NOZZLE POSITION FOR RETURN LEAKAGE TEST
1. Fuel injection nozzle. Q. 5P4244 Adapter.
R. FT1384 Extension. S. 8S2270 Fuel
Close on-off valve (F). Open pump
isolator valve (G).
Open gauge protector valve (E) and
operate the tester slowly until the
pressure is at 1400 to 1600 psi (9630
to I 1 045 kPa).
Look at the leakage from the return at
the top (pressure screw end) of the
fuel injection nozzle.
RETURN LEAKAGE SPECIFICATION
After the first
Valve Opening Pressure Test (VOP)
Loosen nut (5) and turn nozzle tip
down so that it extends into FT1384
Extension (R) as shown.
Tighten nut (5) to 5P4244 Adapter (Q).
Nut (5) can be tightened by hand if 1
1023 O-ring Seal (6) is not damaged.
NOZZLE CONNECTED TO 5P4150 NOZZLE TESTER
When fuel injection nozzles are tested, be sure to wear
eye protection. Fuel comes from the orifices in the
nozzle tip with high pressure. The fuel can pierce (go
thru) the skin and cause serious injury to the operator.
Keep the tip of the nozzle pointed away from the operator
and into the 8S2270 Fuel Collector and FT1384
NOZZLE READY FOR TEST
E. Gauge protector valve. F. On-off valve.
G. Pump isolator valve.
Put a shop towel around the top of the nozzle
(pressure screw end) to take in any fuel
Close on-off valve (F). Open pump isolator
Open gauge protector valve (E). Operate
the pump to make a slow increase in
pressure until the valve in the fuel injection
nozzle just starts to open. Read the
maximum gauge pressure at the instant
fluid flows from the tip.
NOTE: It is possible for the pressure reading of the
gauge to go down fast if the valve makes a noise
(chatters) when it opens. It is also possible for the
pressure reading of the gauge to be almost constant
when the valve in the fuel injection nozzle opens.
NOTE: The salve in the fuel injection nozzle can be good
and still not make a noise (chatter). or not have a very
fine vapor (spray) from the orifices in the tip of the fuel
injection nozzle during Step 4.
If the opening pressure is less than 1500 psi
10300 kPa), do not use the fuel injection nozzle again.