Mercury 50 - Propeller Selection; Propeller Removal; Propeller Installation

PROPELLER SELECTION
bclrct a propeller that wfll allow engine to
vp~~ate at or near top of reconimended full
throttle RPM range wtth a
normal load
Maxinium engine speed (RPM) for pro -
peller selectton extsts when boat speed ts
rllnxltiiuni and trlni IS nilnlmuni fol that
sptt cl (H~gh RPM caused by excessive
ing correct propeller.) Normally, there IS a
300 to 500 RPM change between propeller
pitches. Full throttle RPM range is listed
tn
SPECIFICATIONS.
If the engfne RPM during full throttle oper
-
ation is below the recommended range
shown in SPECIFICATIONS, propeller
MUST
BE changed to prevent loss of per-
PROPELLER REMOVAL
PROPELLER
(Continued)
AWARNING
Beforeattempting to remove or install pro -
peller, remove spark plug leads from spark
plugs to prevent engine from starting
accidentalty.
1 Remove top cowl (see COWL RE -
MOVAL and INSTALLATION) and d~scon-
nect spark plug leads.
2 Place wood block between propeller
blade and
anti-ventilat~on plate to prevent
rotation.
3 Turn propeller shaft nut counterclock
wise to
rerriove nut.
4 Slide tab washer, propeller and splined
thrust hub off propeller shaft.
PROPELLER REPAIR
Some damaged propellers can be repalred
Consult yo Ir Authortzed Dealer
PROPELLER INSTALLATION
IMPORTANT: Periodically check propeller
nut for tightness during boating season.
5 Apply a I beral coat of one of thefollow-
mg Quickst ver lubrtcants to the propeller
shaft; Special Lubricant 101, Antl-Corro-
sion Grease or 2 - 4 - C Mar~ne Lubricant.
6 Sl~de sylined thrust hub onto propeller
shaft wtth
tqrust hc b shoulder " toward
gear
housln J
Sltde pro$rller and tab washer In that
order,
onto ,haft anc fnstall propeller nut
Place a
wcod block between propeller
blade and
antt-vetntilation plate to prevent
rotatton.
Turn propt
11-71 shaft nut clockwise Ustng d
socket wrench TIGHTEN NUT SF-
CURELY [rr~ ntniunl of 55 Ib ft (74 6 N m)
of torque]
Bend tab otl tab washer to secure pro -
peller nut
Reconnect ssark pluq leads and
install top
cowl
IMPORTANT: After first use, bend tab
straight, retighten propeller nut
[mininwrn
of 55 Ib. ft. (14.6 N.m)] and again bend tab
on tab washer to secure nut.
ACAUTION
Operation with a loose propeller could
cause damage to the thrust hub and gear
housing during acceleration, deceleration
or when shrfiiing gears.