Trim Plate Adjustment - Mercury Optimax 250 Service Manual

Trim Plate Adjustment

The Jet Drive unit trim plate is factory set for general applications. Should a particular boat
experience porpoising problems, the trim plate can be adjusted as follows:
1. Loosen both jam nuts on trim plate (one starboard and one port).
a -
b -
c -
d -
e -
2. Turn both screws the exact same number of turns. Tighten both jam nuts against trim
plate. The distance from top of nut to bottom of boss should be equal on both sides.
Adjusting the trim plate may affect boat handling (steering). Overly sensitive steer-
ing or reduced turning ability could result from trim plate adjustments. Boat han-
dling characteristics also vary with the load distribution in the boat. Use caution af-
ter adjusting: check for acceptable handling characteristics under all loading
conditions. Failure to adequately test the boat could result in inadequate steering
control resulting in property damage, personal injury or death.
90-888438 JUNE 2002
a
Jam Nut with Washer (Two: One On Each Side)
Jam Nut
Small Diameter Washer
Large Diameter Washer
Plate
f - Screw
b
c
d
e
f
WARNING
INSTALLATION
Page 1D-33