Systems and scheduled
maintenance
Solé, S.A. C-243 b, km 2 · 08760 Martorell (Barcelona) ·Tel. +34 93 775 14 00 · www.solediesel.com · [email protected]
28
Marine diesel engines. Operator’s manual
Maintenance task. Injector inspection
To check the injection pressure of injectors
(opening pressure) you have to follow these steps:
1.
Remove nozzle and washer.
2.
Install the injection nozzle on the tester. Slowly
operate the tester handle full strokes to bleed
(remove) air from the pipe and nozzle.
3.
Make a slow increase in pressure by operating the
tester handle at a speed of more than one stroke
per second while observing the pressure gauge.
4.
The pressure gauge reading will slowly increase
and, when the nozzle starts discharging fuel, it will
go down fast. Take the gauge reading right then as
the injection pressure.
5.
To adjust the injection pressure, increase or decrease
the amount of shims fitted to the nozzle holder.
6.
Look at the orifice discharge pattern (shape of discharge) when fluid begins to flow through
the injection nozzle. The discharge must be finely and uniformly atomized. Any change is an
indication of a bad nozzle.
7.
If the nozzle is bad, remove the tip from the nozzle and wash
needle valve and body in clean washing solution.
And if the nozzle is still bad after the tip has been washed,
replace the tip.
When installing the new tip, remove synthetic resin film
from the tip and slide the needle valve in the body in clean
diesel fuel to wash off inhibitor completely.
8.
The washer shown on point 1 must be replaced.
When testing the injection nozzle, keep its tip pointed away from the operator. Fuel from the
orifices in the tip of the nozzle is under high pressure and can cause injury to the operator.
Maintenance task. Bleeding air from the fuel system
Prime the fuel system to bleed the air from the circuit. Trapped air in the fuel system can
cause difficult starting and erratic engine operation. It is necessary to prime the system:
✓
Before starting the engine for the first time.
✓
After running out of fuel and adding fuel to the tank.
✓
After fuel system maintenance such as changing the fuel filter, draining the fuel/water
separator, or replacing a fuel system component.
Model
Injection pressure
MINI-62 14,22 a 15 MPa (145 a 153kgf/cm
2
)
SM-103
18,4 a 19,12 MPa (185 a 195 kgf/cm
2
)
