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.
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HOMESERVICE MANUALSMAZDA1987B SERIES TRUCK L4-2000 1998CCREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINEENGINE LUBRICATIONOIL PUMPTESTING AND INSPECTION
1987 Mazda B Series Truck L4-2000 1998cc
Oil Pump: Testing and Inspection
1987 Mazda B Series Truck L4-2000 1998ccSECTION Testing and Inspection
OIL PRESSURE
Inspection
1. Remove the oil-pressure switch.
2. Connect the oil-pressure gauge (49 0187 280) to the pressure switch installation hole in the cylinder block.
3. Start the engine and let it warm up.
4. Maintain engine rpm at 3000, and note the gauge reading.
- Standard oil pressure: 249-392 kPa (3.0-4.0 kg/cm2 sq, 43-57 psi)
5. If the pressure is lower than specified, check each part, and repair if necessary.
Inspection
1. Remove the oil-pressure switch.
2. Connect the oil-pressure gauge (49 0187 280) to the pressure switch installation hole in the cylinder block.
3. Start the engine and let it warm up.
4. Maintain engine rpm at 3000, and note the gauge reading.
- Standard oil pressure: 249-392 kPa (3.0-4.0 kg/cm2 sq, 43-57 psi)
5. If the pressure is lower than specified, check each part, and repair if necessary.
RENDER: 1.0x
NO RELATED
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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.