FUEL
INJEC
TI
ON
AN
D G
OVERN
OR SYSTEMS 147
@
~Nut
~Retain
e
r
plate
f!Ir-
Pu
elln
ject
cr
o--
0 -rIOg
o Gasket
Heal shield
~
,}-
-
-
C
o p pe
r
gasket
~':I-
--
Precombustion chamber
0--
Copper gasket
combustion byproducts even tually affect injector opera-
tion. Clogging may affect the spray pattern, which may
cause misfiring and decreased engine performance.
Yanmar docs nor specify when a fuel injector should be
removed for cleaning. A period ic maintenance schedule
can
beformulated based on when engine performance de-
clines due to the
injector bec
oming
clogged. An in
jec
tor
should pc
rfonn
properly for several hundred hours before
requiring service; otherwise, operating proced ures.
fuel
type
or
cond ition. or another cngineproblem are responsi-
ble for unsatisfactory injec tor
ope
ration .
Injector service should
be limited to removal for exter-
nal cleaning.
Have a Yanmar dealership or diesel fuel in-
jection shop
pcr
f
onn
internal cleaning or overhaul.
Rem oval and I
nsta
llation
R
ef
er to F
igure
23 for an exploded view
of
the fuel in-
jecto
r and precombustion
cha
mber assembly.
I. Thoroughly clean the fuel injector and the area around
the injector to make sure debris
will not fall into the en-
gmc.
NOTE
Plug or cap all fuel openings 10 prevent the
enlrance
of
din
or debris.
NOTE
Note the location
of
all washers so they can
he returned to their original positions.
2. Detach the fuel return line from the nipple on the fuel
injector. On mulricylindcr engines, the fuel return line
must be removed from all injectors. Hold the injector and
remove
the fuel return line nut (A,
Figure
24) and return
line fitting.
3. If necessary, unscrew the fuel line retaining
brackets.
Detach the high-pressure fuel line
(8,
Figure
24) from the
fuel injector.
4.
Unscrew the retainer plate nuts (A,
Figure
25), then
remove the retainer plate (
8).
5. Remo ve the fuel injector (Figure 26).
6, Extract the heat shield and gas ket (f igure 27). The
gasket resides in a groove in the top
of
the heat shield.
NOTE
Do not damage the precombustion chamber
when removing it in Step 7ifit is tight in the
cylinder head.
If
necessary. remove the cyl-
inder head to dislodge the precombustion
chamber.
7
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