Yamaha F150B, Service Manual

Page: 215 / 458

7-2
Power unit (check and adjustment)
0
1
2
3
4
5
6
7
8
9
10
A
Checking the oil pressure
1. Connect a computer to the outboard
motor and use the YDIS. To connect and
operate the YDIS, see the YDIS (Ver.
1.30 or later) Instruction manual. To dis-
play “Oil pressure.”
2. Start the engine and warm up until the
engine idle speed is stable at 650–750 r/
min, and then turn it off.
3. Measure the oil pressure. If it is out of
specification, see “Troubleshooting the
power unit (trouble code not detected)”
(4-11) and perform the troubleshooting
again.
Checking the valve clearance
Measure the valve clearances when the
engine is cold.
Do not turn the flywheel magnet counter-
clockwise, otherwise the water pump
impeller may be damaged.
1. Reduce the fuel pressure. See “Reducing
the fuel pressure” (6-4).
TIP:
When measuring the valve clearances, the
fuel line must be disconnected, so make sure
to reduce the fuel pressure before performing
the disconnection procedure.
2. Remove the flywheel magnet cover and
spark plug wire cover.
3. Disconnect the fuel hoses
a
and vapor
gas hoses
b
, and then remove the
canister
c
and fuel pumps
d
.
4. Disconnect the spark plug wires
e
, and
then remove the blowby hoses
f
, all
spark plugs, and cylinder head cover
g
.
5. Turn the flywheel magnet clockwise and
align the “TDC” mark
a
on the flywheel
magnet with the pointer
b
, and check
that the “I” marks
c
and
d
on the driven
sprockets are aligned.
Oil pressure (reference data):
450.0 kPa (4.50 kgf/cm 2 , 65.3 psi)
at 60 °C (140 °F) with SL 10W-30
engine oil and at 700 r/min
a
a
b
b
c
d
f
g
e