Alpha Propeller Removal; Alpha Propeller Installation - Mercury 4.3 TKS series Operation & Maintenance Manual

Alpha Propeller Removal

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.
1. Place a wood block between the propeller blade and the anti‑ventilation plate to prevent rotation. Straighten bent tabs on
tab washer.
2. Turn the propeller shaft nut counterclockwise to remove the nut.
3. Slide the tab washer, drive sleeve, propeller, and thrust hub off the propeller shaft.

Alpha Propeller Installation

Operating the engine with a loose propeller can damage the propeller, the drive, or drive components. Always tighten the
propeller nut or nuts to specification and check for tightness periodically and at the required maintenance interval.
IMPORTANT: If reusing the tab washer, carefully inspect tabs for cracks or other damage. Replace the tab washer if condition
is questionable.
a
b
1. Apply a liberal coat of one of the following lubricants to the propeller shaft.
Tube Ref No.
2-4-C with PTFE
95
Extreme Grease
2. Slide the thrust hub onto the propeller shaft, with the stepped side toward the propeller hub.
3. Install the Flo‑Torq II drive hub into the propeller.
NOTE: The drive sleeve is tapered and will slide fully into the propeller as the nut is tightened and properly torqued.
4. Align the splines and place the propeller on the propeller shaft.
5. Install the drive sleeve and locking tab washer.
6. Install and tighten the propeller nut to the specified torque.
Description
Propeller nut (minimum)
7. Bend three tabs on the tab washer down into the grooves in the spline washer. After the first use, bend the three tabs
straight and retorque the propeller nut. Bend tabs back down into the spline washer. Check the propeller every 20 hours of
operation. Do not operate with a loose propeller.
90-8M0113857 DECEMBER 2015
eng
d
c
Description
WARNING
!
NOTICE
a - Propeller shaft
b - Thrust hub
c - Flo‑Torq II drive hub
d - Propeller
e - Drive sleeve
f - Locking tab washer
e
g - Propeller nut
f
6215
g
Where Used
Propeller shaft
Propeller shaft
Section 4 - Maintenance
Part No.
92-802859A 1
8M0071842
Nm lb‑in.
136 –
Page 47
lb‑ft
100