CAP 9K0726 - Caterpillar

One of the problems in the list that follows will generally be an indication of a problem in the lubrication system for the engine.
Excessive oil consumption
Low oil pressure
High oil pressure
Excessive wear of the bearings
Increased oil temperature Excessive Oil Consumption
Oil Leakage On Outside Of Engine
Check for leakage at the seals at each end of the crankshaft. Look for leakage at the oil pan gasket and all lubrication system connections. Look for any oil that may be leaking from the crankcase breather. This can be caused by combustion gas leakage around the pistons. A dirty crankcase breather will cause high pressure in the crankcase. A dirty crankcase breather will cause the gaskets and the seals to leak. Oil Leakage Into Combustion Area Of Cylinders
Oil leakage into the combustion area of the cylinders can be the cause of blue smoke. There are four possible ways for oil leakage into the combustion area of the cylinders:
Oil leakage between worn valve guides and valve stems
Worn components or damaged components (pistons, piston rings, or dirty oil return holes)
Incorrect installation of the compression ring and/or the intermediate ring
Oil leakage past the seal rings in the impeller end of the turbocharger shaftExcessive oil consumption can also be the result if oil with the wrong viscosity is used. Oil with a thin viscosity can be caused by fuel leakage into the crankcase or by increased engine temperature.Measuring Engine Oil Pressure
First, check the oil pressure electronically by using the electronic technician. The engine oil pressure and a restriction in the oil filter can be measured with the electronic service tool.
Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1U-5470     Engine Pressure Group     1    An oil pressure gauge that has a defect can indicate low oil pressure or high oil pressure.
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 for more information on using the 1U-5470 Engine Pressure Group.
Illustration 2 g00437624
Oil gallery plug (1) Plug
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). Install the 1U-5470 Engine Pressure Group into this opening. Run the engine with SAE 15W40 oil. While the engine is at operating temperature, the minimum oil pressure at full load rpm should be approximately 275 to 414 kPa (40 to 59 psi). Minimum oil pressure at low idle rpm (600 to 800 rpm) should be approximately 68 kPa (10 psi).Low 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 not to have the ability to supply enough lubrication