Yamaha F30B 2018, Service Manual

Page: 314 / 348

10-9
Predelivery check
Checking the outboard motor mount-
ing height
1. Check:
• Outboard motor mounting height
Improper

Adjust.
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a. Check that the anti-cavitation plate “1” is
aligned with the bottom of the boat “2”.
TIP:
• If the mounting height is too high, cavitation
will occur and propulsion will decrease. Be-
sides, the engine speed will increase abnor-
mally and cause the engine to overheat.
• If the mounting height is too low, water resis-
tance will increase, which will decrease en-
gine efficiency and performance.
• The appropriate mounting height depends on
the combination of the boat and outboard mo-
tor. To determine the appropriate mounting
height, test run the outboard motor at differ-
ent heights.
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2. Check:
• Mount bolts
Loosen

Tighten.
Checking the power trim and tilt unit
1. Check:
• Power trim and tilt unit
Abnormal noise

Check the PTT unit.
Interference

Check the hose and wire
harness routing, or mounting of the out-
board motor.
Does not display

Adjust the trim sensor
cam. See “Adjusting the trim sensor cam”
(9-31).
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a. Check that there is no abnormal noise pro-
duced when the outboard motor is tilted up
or down.
b. Check that there is no interference with ca-
bles, hoses, leads, or the boat when the
tilted-up outboard motor is steered.
c. Check that the trim meter, on the boat’s
gauge, displays full down when the out-
board motor is in the full-down position.
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Checking the hydro tilt unit
1. Check:
• Hydro tilt unit operation
Not operate

Replace.
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a. Check that the outboard motor tilts up and
down smoothly when the tilt lock lever “1”
is in the release position “a”.
1
2
1
a