LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1985 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 6.2L Diesel >> Testing >> Injection Nozzle >> Leakage Test
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Leakage Test

  1. Open tester shut off valve to pressure gauge an additional 1/2 to 1 1/2 turns. Blow dry nozzle tip. Connect a short piece of clear plastic tubing to each fuel return fitting on nozzle.
  2. Slowly depress tester lever until pressure gauge reads 1400 psi (98 kg/cm2 ). Maintain pressure for 10 seconds and observe nozzle tip.
    3. NOTE: A drop of test fluid may form but not drop off within 10 seconds.
  3. Replace nozzle assembly if drop of test fluid drops from tip within 10 seconds. A drop may form but not drop off within the specified time period. See Fig 1. Release tester pressure.
Fig 1: Nozzle Leakage Test
G9778
scientia non olet · About LEMON Manuals