SEAL-WINDOW 3153770 - Caterpillar

The engine oil pressure and a restriction in the oil filter can be measured with the electronic service tool.An oil pressure gauge that has a defect can indicate low oil pressure or high oil pressure.
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1U-5470 Engine Pressure Group The 1U-5470 Engine Pressure Group measures the oil pressure in the system. This Engine Pressure Group has a gauge that monitors the oil pressure inside the oil manifold.Note: Refer to Special Instruction, SEHS8907 for more information on using the 1U-5470 Engine Pressure Group.
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Location of Oil Pressure Switch (1) Oil pressure switch.
Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Oil pressure to the camshaft and main bearings should be checked on each side of the cylinder block at oil gallery plug (1). With the engine at operating temperature, the minimum oil pressure at full load rpm should be approximately 250 kPa (36 psi). Minimum oil pressure at low idle rpm should be approximately 100 kPa (14 psi).
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Engine Oil Pressure GraphLow Oil Pressure
Crankcase Oil Level
Check the level of the oil in the crankcase. Add oil if oil is needed. The oil level can possibly be too far below the oil pump supply tube. This will cause the oil pump to NOT have the ability to supply enough lubrication to the engine components.The Oil Pump Does Not Work Correctly
The inlet screen of the supply tube for the oil pump can have a restriction. This restriction will cause cavitation and a loss of oil pressure. Air leakage in the supply side of the oil pump will also cause cavitation and loss of oil pressure. If the bypass valve for the oil pump is held open, the lubrication system can not reach the maximum pressure. Oil pump gears with too much wear cause a reduction in oil pressure.Oil Filter Bypass Valve
If the bypass valve for one or more of the oil filters is held open due to a restriction, a reduction in the oil pressure can be the result. Remove each bypass valve and clean each bypass valve. This allows you to correct the problem. You must also clean each bypass valve bore. Install new Caterpillar oil filters. New filters will prevent more debris from causing this problem.Excessive Clearance At Engine Bearings Or Open Lubrication System
Components that are worn and components that have too much bearing clearance can cause low oil pressure. Low oil pressure can also be caused by an oil line or by an oil passage that is open, broken, or disconnected.Piston Cooling Jets
When the engine is operating, piston cooling jets direct oil toward the bottom of the piston. This cools the piston. This also provides lubrication for the piston pin. A seizure of the piston will occur quickly if a jet experiences any of the following problems:
Breakage
Restriction
Incorrect installationUse the 5P-8709 Cooling Jet Alignment Tool to check the alignment of the piston cooling jets.High Oil Pressure
Oil pressure will be high if the bypass valve for the oil