Yanmar 3TNV Series Service Manual page 59

2. Inspection and Adjustment
(b) Spray pattern inspection
After adjustment to the specified valve opening
pressure, use a nozzle tester and check the spray
pattern and seat oil-tightness.
Seat oil tightness check
After injecting a few times, increase the pressure
gradually. Hold the pressure for about 5 seconds
at a little before the valve opening pressure of
1.96 MPa(20kgf/cm
does not drip from the tip end of the nozzle.
If extreme oil leak from the overflow joint exists
during injection by the nozzle tester, check after
retightening. If much oil is leaking, replace the
nozzle assembly.
[Informative: Fuel injection valve structure]
2
), and check to see that oil
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