Yamaha F150B Service Manual page 438

MNT
Checking the PCV
1. Check the PCV. See "Checking the PCV"
(7-34).
Checking the PTT fluid level
1. Check the PTT fluid level. See "Checking
the hydraulic pressure" (9-34).
Checking the PTT operation
1. Tilt the outboard motor to the fully up and
fully down positions a few times and
check the entire trim range for smooth
operation. Check the PTT fluid level if the
tilt operation is not smooth.
TIP:
Make sure to listen to the winding sound of
the PTT motor for smooth operation.
2. Tilt the outboard motor to the fully up
position, and then support it with the tilt
a
stop lever
mechanism of the lever.
a
Checking the propeller
1. Check the propeller blades and splines.
Replace the propeller if cracked, dam-
aged, or worn.
10-15
Maintenance
to check the lock
Checking the spark plug
1. Disconnect the spark plug wire, and then
remove the spark plug.
2. Clean the electrode a with a spark plug
cleaner or wire brush.
3. Check the spark plug. Replace if the
electrodes are eroded, there is excessive
carbon or other deposits, or the gasket is
damaged.
4. Check the spark plug gap a. Adjust the
spark plug gap if out of specification.
Specified spark plug:
LFR5A-11 (NGK)
Spark plug gap a:
1.0–1.1 mm (0.039–0.043 in)
a
a