SEAL 3866028 - 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.
Too Much Oil Consumption
Low Oil Pressure
High Oil Pressure
Too Much Bearing Wear
Increased Oil Temperature Too Much 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 or damaged pistons, piston rings, or dirty oil return holes in the piston
Incorrect installation of the compression ring and/or the intermediate ring
Oil leakage past the seal rings in the impeller end of the turbocharger shaftToo much 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
Table 1
Tools Needed     Quantity    
1U-5470 Engine Pressure Group     1    An oil pressure gauge that has a defect can give an indication of low oil pressure or high oil pressure.
Illustration 1 g00284796
1U-5470 Engine Pressure Group (1) Pressure indicators. (2) Zero adjustment screw. (3) Pressure indicator. (4) Pressure tap. (5) Pressure indicator.The 1U-5470 Engine Pressure Group can be used in order to measure the pressure in the system. This tool group has a gauge in order to read pressure in the oil manifold. Special Instruction, SEHS8524 is with the tool group and gives the instructions.
Illustration 2 g00322890
Oil Gallery Plug (Typical Example) (6) 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 (6). With the engine at operating temperature, the minimum oil pressure at full load rpm should be approximately 280 kPa (40 psi). Minimum oil pressure at low idle rpm should be approximately 140 kPa (20 psi).Oil Pressure Is Low
Crankcase Oil Level
Check the level of the oil in the crankcase. Add oil if oil is needed. It is possible for the oil level to be too far below the oil pump supply tube. This will cause the oil pump not to 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