Testing Of Fuel Injectors - Yanmar 3TNV82A-B Service Manual

FUEL SYSTEM

Testing of Fuel Injectors

CAUTION
Never use a steel wire brush to clean
fuel injectors. Damage to the nozzle and
other components is likely to result.
1. Thoroughly clean the fuel injector nozzle using
clean diesel fuel and a brass wire brush.
2. Visually inspect the fuel injectors and nozzle
protectors for deposits or damage. Clean, repair
or replace as necessary.
Note: For testing the fuel injector using an
injection nozzle tester. Operate the tester
following the information provided by the
tester manufacturer. Use clean, filtered
fuel or FIE calibration fluid for the test.
3. Using the correct adapter, connect a fuel
injector to a nozzle tester. Aim the fuel injector
into a suitable container to catch the fuel spray.
A
WARNING
• Never inject fuel toward you. Since the
fuel is injected at high pressure from
the nozzle, it may penetrate the skin,
resulting in injury.
• Never inject fuel toward a fire source.
Atomized fuel is highly flammable and
may cause a fire or burn skin.
7-38
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• ALWAYS wear eye protection when
servicing the engine and when using
compressed air or high-pressure
water. Dust, flying debris, compressed
air, pressurized water or steam may
injure your eyes.
• Failure to comply may result in minor
or moderate injury.
4. Pump the operating lever of the tester slowly,
observing the pressure reading at the point
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where the fuel injector begins spraying fuel
(Figure 7-52).
See Figure 7-55 for injector ID location.
See Test and Adjustment Specifications on
page 7-12 for correct pressure readings.
Note: The opening pressure of a new fuel
injector will be approximately 725 psi
(5 MPa; 51 kgf/cm
has been operated for five hours or
longer.
A
CAUTION
FLYING OBJECT HAZARD!
Figure 7-52
2
) higher than one that
TNV DI Service Manual
Fuel Injectors
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