Yanmar 4LHA-DTP, Operation Manual

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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