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Home >> Toyota >> 1984 >> Corolla LE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Injection Nozzles >> Opening Pressure

Opening Pressure

  1. Blow out any dirt around injection nozzles, then remove fuel lines and nozzles. Mark nozzles for correct installation.
  2. Install nozzle on pressure tester. Bleed air from union nut. Pump as hard as possible, several times, to clean out nozzle. Pump up pressure slowly and note when nozzle opens.
  3. Opening pressure should be 1920-2205 psi (135-155 kg/cm2 ) for used nozzles; 2062-2205 psi (145-155 kg/cm2 ) for new nozzles. There should be no dripping after injection.
  4. If pressure is not within these specifications, disassemble and clean nozzle. Change shims as necessary to obtain proper opening pressures.
    NOTE: Shims are available in 43 sizes in increments of .001" (.025 mm) from .035-.077" (0.9-1.95 mm). Changing nozzle shim by one size will change injection pressure by 50 psi (3.5 kg/cm2 ). Never use more than one shim.
  5. Test nozzle again to ensure opening pressure is correct, then check for leakage.
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