Cub Cadet Yanmar 3TNV72 - Manual (Page 186)

FUEL SYSTEM
TNV IDI Service Manual 7-25
Fuel Injectors
4. Pump the operating lever of the tester slowly,
observing the pressure reading at the point
where the fuel injector begins spraying fuel.
See Test and Adjustment Specifications on
page 7-7 for correct pressure readings.
Note: Opening pressure of a new fuel injector
will be approximately 72.5 psi (0.5 MPa;
5 kgf/cm
2 ) higher than one that has been
operated for five hours or longer.
5. Pump the operating lever slowly to hold the
pressure steady at a point just below the
opening pressure and hold that pressure for five
seconds. Observe the injector to see that it is
sealing properly and is not “dripping.” If fuel
leaks from the return line fitting, check that the
nozzle case nut is tight. Service or replace the
injector if fuel continues to leak from either the
return line fitting or nozzle.
6. Pump the operating lever more rapidly to
repeatedly “pop” the injector and observe the
spray pattern. The pattern should be a very fine
uniform spray. If dripping or an uneven pattern
is seen, service or replace the injector. See
Fuel Injector Test Results on page 7-26.
A
WARNING
HIGH-PRESSURE HAZARD!
• Avoid skin contact with the
high-pressure diesel fuel spray caused
by a fuel system leak such as a broken
fuel injection line. High-pressure fuel
can penetrate your skin and result in
serious injury. If you are exposed to
high-pressure fuel spray, obtain
prompt medical treatment.
• NEVER check for a fuel leak with your
hands. ALWAYS use a piece of wood
or cardboard. Have your authorized
Yanmar industrial engine dealer or
distributor repair the damage.
• Failure to comply could result in death
or serious injury.
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A
WARNING
To prevent possible eye injury, always
wear SAFETY GLASSES while servicing
the engine.
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