Yanmar 1GM User Manual page 53

OPERATION, LUBRICATION, MAINTENANCE AND TUNE-UP
47
Ai! bleed plug
O-ring
111---
Filter element
Canister
~
Retaining ,'ng
fuel and maintain the fuel filter and fuel system compo-
nents to prevent a fuel system malfunction.
WARNING
Serious fire hazards always exist around
diesel fuel. Do not allow any smoking in ar-
eas where fuel is present. Always have afire
extinguisher, rated for fuel and electrical
fires, on hand when refueling or servicing
any part ofthe fuel system.
Fuel lines
Periodically inspect all fuel lines for leakage and dam-
age. Replace or tighten them as required. Do not
overtighten a fitting to try to stop a leak; overtightening
may damage the fitting threads or the fuel line sealing sur-
faces.
Air that enters the fuel system due to a damaged fuel
line or loose connection may cause the engine to missfire.
Bleed the fuel system as described in this chapter.
Fuelfilter
Using clean fuel and maintaining the fuel system are
extremely important when operating a diesel engine. Die-
sel fuel, in addition to its obvious function as fuel, pro-
vides lubrication for various components of the injection
system. Due to close operating tolerances, dirty fuel can
cause major damage to the fuel injection pump and injec-
tors. The engine is equipped with a fuel filter (Figure 6,
typical) to remove dirt from the fuel before it enters the
fuel injection pump.
After every 50 hours of operation, or more frequently if
necessary, remove and disassemble the fuel filter and
clean the inside of the fuel bowl and filter element. The
filter body contains a replaceable element. Replace the el-
ement after every 250 hours of operation or more fre-
quently if dirt clogs the element after fewer hours of
operation. It is a good practice to replace the fuel filter ev-
ery season or ifthe engine has not been operated for an ex-
tended period.
NOTE
The boat may be equipped with additional
fuel filters. Be sure to clean and maintain
those filters according to the manufacturer S
instructions.
NOTE
If
the fuel filtering system is inadequate to
properly protect the engine, consult with a
marine dealership that has experience with
diesel engines for fuel filter recommenda-
tions.
Refer to Figure 7 when using the following procedure
to clean the filter or replace the filter element:
I. Position a receptacle under the filter to catch spilled
fuel.
2. Unscrew the retaining ring and remove the canister
and filter element. Note that the O-ring may remain on the
filter body or on the canister.
3. Remove the element from the canister. If dirty or dam-
aged, discard the element.
4. Clean the canister in clean diesel fuel.
5. Install the filter element in the canister.
6. Install a new O-ring on the canister.
7. Install the canister on the filter body, then install the re-
tainer ring and tighten it hand-tight.