ENGINE - Continued
Injectors - Continued
Follow the test equipment manufacturers recommended test procedures and perform the
Injector Throughput Test
Injector High Pressure Test
Injector Pressure Holding Test
Fuel Output Test
To check the fuel output, mount the injector in tester J22410 or similar model tester. Ensure the inlet
and outlet fuel lines are connected properly. If not the dirt on the inlet filter may be backwashed through
the injector. Be sure to install the injector exactly as the tool instructions detail.
Needle Valve Tip Test
Using auxiliary tester J22640 and test J23010 or similar type equipment, perform needle valve tip test
following the tool manufacturers instructions
Needle Valve Lift Test
Place tool J9462-02 plunger on a flat
surface and zero the gage.
Place the needle valve in the spray tip.
Insert the quill of the needle valve in
the hole of the plunger of tool J9462-
(4) Hold the spray tip land tight against the
gage. The dial should read 0.008 -
0.018 in. (0.20 -0.46 mm).
If it is greater than 0.018 in. (0.45 mm) replace the needle valve and tip. If it is less than 0.008 in. (0.20
mm) inspect spray tip seat or needle valve for foreign material. If the lift is satisfactory, test g. failed
because of a weak spring. Repeat test g. with a new spring or new spray tip assembly depending
Injector must be removed from truck. Before any repair can be carried out the injector must be
Disassembly Prior To Repair
Clamp injector in injector holding fixture J22396.
Remove filter caps (3), gaskets (2), and filter (1). Discard the filter (inlet side only) and gaskets.