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Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Table 1
Required Tools    
Part Number     Part Description     Qty    
1U-5470     Engine Pressure Group     1    
Illustration 1 g00296486
1U-5470 Engine Pressure Group The 1U-5470 Engine Pressure Group measures the oil pressure in the system. This engine tool group can read the oil pressure inside the oil manifold.Note: Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group " for more information on using the 1U-5470 Engine Pressure Group .Note: The engine oil pressure can also be measured by using Caterpillar Electronic Technician (Cat ET). Refer to Troubleshooting for information on the use of Cat ET.
Illustration 2 g00293197
Location of the oil gallery plug (1) Oil gallery plug
Illustration 3 g02475876
(2) Alternate location of the oil gallery plug
Install the 1U-5470 Engine Pressure Group into oil gallery plug (1) .Note: Engine oil pressure to the camshaft and main bearings should be checked on each side of the cylinder block at oil gallery plug (1) .
Start the engine. Run the engine with SAE 10W30 or SAE 15W40 oil. The information in the engine oil pressure graph is invalid for other oil viscosities. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for the recommendations of engine oil.Note: Allow the engine to reach operating temperature before you perform the pressure test.
Record the value of the engine oil pressure from pressure testing port when the engine has reached operating temperature.
Locate the point that intersects the lines for the engine rpm and for the oil pressure on the engine oil pressure graph.
Illustration 4 g00293198
Engine oil pressure graph
The results must fall within the "ACCEPTABLE" range on the chart.A problem exists when the results fall within the "NOT ACCEPTABLE" range on the chart. This problem needs to be corrected. Engine failure or a reduction in engine life can be the result if engine operation is continued with oil manifold pressure outside this range.Note: A record of engine oil pressure can be used as an indication of possible engine problems or damage. A possible problem could exist if the oil pressure suddenly increases or decreases 70 kPa (10 psi) and the oil pressure is in the "ACCEPTABLE" range. The engine should be inspected and the problem should be corrected.
Compare the engine oil pressure from Step 3 with the other oil pressure indicators that are for the engine.
An engine oil pressure indicator that has a defect or an engine oil pressure sensor that has a defect can give a false indication of a low oil pressure or a high oil pressure. If there is a notable difference between the engine oil pressure readings make necessary repairs.
If a low engine oil pressure condition is confirmed, refer to "Reasons for Low Engine Oil Pressure".
If engine oil pressure is above the specification, refer to "Reason for High Engine Oil Pressure".Reasons for Low Engine Oil Pressure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Oil level is low. Refer to Step 1.
Oil is contaminated. Refer to Step 2.
Engine oil bypass valves are open. Refer to Step 3.
The lubrication system is open. Refer to Step 4.
The oil suction tube has a leak or a restricted inlet screen. Refer to Step 5.
The engine oil pump is faulty. Refer to Step 6