Mercury 4.3 TKS series User Manual

Section 4 - Maintenance
90-8M0113857 eng DECEMBER 2015 Page 47
Alpha Propeller Removal
!
WARNING
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
NOTICE
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 - Propeller shaft
b - Thrust hub
c - Flo‑Torq II drive hub
d - Propeller
e - Drive sleeve
f - Locking tab washer
g - Propeller nut
1. Apply a liberal coat of one of the following lubricants to the propeller shaft.
Tube Ref No.
Description Where Used Part No.
95
2-4-C with PTFE Propeller shaft 92-802859A 1
Extreme Grease Propeller shaft 8M0071842
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
Nm lb‑in. lb‑ft
Propeller nut (minimum) 136 – 100
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.
a
b
c
d
e
g
6215
f

Mercury 4.3 TKS series Specifications

General

Brand	Mercury
Model	4.3 TKS series
Category	Engine
Language	English