TM 5-3805-260-24
TESTING 9N3979 PENCIL-TYPE FUEL INJECTION
NOZZLES
Tools Needed:
*5P4150 Nozzle Testing Group.
5P4244 Adapter.
8S2270 Fuel Collector.
FT1384 Extension.
8S2245 Cleaning Tool Group.
8S2258 Brass Wire Brush.
8S2250 Nozzle Holding Tool.
8S2252 Carbon Seal Installation Tool.
1F1153 Needle Nose Pliers.
8H8505 Combination Wrench.
8H8502 Combination Wrench.
8S2274 Socket.
8S1589 Socket.
9S5031 Socket.
5P4813 Socket.
5/64" Hex Wrench.
5P4150 NOZZLE TESTING GROUP
A. 5P4721 Tube. B. 5P4146 Gauge, 0 to 1000
psi (O to 6900 kPa) used to test PC capsule
valves. C. 2P2324 Gauge, 0 to 5000 psi (O to
34 500 kPa) used to test DI capsule valves
and pencil-type nozzles. D. Gauge protector
valve for 5P4146 Gauge (B). E. Gauge
protector valve for 2P2324 Gauge (C). F. On-
off valve. G. Pump isolator valve. H.
5P4720 Fitting. J. 5P8744 Adapter for
capsule nozzles. K. 5P4244 Adapter for
pencil-type nozzles.
EXTRA VALVE
L. Gauge protector valve (must be In open position
at all times).
CAUTION
Be sure to use clean SAE J967 Calibration oil
when tests are made. Dirty test oil will damage
components of fuel injection nozzles. The
temperature of the test oil must be 65 to 750 F
(18 to 240 C) for good test results.
Order calibration oil by part number, in the
quantities needed, according to the information that
follows:
Kent-Moore Corp.
1501 South Jackson St.
Jackson, MI 49203
Order:
J-26400-5 [5 U.S. gal. (18.9 liter)]
J-26400-15 [15 U.S. gal. (56.7 liter)]
J-26400-30 [30 U.S. gal. (113.5 liter)]
J-26400-55 [55 U.S. gal. (208.2 liter)]
Viscosity Oil Company
3200 South Western Ave.
Chicago, IL 60608
Order:
Viscor Calibration Fluid
1487C-SAE J-967C
Available in 30 U.S. gal (113.5 liter) or 55 U.S.
gal. (208.2 liter) drums.
To test a pencil-type fuel injection nozzle, all six
steps of the test procedure must be completed, and the
step sequence must be as follows:
I.
Return Leakage Test. (This test is not
needed with the 9N3979 Nozzle).
II.
Valve Opening Pressure Test.
III.
Flush the Nozzle.
IV.
Tip Leakage Test.
V.
Orifice Restriction Test.
VI.
Cap Leakage Test.
NOTE: Do all tests before the nozzle is disassembled for
cleaning, or before any adjustments are made to a
nozzle. A test can show that the nozzle must not be
used again.
Nozzle Preparation for Test
Before fuel injection nozzle (I) can be tested, all
loose carbon around the tip of the nozzle must be
removed with the 8S2258 Brass Wire Brush (M).
2-39