Yanmar 1GM User Manual page 54

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8. Loosen the air bleed plug (F igu r e 8) on top of the fuel
filter body .
9. Make sure the fuel tan k valve is open, then operate the
primer leve r on the fuel transfer pump (F ig ure 9).
10. Operate the lever while observing the fuel emitted
around the bleed p lug. Air will be emitted along with the
fuel. Stop operating the lever when the fuel is free of air,
then tighten the air bleed plug.
Bleeding air from the fuel system
Whenever air enters the fuel injection system, such as
when the fue l ta nk ru ns dry, components arc replaced, or a
fuel line is damaged or disconnected, bleed the air from
the fuel system to prevent engine misfire. Refer to Chap-
ter Seven for the ai r bleeding procedure.
Air Filter
An air filter (A, Figure 10, typical) removes airborne
di rt and debris. With in the air filter canister is a reuseable
polyurethane filter clement . Clean the filter element after
every
250
hours of operation or m ore frequently if the en-
gine ope rates in a dirty environment. Inspect the filter ele-
ment before each operating season to be sure it is clean
and undamaged.
Use the follow ing procedure to remove and clean the
fi lter clement:
I . Unsnap the filte r canister retaining clip (B , Fi gure 10)
and remove the canister and filter element.
2. Se parate the filter clement from the canister (Figure
11). Note the mesh cone inside the foam filter.
3. Inspect the foam for holes, tears or other damage. Dis-
card the foam if damaged.
CHAPTER THREE
4. Clean the foam filter and mesh cone in soapy water. If
the foam fi lter cannot be cleaned, disc ard it and install a
new filter. Let the foam filter dry.
5. Reassemble and reinstall the filter by reversing the re-
moval procedure.
NOTE
Be sure the intake tube (C, Figure 10) ofthe
canister points slightly downward and not
upward; otherwise. water can enter the tube
and run into thejilter.
Dr ive Belts
Inspect all drive belts at regular intervals to make sure
they arc in good condition and are properly tensioned. Re-
place worn, fra yed , cracked or glazed belts. The compo-
nents to which they direct power arc essential to the safe
and reliable operation of the boat. If correct adjustment is
maintained on each belt, all will usually give the same ser-
vice life. For this reason and because of the cost involved
in replacing an inner belt (requiring the removal of the