FUSO 4M4 – LUBRICATION – ON-VEHICLE INSPECTION AND ADJUSTMENT – Oil Pressure Measurement

• Remove the engine oil pressure switch.

• Using an adapter, connect an oil pressure gauge to the engine oil pressure switch mounting hole.
• Warm up the engine until the oil temperature reaches 70 to 90 °C.
• Measure the oil pressure while running the engine at a minimum speed and then at maximum speed, both under no load.
• If the measurements are below the specified limits, overhaul the lubrication system.
• After taking the measurements, apply sealant to the threads of the oil pressure switch and tighten the switch to the specified torque.