Mercury 90 Service Manual

6B-10 - LOWER UNIT 90-830234R3 DECEMBER 1997
Water Testing
Checking for Cavitation (Continued)
1. Rough Water Plate (b) – Using this type of plate
may be helpful in reducing cavitation when run-
ning in windy rough water conditions where air is
sucked-in the water intake when jumping waves.
Install a 1/32 in. metal plate that extends from the
hull bottom to the top of the water intake housing.
This plate tends to reduce air intake as well as re-
duce spray.
b
b - Rough Water Plate
Shift Cable Installation
WARNING
The shift cable must be adjusted to lock the re-
verse gate against unexpected engagement
(caused by water pressure hitting the gate) while
operating the boat in forward. Activation of the
reverse gate will cause sudden unexpected stop-
ping of the boat. Sudden stopping may cause oc-
cupants to be thrown within the boat or even out
of the boat. This action may result in serious inju-
ry or death.
1. Attach shift cable (a) to the shift cam (b) with flat
washer and locknut as shown. Tighten locknut
against the flat washer, then back-off the locknut
1/4 turn.
2. Place remote control handle into full forward
position.
3. Adjust the brass barrel (c) on the shift cable so
that roller (d) is at the full end of travel (bottom) in
the shift cam when the remote control is in full
forward.
4. Attach the brass barrel (c) to the bracket with bolt
and locknut. Tighten the bolt until it seats against
the barrel, then back-off the bolt 1/4 turn. Hold
bolt from turning, and tighten locknut on bolt. The
barrel must be free to pivot.
b
a
d
c
a - Shift Cable
b - Shift Cam
c - Barrel
d - Roller
5. Recheck the shift cable adjustment in forward
shift position. The correct shift adjustment will
position the cam far enough on the roller in order
to lock the the reverse gate into forward position.
You should not be able to forcibly push up the re-
verse gate toward neutral. Pull on the reverse
gate by hand to verify this.
IMPORTANT: The forward locking of the reverse
gate must be met. If not, readjust the shift cable.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English