Mercury 100 FourStroke, Service Manual

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90-830234R3 DECEMBER 1997 LOWER UNIT - 6A-17
4. Remove shift cam from housing.
5. Replace shift cam if worn.
a
51117
a - Shift Cam
NOTE: If shift shaft splines are rough, shift shaft seal
lips will be cut during removal/installation.
6. Remove shift shaft bushing and clip from shift
shaft.
7. Replace shift shaft if splines are worn or shaft is
twisted.
8. Remove (and discard) O-ring.
d
d
c
e
b
a
53928
a - Bushing
b - Clip
c - Shift Shaft
d - Splines
e - O-ring
9. Remove (and discard) seal.
a
53929
a - Seal
Forward Gear Bearing Race
IMPORTANT: Retain shim(s) for reassembly. If
shims are damaged, replace with new shims of
equal thickness.
1. Remove race and shim(s) using Slide Hammer
(91-34569A1).
a
b
c
27653
a - Race
b - Shim(s)
c - Slide Hammer (91-34569A1)
Trim Tab Adjustment and
Replacement
IMPORTANT: The trim tab is now painted and
does NOT aid in protecting the drive shaft hous-
ing and gear housing from galvanic corrosion
(corrosion and pitting of metal surfaces). Side
anodes now provide protection. Do not paint or
place protective coating on the side anodes, or
corrosion protection function will be lost.
1. Replace trim tab if damaged. Mark location of old
trim tab on anti-ventilation plate before removal;
install new trim tab in same location.
2. The trim tab provides a means to offset (balance)
some of the steering load that is caused by pro-
peller torque at higher operating speeds. If at
higher speeds the boat turns more easily to the
left, loosen bolt, move the trim tab (trailing edge)
to the left (when viewed from behind); retighten
bolt. Turn trim tab (trailing edge) to the right if the
boat turns more easily to the right.
b
c
a
53931
a - Trim Tab
b - Anti-Ventilation Plate
c - Retaining Bolt and Washer; Torque Bolt to 22 lbs. ft.
(29.8 N m)