Chapter 3 Fuel Injection Equipment
12. Fuel Injection Nozzle
i
4LHA Series
(3)
Nozzle
body identification number
The
type
of
nozzle can be determined
from
the
number
inscribed
on the outside
of
the
nozzle
body.
1) Hole type fuel injection nozzles
Sample
Y
DLL A — 150 P
244JO
-Design
code
-Spray
angle
-Nozzlesize
Psize
Ssize
-Mounting angle
of
nozzle
on
cylinder
head
Code
A:
at angle
No
code:
not at angle
Type
(DLL:
semi-long type)
YANMAR
Identification
number
12-2
Fuel
injection
nozzle
disassembly
NOTE:
1.
Disassemble fuel iniection nozzle
in a
clean area
as for fuel injection pump.
2.
When
disassembling more than one fuel injection
nozzle, keep
the
parts
for
each injection nozzle
separate
for
each cylinder
(i.e.
the
nozzle
for
cylinder
1
must be remounted in cylinder
1).
(1) When removing
the
injection nozzle
from
the
cylinder
head,
remove
the
high pressure fuel pipe, fuel leakage
pipe,
etc.,
the
injection nozzle retainer nut, and then
the
fuel injection nozzle.
Fuel
injection nozzle
Fuel
injection
nozzle
retainer
Heat
protector
(teflon)
(2) Put the
nozzle
in a vise
NOTE: Use the special nozzle holder for the hole type injec-
tion nozzle
so
that
the
high pressure mounting
threads are not damaged.
(3)
Remove
the
nozzle
nut
Box
spanner
Holder
NOTE: Use
a
special
box
spanner
for the
hole type
(the
thickness
of
the two nozzle nuts
is
15mm (0.5906in.))
(4)
Remove
the inner parts
NOTE: Be careful
not to
loosen
the
spring seat, adjusting
shims or other small parts.
12-3
Fuel
injection
nozzle
inspection
12-3.1
Washing
(1) Make sure
to
use new diesel
oil to
wash
the
fuel injec-
tion
nozzle
parts.
(2)
Wash
the nozzle in clean diesel oil
with
the
nozzle
clean-
ing
kit.
Nozzle
cleaning
kit
1)
Diesel
Kiki
nozzle
cleaning
kit:
Type
NP-8486B
No.
5789-001
2)
Anzen
Jidosha
Co.,
Ltd.
nozzle
cleaning
kit:
Type
NCK-001
(3)
Clean
off
the
carbon
on the
outside
of
the
nozzle body
with
a brass brush.
3-1-60
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