4. Regular inspection
57
Air bleeding in the fuel circuit
When the engine stops due to replacement of fuel filter,
fuel injection pump or insufficient fuel, you should perform
air bleeding.
1. Loosen the air bleeding plug (B) on the fuel filter.
2. Operate the priming pump by hand to bleed air inside
the fuel circuit.
3. Operate the priming pump until the air is discharge
d
c
ompletely through visual checking.
DV2213164B
Injector maintenance
• The injectors are designed to spray the fuel delivered
b
y the injection pump directly into the spherical
combustion chamber in the piston crown.
• The injector consists of the nozzle and the nozzl
e
ho
lder.
• A copper gasket fitted to the injector ensures gas-tight
seating and good heat dissipation.
• The opening pressure of the nozzle is adjusted
by
m
eans of shims at the compression spring.
DV2213022A
Fuel injection nozzle
1. Install a nozzle to the nozzle tester.
DV2213023A
2. Check the fuel injection pressure. If the pressure does
not
satisfy the reference value, adjust the injecti
on
pr
essure of the nozzle using an adjustment shim.
Fuel is highly inflammable. Fire may occur when you
use fire near the engine when air bleeding in the fuel
circuit from the priming pump.
If you separate the parts where the seal ring (copper
seal ring, rubber coating seal ring, etc.) is assem-
bled, you should replace the seal ring with a new
one. otherwise, leakage may occur in the fuel filter
connections, preventing normal functioning.
A
B
1. Rod type filter 7. Connect hole for fuel
delivery
2. Cap nut 8.
No
zzle holder
3.
C
ompression spring
9. Connect tube for overflow
4. Compression pin 10. Shim
5. Cap nut for fixed nozzle 11. Pin
6.
N
ozzle 12.
N
ozzle bush
8
7
9
5
4
3
11
12
6
10
2
1
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