Checking The Engine Oil Level; Checking The Engine Shut-Off Switch; Checking The Fuel Joint And Fuel Hoses (Fuel Joint To Carburetor); Checking The Fuel Strainer - Yamaha F4B Service Manual

MNT
Recommended engine oil:
4-stroke motor oil with combinations of
the following SAE and API oil classifica-
tions:
API: SE, SF, SG, SH, SJ, SL
SAE: 5W-30, 10W-30, 10W-40
Replacement engine oil quantity:
0.6 L (0.63 US qt, 0.53 lmp qt)
6. Leave the outboard motor off for 5–10
minutes.
7. Remove the dipstick a and wipe it clean
using a rag.
8. Fully screw the dipstick a all the way in,
and then remove it.
9. Check the oil level using the dipstick to
make sure that the level falls between the
upper level a and lower level b.
a
a
b
10. Screw in the dipstick.
11. Start the engine, and then check that the
oil can be seen through the oil check hole
and that there is no oil leakage. NOTICE:
If the oil cannot be seen through the
oil check hole or if there is oil leakage,
stop the engine and find the cause.

Checking the engine oil level

1. Check the engine oil level. See "Check-
ing the engine oil level" (10-3).

Checking the engine shut-off switch

1. Check the engine shut-off switch. See
"Checking the engine shut-off switch"
(10-4).
10-9
Maintenance
Checking the fuel joint and fuel
hoses (fuel joint to carburetor)
1. Check the fuel joint and fuel hose con-
nections. See "Fuel hose" (6-1).

Checking the fuel strainer

1. Check the fuel strainer. See "Checking
the fuel strainer" (6-6).

Changing the gear oil

Do not reuse a gasket, always replace it
with a new one.
1. Place the outboard motor in an upright
position.
2. Place a drain pan a under the gear oil
drain hole.
3. Remove the drain screw b and gasket
c.
4. Remove the check screw d and the
gasket e and let the oil drain completely.
NOTICE: Check the used oil after it
has been drained. If the oil is milky,
water is getting into the lower case
which can cause gear damage.
a
5. Insert the gear oil tube into the drain
hole, and then slowly fill the lower case
with gear oil until oil flows out of the
check hole and no air bubbles are visible.
e
d
c
b