Yanmar YM276 Service Manual page 489

Fuel System
230-1
0 5
FUEL FILTER
-
GENERAL INFORMATION
A fuel filter is used t o prevent dirty fuel from reaching the injec-
tion pump and injection nozzles.
The filter element will require occasional replacement t o maintain
an adequate flow of fuel t o the injection pump. The frequency
of this service will vary according t o the cleanliness of available
fuel and the care used
in
storage.
HOW THE FUEL FILTER WORKS
Fuel from the-tank enters the filter housing inlet (A) (Fig. above)
and fills the sediment bowl
('2).
The fuel i s then filtered a s it
passes through the filter element (61, leaves housing
a t
outlet
(Dl,
and flows t o the injection pump.
Two alr vent screws ( E l (Fig. under) are used t o bleed air from the
fuel system up to the injection pump (a third air vent screw i s
located on the pump inlet fitting for the purpose of removing
air from inside the pump).
The left-hand vent screw on filter
permits removal of air in sediment bowl before the filter element;
the righthand screw after the filter element.
Water and sediment settle to the bottom of the sediment bowl for
removal when necessary.
A
-
Inlet
B
-
Filter Element
-
C
-
Sadimant Bowl
D -Outlet
E -Spring
REPLACING FILTER ELEMENT
Before replacing the filter element, shut-off the fuel supply t o
the filter by turning the fuel shut-off lever straight up. Then,
do the following.
1. Unscrew large nut
(Dl
(Fig. under) which retains the sediment
bowl from filter housing.
2.
Remove nut and sediment bowl ( C ) from filter housing.
3.
Remove filter element (BI. and install
a
new element in its
place.
4. Thoroughly clean sediment bowl. Be sure that O-ring seal (A)
is in good condition and install onto sediment bowl. Also, be
sure that spring
(El
(Fig. above) i s in place.
5.
Install sediment bowl. being careful not t o Overtighten nut
6. Turn on fuel supply.
7.
Open both air vent screws
(El
on filter and bleed screw on
injection pump t o bleed air form fuel. Tighten screws when
fuel flows free of bubbles.
A
A -O-ring Seal
B
-
Filter Element
C
-
Sdiment Bowl
D -Retaining Nut
E - B l e d Screws
SME18Wlll-8210 YM276and 2760
Kjnornoro. Primred in Japan