CYLINDER GP 1164915 - Caterpillar

Testing the Injection Nozzles
Remove the injection line and the injection nozzle.
Illustration 1 g02481897
Nozzle tester
Connect the injection nozzle to the high-pressure line of the nozzle tester.
Slowly increase the pressure until the nozzle ejects fuel. Use the pressure gauge to determine the pressure.
If the injection pressure is lower than 120 - 130 bar (1740 - 1885 psi), then replace the spacer in the nozzle with a thicker spacer. If the injection pressure is higher than 120 - 130 bar (1740 - 1885 psi), then replace the spacers in the nozzle with a thinner spacer.Spacer thickness of 0.1 mm (0.004 inch) corresponds to a modification of 7 - 10 bar (102 -145 psi).
Check the injection nozzle for drips after fuel has been injected.
Create a pressure of approximately 20 bar (290. psi) below the recommended injection pressure range. Check for fuel escaping the nozzle.Checking the Nozzle Jet
Remove the injection lines and the injection nozzles.
Connect the injection nozzle to the high-pressure line of the nozzle tester.
Quickly increase pressure until the nozzle ejects fuels 3 or 4 times.
Illustration 2 g02481998
Correct shape of nozzle jet spray.
Illustration 3 g02482438
Incorrect shapes of nozzle jet spray.
Hold a white sheet of paper approximately 30 cm (12 inch) away form the nozzle. Eject fuel and observe the shape of the spray.