CLIP 2775065 - 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 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 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
An oil pressure gauge that has a defect can give an indication of low oil pressure.
Illustration 1 g00293196
1U-5470 Engine Pressure Group The 1U-5470 Engine Pressure Group measures the oil pressure in the system. This tool group has a gauge that monitors the oil pressure inside the oil manifold.Note: Refer to Special Instruction, SEHS8524 for more information on using the 1U-5470 Engine Pressure Group .
Be sure that the engine is filled to the correct level with SAE 10W-30oil. The information in the engine oil pressure graph is invalid for other oil viscosities.
Illustration 2 g00346032
Oil manifold on the left side of the engine (1) Pressure test location.
Connect the 1U-5470 Engine Pressure Group to the main oil manifold at location (1) .
Obtain the normal operating temperature of the engine by operating the engine.
Keep the oil temperature constant with the engine at the rated rpm, and read the pressure gauge.Note: The engine oil temperature should not exceed115°C (239°F).
Locate the point that intersects the lines for the engine rpm and for the oil pressure on the engine oil pressure graph.
Illustration 3 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. The 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