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Home >> Toyota >> 1983 >> Pickup Base >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Injection Nozzles >> Opening Pressure
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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 out, then 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 as follows: On models prior to VIN numbers JT4LN44D5D1111497 and JT4LN44S3D1111500, pressure should be 1778-1902 psi (125-135 kg/cm2 ). On models after the above VIN numbers, opening pressure should be 2272 psi (160 kg/cm2 ).
  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 20 thicknesses in increments of .002" (.05 mm). One size change will adjust pressure 71 psi (5 kg/cm2 ).
  5. Test nozzle again to ensure opening pressure is correct, then check for leakage.
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