4.9
S
ECTION
4 • B
ILGE
& U
NDERWATER
G
EAR
390 Sundancer
®
(
425 Sundancer
®
)
Jam Nut
Shaft
Thread
Prop
Torque
Torque
Diameter
Size
Nut
Ft. Lbs.
Ft. Lbs.
1"
3/4"
Bronze
100-125
100
1 1/4"
7/8"
Bronze
150-175
100
1 1/2"
1 1/8"
Bronze
250-275
100
1 3/4"
1 1/4"
Bronze
275-300
100
2"
1 1/2"
Bronze
325-350
100
2 1/2"
1 3/4"
Bronze
400-425
100
P
ROPELLER
I
NSTALLATION
(F
IG
. 4.9.1)
I
LLUSTRATION
#4
I
LLUSTRATION
#2
I
LLUSTRATION
#1
I
LLUSTRATION
#3
2 X 4 WEDGE
BLOCK
ALL CORNERS OF KEY SHOULD BE CHAMFERED
INCORRECT FIT
KEY RIDING UP IN KEYWAY
CORRECT FIT
KEY SHOULD SEAT IN
KEYWAY
IMPROPER CHAMFER
ON KEY WILL RESULT
IN KEY RIDING UP IN
KEYWAY
TOP RADIUS IN KEYWAY
SHOULD BE 1/2 THE
FILLET RADIUS WITH NO
SHARP EDGES
CHAMFER ON KEY
SHOULD BE LARGER
THAN FILLET IN
KEYWAY
If the jam nut and prop nut are installed properly,
the propeller should not loosen. If you tighten both
nuts holding only the propeller blade, the nuts could
possibly thread back on the shaft to the cotter pin.
It is important that the above procedure be followed.
NOTICE
A
C
B
PROP NUT
KEY
SHAFT
KEYWAY
COTTER PIN
PROP
JAM NUT
D
A
C
B
D
E
G
F
E
G
F
When removing or replacing propellers, be sure to
install the correct propeller on the correct drive.
P
ROPELLER
I
NSTALLATION
For proper rotation, the installation of propellers on
inboard engine boats requires the right hand
propeller to be installed on the starboard side and
the left hand propeller to be installed on the port
side. Install in the following manner:
1.
Inspect the key. It must be chamfered so that
the corners of the key do not touch the
keyway fillets.
2.
Install the propeller on the shaft without the
key in the keyway. Slide the propeller all the
way on the shaft until it seats. Mark the shaft
on the leading edge of the hub with a felt tip
marker and remove the propeller.
3.
Install the key in the keyway and slide the
propeller on the shaft. If the key is not
pinned, tap the key back slightly as the
propeller slides up the taper. This will
ensure that the propeller does not ride the
key up the keyway end radius, thus forcing
the propeller off-center. The propeller is
properly seated if the hub is in the same
position as previously marked.
4.
Install a board (2 x 4) against the hub
perpendicular to the keel and rotate the propeller
clockwise until one blade rotates against the
board. Do not put a board between the strut
and the rudder.
5.
Install the large bronze prop nut on the propeller
shaft and seat the propeller with the correct
torque as listed on the table below.
6.
Install the jam nut and torque to 100 ft. lbs.
7.
Install the cotter pin.
Summary of Contents for 390 Sundancer
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