3-55. FUEL INJECTOR TESTING; TEST NO. 3
THIS TASK COVERS:
a. Setting Up Test Stand
d. Adjusting and Measuring Fuel Delivery
b. Setting Up Injector on Test Stand
e. Top-stop Injector Adjustment
c. Testing Check Ball Seating
Test stand link (15434) ST 790-331
Master injector (15434) ST-1262
Fuel injector test No. 2 performed (para. 3-54).
Injector test stand (15434) ST-790
SPECIAL ENVIRONMENTAL CONDITIONS
Work area clean and away from blowing dirt and
Fluid, automatic transmission, type A
(Appendix C, Item 11)
Oil, lubricating, OE/HDO 30
GENERAL SAFETY INSTRUCTIONS
(Appendix C, Item 21)
Fuel and electrical systems repairman
a. Setting Up Test
Check fluid levels on injector test stand. The cam box is filled to the top level of sight glass
with OE/HDO 30 lubricating oil. Refill when oil level drops to bottom level of sight glass. Fill
hydraulic fluid reservoir to bulb level with type A automatic transmission fluid. Be careful
not to allow oil to enter standpipe in center of reservoir. The test oil level in stand must be
kept at least 3/4 full of test fuel.
Timing wheel (11)
Rotate so wheel mark and
pointer are aligned.
Hydraulic valve (20)
Do not operate test stand with load cell in position or damage may result.
Load cell tester (17)
Position on test stand (27) and
secure by opening air valve (21).
Air pressure regulator (22)
a. Adjust by turning knurled
Load cell tester (17) must be
knob (24) until load cell tester (17)
between 370 and 390 when
registers within coded range
adjusted within marked band on
b. Lock in place with locknut (23).