Section 5 - Maintenance
90-8M0074347 eng OCTOBER 2012 Page 87
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.
34
Special Lubricant 101 Propeller shaft 802859A1
94
Anti-Corrosion Grease Propeller shaft Obtain Locally
95
2-4-C with PTFE Propeller shaft 92-802859A 1
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 torque the propeller nut.
Description
Nm lb‑in. lb‑ft
Propeller nut (minimum) 75 – 55
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.
Flushing the Power Package
Your boat comes equipped with through the sterndrive water pickups. See Sterndrive Water Pickups (following) for the
flushing procedure. Consult your authorized Mercury MerCruiser dealer for further explanation.
IMPORTANT: Alpha engines with the sterndrive water inlet blocked off at the gimbal housing, and using a through the hull
water inlet, need a supply of cooling water available to both the sterndrive and to the engine during operation
a
b
c
d
e
g
6215
f
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