LINES GP-TURBOCHARGER OIL 5I7770 - Caterpillar

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
Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1U-5470     Engine Pressure Group     1    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 .
Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Be sure that the engine is filled to the correct level with SAE 10W-30 oil. 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 exceed 115°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 psi) and the oil pressure is in the "ACCEPTABLE" range. The engine should be inspected and the problem should be corrected.Oil Pressure is Low
Crankcase Oil Level
Check the level of the oil in the crankcase. Add oil if oil is needed. The oil level can 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.