Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1983 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE
Opening Pressure
- Remove injection nozzles from engine and install each nozzle in turn on an injector tester. Test the injectors using diesel fuel at room temperature. Bleed the air out of the tester by pumping the handle several times.
- Slowly lower tester handle and note the pressure shown on gauge when injector nozzle opens. Injection starting pressure should be 1920-1990 psi (135-140 kg/cm2 ). If injection starting pressure is not to specifications, adjust pressure by changing the return spring shim.
- Shims are available in sizes from 0.0197" (0.5 mm) to 0.06" (1.54 mm) in increments of 0.0016" (0.04 mm). Changing shim thickness 1 size should result in a 68 psi (4.8 kg/cm2 ) change in injection starting pressure.
- Using the injector tester, apply 1636-1706 psi (115-120 kg/cm2 ) to injector. No fuel leakage should occur at this pressure range. If leakage does occur, injector must be disassembled and repaired or replaced.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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