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Opening Pressure
- Blow out any dirt around injection nozzles, then remove fuel lines and nozzles. Mark nozzles for correct installation.
- 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.
- 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
).
- 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
).
- Test nozzle again to ensure opening pressure is correct, then check for leakage.