Yamaha F150B Service Manual page 429

Checking the gear oil level
1. Fully tilt the outboard motor down.
2. Remove the gear oil check screw a, and
then check the gear oil level in the lower
case.
TIP:
If the oil is at the correct level, a small amount
of oil should overflow out of the check hole
when the gear oil check screw is removed.
3. Install a new gasket and the gear oil
check screw a, and then tighten the
gear oil check screw a to the specified
torque.
Gear oil check screw a:
9 N·m (0.9 kgf·m, 6.6 ft·lb)
a
Checking the gear shift and throttle
operation
1. Check that the gear shift operates
smoothly when the remote control lever
is shifted from N to F or R.
2. Check that the throttle operates smoothly
when the remote control lever is shifted
from F or R to the fully open position a.
N
F
a
Checking the outboard motor
mounting height
1. Check that the anti-cavitation plate is
aligned with the bottom of the boat. If the
mounting height is too high, cavitation
will occur and propulsion will be reduced.
Also, the engine speed will increase
abnormally and cause the engine to
overheat. If the mounting height is too
low, water resistance will increase and
reduce engine efficiency.
TIP:
The optimum mounting height is affected by
the combination of the boat and the outboard
motor. To determine the optimum mounting
height, test run the outboard motor at differ-
ent heights.
2. Check that the clamp brackets are
secured with the clamp bolts.
Predelivery check
R
a
10-6
0
1
2
3
4
5
6
7
8
9
10
A