LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1988 >> Cutaway 7.3 M >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Injectors Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Injectors Test

WARNING: When testing injector nozzles, keep spray contained to avoid serious injury. DO NOT  allow injector to release line pressure on hands, arms or any part of body, as pressure is high enough to penetrate skin.
  1. Always use CLEAN calibration fluid in Injector Test Stand (Rotunda 014-00300). Install injector on tester. Open test stand valve slightly and operate handle 8-10 times to bleed air from injector. Close valve.
  2. Open tester valve. Slowly lower tester handle and note pressure shown on gauge as injector opens. Repeat several times to obtain accurate reading.
  3. Opening pressure for a NEW injector should be 1800-1950 psi (126-137 kg/cm2 ). If injector opening pressure is below 1425 psi (100 kg/cm2 ) on a used injector, replace injector.
  4. Using test stand, maintain pressure at about 200 psi (14 kg/cm2 )) below opening pressure. No fuel leakage should occur. Slight wetting of tip after 5 seconds is okay. DO NOT  wipe tip with fingers. If leakage occurs, injector(s) must be replaced.
scientia non olet · About LEMON Manuals