SYSTEMS AND SCHEDULED MAINTENANCE
30
Operator’s Manual Marine Diesel Engines
Revision 0. 05/2016
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.
8.
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
9.
The washer shown on figure 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.
For this operation you have to follow these steps:
1.
Loosen all the injection pipes.
2.
Start the engine to drive out air in the injection pipes and nozzles automatically.
3.
When fuel overflows from an injection pipe, tighten it up and wait until fuel overflows from
another one. Repeat it until all injection pipes are tightened.
4.
After bleeding, clean up fuel spillage.
When fuel overflows from the injection pipes, wipe thoroughly with a cloth. Spilled fuel is a
fire hazard.
