Mercury 100 FourStroke, Service Manual

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90-830234R3 DECEMBER 1997 MID-SECTION - 5B-5
Make sure that water level is above gear housing
water intake holes whenever engine is running.
While operating “up” circuit, the ram will continue to
tilt outboard to full up position for trailering.
Tilting Outboard Up and Down
Manually
WARNING
Before opening the manual release valve, make
sure all persons are clear of engine as engine will
drop to full “down” position when valve is
opened.
With power trim installed, the outboard can be raised
or lowered manually by opening the manual release
valve 3 turns maximum (counterclockwise).
51432
a
a - Manual Release Valve
Trim “In” Angle Adjustment
WARNING
Operating some boats with engine trimmed to
the full “in” trim angle (not using trim adjustment
bolt at planing speed) will cause undesirable
and/or unsafe steering conditions. Each boat
must be water tested for handling characteristics
after engine installation and after any trim adjust-
ments.
IMPORTANT: Some boat/motor combinations,
that do not use the trim adjustment bolt and are
trimmed to the full “in” trim angle, will not experi-
ence any undesirable and/or unsafe steering
conditions during planing speed. Thus, not us-
ing trim adjustment bolt may be desired. Howev-
er, some boats with engine trimmed to the full
“in” trim angle at planing speed will cause unde-
sirable and/or unsafe steering conditions. If
these steering conditions are experienced, un-
der no circumstances should the engine be oper-
ated without the trim adjustment bolt and without
the bolt adjusted in the proper holes to prevent
unsafe handling characteristics.
Water test the boat not using the trim adjustment bolt.
If undesirable and/or unsafe steering conditions are
experienced (boat runs with nose down), install trim
adjustment bolt in proper hole to prevent unsafe han-
dling characteristics.