameter is that distance measured across the
pro pel ler hub line from the outer edge of the 360°
that is made by the propeller’s blade during a
single rotation. Pitch is that distance in inches that
a pro pel ler will travel if rotated one revolution without
any slippage.
For example, a propeller with a 12-inch pitch, when
ro tat ed 360° would, theoretically, advance 12 inch es
through the water. Actually, no propeller applied to
any boat is 100% effi cient. No 12-inch pitch blade
will, in a single ro ta tion, advance a boat 12 inches.
This variance is re ferred to as slippage.
PITCH
DI AM E TER
P
ROPELLER
P
ITCH
AND
D
IAMETER
(F
IG
. 4.6.2)
D
UAL
P
ROPELLER
D
RIVE
U
NITS
:
1. Shut off engine, remove key, shift into neutral
and put tape over ignition switch key slot.
IMPORTANT: Correct rotation propeller MUST
match direction or rotation of propeller shaft.
2. Remove Propeller shaft anode and rear prop nut.
Pull the propeller straight off the shaft. Remove
the rear thrust washer that is behind the rear
propeller. If the propeller is seized to the shaft
and cannot be removed by hand, special tools
are needed. Have the propeller removed by an
authorized dealer or trained mechanic.
3. Remove the front prop nut, propeller and thrust
washer in the same manner.
4. Coat the propeller shaft with an anti-seize
lubricant.
5. Slide front thrust hub onto propeller shaft, with
tapered side toward propeller hub.
6. Align splines and place front propeller on
propeller shaft.
7. Install front prop nut and torque. (Refer to drive
owners manual for specifi c torque value.)
8. Install rear thrust hub, propeller and nut in same
manner.
9. Install propeller shaft anode.
P
ROPELLER
P
ARTS
(F
IG
. 4.6.1)
REAR
PROPELLER
NUT
SHAFT
ANODE
PROPELLER
SHAFT
REAR
THRUST HUB
REAR
PROPELLER
FRONT
PROPELLER
NUT
FRONT
PROPELLER
FRONT
THRUST HUB
Содержание 250 Select EX
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