Mercury 40 FourStroke Maintenance And Installation Manual page 44

FEATURES AND CONTROLS
If adjustment is necessary, loosen trim tab bolt and make small adjustments at
a time. If the boat turns more easily to the left, move the trailing edge of trim tab
to the left. If the boat turns more easily to the right, move the trailing edge of
trim tab to the right. Retighten bolt and retest.
MODELS WITH POWER TRIM
Operate your boat at normal cruising speed, trimmed to desired position. Turn
your boat left and right and note the direction the boat turns more easily.
If adjustment is necessary, loosen trim tab bolt and make small adjustments at
a time. If the boat turns more easily to the left, move the trailing edge of trim tab
to the left. If the boat turns more easily to the right, move the trailing edge of
trim tab to the right. Retighten bolt and retest.
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