G3304 and G3306 Engines Caterpillar

The 1U-5470 Engine Pressure Group measures the engine oil pressure in the system. This engine tool group can read the engine oil pressure inside the engine oil manifold. Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group" that is included with the tool.

1. Ensure that the engine is filled to the correct level with either SAE 30 or 40 of engine oil. If any other viscosity of oil is used, the information in Table 2 cannot be used.
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   Illustration 1	g00676796
   Pressure test location (1) Location for the pressure test

2. Connect the 1U-5470 Engine Pressure Group to location (1) on the engine block above the flywheel housing.

3. Operate the engine. When the engine oil has achieved a temperature of 99 °C (210 °F), read the pressure gauge and record the pressure.

   Note: An increase in the engine oil temperature of 3 °C (5 °F) will reduce the engine oil pressure by approximately 7 kPa (1 psi).

4. Refer to Table 2 in order to determine if the engine oil pressure is acceptable.
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   Table 2

   Engine Oil Pressure
   Test RPM	Oil SAE	Minimum Permissible Pressure
   1500 or above	30 40	165 kPa (24 psi)

   If the results of the test do not agree with Table 2, determine the cause and correct the condition. Otherwise, engine failure or a reduction in engine service life can result.

   If the engine oil pressure is low, refer to Testing and Adjusting, "Engine Oil Pressure is Low" for the possible causes of low engine oil pressure.

   If the engine oil pressure is high, refer to Testing and Adjusting, "Engine Oil Pressure is High" for the possible causes of high engine oil pressure.

5. Compare the recorded engine oil pressure with the engine oil pressure indicator on the instrument panel.

   A faulty engine oil pressure indicator or a faulty sensor can provide false indications of low engine oil pressure or high engine oil pressure. If there is a notable difference between the engine oil pressure readings, determine the cause.

Note: A record of engine oil pressure can be used as an indication of possible engine problems or damage. A sudden change of 70 kPa (10 psi) in the engine oil pressure may indicate a problem. Inspect the engine and correct the problem.