Yanmar 4LHA-HTP Operation Manual page 467

Chapter 3 Fuel Injection Equipment
7. Fuel Injection Nozzle
NO TE: Use a special socket wrench for the hole type
(the thickness
mm (0.5906 in.)).
(4) Remove the inner parts
NOTE: Be careful not to loosen the spring seat, ad-
justing shims or other small parts.
7-4 Fuel injection nozzle inspection
74.1 Washing
(1) Make sure to use new diesel oil to wash the fuel
injection nozzle parts.
(2) Wash the nozzle in clean diesel oil with the nozzle
cleaning kit.
1) Diesel K i k i nozzle cleaning kit:
Type NP-8486B N o . 5789-001
2) Anzen Jidosha Co., Ltd. nozzle cleaning k i t :
Type NCK-001
(3) Clean off the carbon on the outside of the nozzle
body with a brass brush.
(4) Clean the nozzle seat with cleaning spray.
of the two nozzle nuts is 15
Nozzle cleaning kit
(5) Clean off the carbon on the tip of nozzle with a
piece of wood.
(6) Clean hole type nozzles with a nozzle cleaning
needle.
Nozzle cleaning needle (piano wire)
02mm dia. wire. 22mm long x 5 wires
z
c i
Part code no.
74.2 Nozzle inspection
(1) 1 nspect for scratches/wear
Inspect the oil seals for abnormal scratches or wear
and replace the nozzle if the nozzle sliding surface
or seat are scratched or abnormally worn.
(2) Check nozzle sliding
Wash the nozzle and nozzle b o d y in clean diesel
oil, and make sure that when the nozzle is pulled
out about half way from the b o d y , it slides down
by itself when released.
Rotate the nozzle a little; replace the nozzle/nozzle
body as a set if there are some places where it does not
slide smoothly.
Hole type
3-2-45
4LHA Serie
28210-000010