I N J E C T O R HIGH PRESSURE TEST. This
test checks for leaks at the filter cap
g a s k e t , body plugs and nut seal ring.
1 . Clamp the injector properly and purge
the air from the system.
2. Close the Thru-Flow valve, but do not
overtighten.
NOTE
M a k e sure lever 4 is in the down
p o s i t i o n before operating pump le-
ver 1.
3 . Operate pump lever 1 to build up to
Figure 11C-14. Injector in Position
1600 to 2000 psi (11,024-13,780 kPa) on
for Testing with J 23010
gauge 1. Check for leakage at the injec-
tor filter cap gaskets, body plugs and
3.
Position
the
injector
rack
in
the
i n j e c t o r nut seal ring.
f u l l - f u e l position.
I N J E C T O R PRESSURE HOLDING TEST.
4. Place pump lever 1 in the vertical po-
This
test
determines
if
the
sition.
b o d y - t o - b u s h i n g mating surfaces in the
injector are sealing properly and indi-
5. Move lever 3 to the forward detent
c a t e s proper plunger-to-bushing fit.
position.
1 . Clamp the injector properly and purge
6. The injector follower should be de-
the air from the system.
pressed rapidly (40 to 80 strokes per mi-
nute) to simulate operation in the
2. Close the Thru-Flow valve, but do not
engine.
Observe the spray pattern to
overtighten.
s e e that all spray orifices are open and
d i s p e r s i n g the test oil evenly. The be-
3 . Move lever 2 to the rear, horizontal
ginning and ending of injection should be
position.
s h a r p and the test oil should be finely
atomized with no drops of test oil forming
4 . Operate pump lever 1 until gauge 1
on the end of the tip.
reads approximately 700psi (4,823 kPa).
T h e highest pressure reference number
5. Move lever 4 to the up position.
s h o w n on gauge 2 will be reached just
b e f o r e injection ends. Use the following
6 . Time the pressure drop between 450
r e f e r e n c e values to determine the rela-
t o 250 psi (3,100 to 1,723 kPa). If the
t i v e acceptability of the injector. Refer-
pressure drop occurs in less than 15
ence values are from 127 minimum to 146
seconds, leakage is excessive.
maximum.
Refer to "Troubleshooting" on page
11C-50 if the fuel injector does not pass
NOTE
any of the preceding tests.
The reference value obtained when
pop testing the needle valve injec-
If the fuel injector passes all of the
tors is to be used as a trouble
a b o v e tests, proceed with the "Fuel Out-
shooting and diagnosis aid. This
put Test" on page 11C-13.
allows comparative testing of injec-
U N C L A M P I N G THE INJECTOR. Unclamp
tors without disassembly,
Exact
the injector as follows:
v a l v e opening pressure values can
o n l y be determined by the Needle
1 . Open the Thru-Flow valve to release
Valve Tip Test using tester J
pressure in the system.
23010
and
tip
test
adaptor
J
23010-129 or auxiliary tester J
22640.
Fuel System and Governor