3306 VEHICULAR ENGINE FOR D5B, D6D & D7G TRACTORS – Engine Oil Pressure

All steps of this procedure must be followed for the pressure findings to be usable.

Step 1. Be sure that the engine is filled to the correct level with either SAE 10 or SAE 30 oil. If any other visocisty of oil is used, the information in the ENGINE OIL PRESSURE CHART does not apply.

Step 2. Find a location on the engine oil manifold to install a tee. The easiest method is to remove the sending unit for the present gauge and install a tee at this location. Install a probe from the 9S9102 Thermistor Thermometer Group in one side of the tee. Connect a 8M2744 Gauge from the 5P6225 Hydraulic Test Box to the other side of the tee.

Step 3. Run the engine to get the oil temperature at 210°F (99°C).

NOTE: A 5°F (3°C) increase in oil temperature gives approximately 1 psi (7 kPa) decrease in oil pressure.

Step 4. Keep the engine oil temperature constant. With the engine at the rpm from the chart, read the pressure gauge.

Make a comparison between the pressure reading on the test gauge and the minimum permissible pressure from the ENGINE OIL PRESSURE CHART. If the pressure reading on the test gauge is below the minimum permissible pressure, find the cause and correct it. Operation of the engine with low oil pressure can be the cause of engine failure or of a reduction in engine life.

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