TUBE AS 8J8436 - Caterpillar

Open gauge protector valve (7), and close on/off valve (10) .
Then, open pump isolator valve (11) .
After you create a pressure of 1380 to 2000 kPa (200 to 290 psi) less than the opening pressure that was measured in the VOP Test, hold this pressure for 15 seconds. Count the number of drops that fall into the fuel collector.
Record the number of drops that fall. Compare the number of drops that are counted with Table 3.
Table 3
Tip Leakage Specification    
No more than 5 drops should fall in 15 seconds.    
If the nozzle is not within the specifications, DO NOT USE the nozzle.Orifice Restriction Test
Illustration 8 g00314156
Fuel Injector Nozzle that is Ready for Testing (7) Gauge protector valve (10) On/Off valve (11) Pump isolator valve
Close gauge protector valve (7) and on/off valve (10) .
Then, open pump isolator valve (11) .
Point the tip of the fuel injector nozzle into the extension and toward the fuel collector.Position the hole for the air purge screw toward the tester. This hole should be in line with 6V-2170 Tube (3). After this positioning, the fuel injector nozzle should be 15 degrees from vertical, and the spray pattern will be horizontal.
Create a rapid pressure increase, and look at the orifice discharge when fluid begins to flow through the fuel injector nozzle.In fact, look at the shape of this discharge. There should be a similar discharge through all nine orifices or six orifices. Any vertical change or any horizontal change indicates a faulty nozzle. Review Illustrations 9 through 12.
Illustration 9 g00319183
A Good Nozzle That Can Be Used Again
Illustration 10 g00319184
Discharge of an Orifice with a RestrictionReplace this fuel injection nozzle.
Illustration 11 g00319185
Discharge of an Orifice with a Horizontal DistortionReplace this fuel injector nozzle.
Illustration 12 g00319186
Discharge of an Orifice with a Vertical DistortionReplace this fuel injection nozzle.Leakage Test for Air Purge Screw
Illustration 13 g00314154
Fuel Injector Nozzle (19) Air purge screw and seal
Do not tighten the air purge screw more than the listed torque amounts. The air purge screw or the seal can be damaged.
Install air purge screw and seal (19) into the fuel injection nozzle.Note: Refer to Specifications, "Fuel Injection Nozzles and Adapters" for information on torques.
Point the tip of the fuel injector nozzle into the extension and toward the fuel collector.
Close on/off valve (10) .
Open gauge protector valve (7) and pump isolator valve (11) .
Pump the tester until the fuel injection nozzle fills with test fluid and the pressure gauge shows 12800 to 14800 kPa (1850 to 2150 psi).Note: To attain a pressure of 12800 to 14800 kPa (1850 to 2150 psi), you might need to pump the tester for 15 strokes or for 20 strokes.
Table 4
Specification for Air Purge Screw    
No leakage can occur between the air purge screw and the fuel injector nozzle's body.    
If leakage occurs, follow this procedure:
Replace the seal (15) .
Inspect the seal face of the air purge screw for damage. Replace the air purge screw, if necessary.
Retest the fuel injection nozzle. If leakage still occurs, the complete fuel injection nozzle needs