NON-BIGFOOT GEAR HOUSING
Page 6A-4990-857046R1 NOVEMBER 2001
Trim Tab Adjustment and Replacement
IMPORTANT: The trim tab is made of a special alloy to aid in protecting the drive shaft
housing and gear housing from galvanic corrosion (corrosion and pitting of metal
surfaces). Do not paint or place protective coating on the trim tab, or trim tab corro-
sion protection function will be lost.
TRIM TAB REPLACEMENT
Replace trim tab if damaged or 50% (or more) is corroded. Mark location of old trim tab on
anti-ventilation plate before removal; install new trim tab in same location.
TRIM TAB ADJUSTMENT
NOTE:
The trim tab provides a means to offset (balance) some of the steering load that is
caused by propeller torque at higher operating speeds.
NOTE: Loosen trim tab screw sufficiently to allow trim tab to disengage from locking ridges
in gear case before attempting to move tab. DO NOT strike trim tab with a hard object to
make adjustments.
1. Shift engine control into NEUTRAL and turn ignition key to OFF position.
2. If at higher speeds the boat turns more easily to the left, loosen screw, move the trim
tab (trailing edge) to the left (when viewed from behind). Tighten retaining screw to spe-
cified torque.
3. If the boat turns more easily to the right, loosen screw, move the trim tab (trailing edge)
to the right (when viewed from behind) turn trim tab (trailing edge) to the right . Tighten
retaining screw to specified torque.
52835
a
b
c
a-Trim Tab
b-Anti-Ventilation Plate
c-Trim Tab Screw and Washer
Trim Tab Screw Torque
16 lb-ft (21.0 Nm)
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