Yanmar 6CXM-GTE, Service Manual

Page: 108 / 132

- 3-43-20 -
a) Clean off the carbon on the outside of the of the
nozzle body with a brass brush.
b) Clean the nozzle seat with cleaning spray.
c) Clean off the carbon on the tip of the nozzle with a
piece of wood.
d) Clean the nozzle hole with a nozzle cleaning nee-
dle.
(6) Inspection of fuel injection nozzle
1) Inspect the nozzle for abnormal scratches or wear and
replace it if the sliding surface or seat is scratched or
abnormally worn.
2) Make sure that the nozzle slides down by itself when
the nozzle is pulled out about half way from the body
and released.
Rotate the nozzle a little, and try again.
Replace the nozzle as a set if there are some places
where it does not slide smoothly.
(7) Reassembly of fuel injection nozzle
1) Install the fuel injection nozzle (B).
2) Install the fuel injection pipe joint to the fuel injection
nozzle (B), (together with the rubber packing (E).
3) Tighten the nozzle tightening nut (C).
4) Tighten the fuel injection pipe cap nut (D).
Pipe joint tightening torque
24.5 N
࡮
m (2.5 kgf
࡮
m)
Tightening torque
31.4 N
࡮
m (3.2 kgf
࡮
m)
Tightening torque
34.3 N
࡮
m (3.5 kgf
࡮
m)
Caution:
* If the nozzle tightening nut (C) is tightened first, fuel oil
may leak into the lube oil.
* If the cap nut (D) is tightened first to the final torque, gas
may leak from the packing at the nozzle end.