LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1987 >> Forward Control 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 6.2L Diesel >> Testing >> Injectors >> 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 shutoff valve an additional 1/2 to 1-1/2 turns. Blow dry nozzle tip. Slowly depress tester lever until pressure gauge reads 1400 psi (98 kg/cm2 ). Maintain pressure for 10 seconds and observe nozzle tip.
  2. Replace injector if drop of test fluid drops from tip. A drop may form but not drop off within specified time period. See Fig 1. Release tester pressure.
Fig 1: Nozzle Leakage Test A drop of test fluid may form but not drop off within 10 seconds. Courtesy of General Motors Corp.
G9778
scientia non olet · About LEMON Manuals