LUBRICATION SYSTEM
TESTING AND ADJUSTING LUBRICATION SYSTEM
One of the problems in the list that follows will generally be an indication of a problem in the lubrication system for the engine.
MEASURING ENGINE OIL PRESSURE Tools Needed: 6V3150 Engine Pressure Group or 5P6225 Hydraulic Test Box.
TOO MUCH OIL CONSUMPTION OIL PRESSURE IS LOW OIL PRESSURE IS HIGH 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. Check to see if oil comes out of 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, and this will cause gasket and seal leakage.
INSTRUMENT PANEL An oil pressure gauge that has a defect can give an indication of low or high oil pressure.
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: 1.
Oil leakage between worn valve guides and valve stems.
2.
Worn or damaged piston rings, or dirty oil return holes in the piston.
3.
Compression ring and/or intermediate ring not installed correctly.
4.
6V3150 ENGINE PRESSURE GROUP 1. Differential pressure gauges. 2. Zero adjustment screw. 3. Pressure gauge 0 to 1100 kPa (0 to 160 psi). 4. Pressure tap. 5. Pressure gauge 0 to 415 kPa (0 to 60 psi).
Oil leakage past the seal rings in the impeller end of the turbocharger shaft.
Too 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.
The 6V3150 Engine Pressure Group can be used to measure the pressure in the system. This tool group has a gauge to read pressure in the oil manifold. Special Instruction Form No. SEHS7851 is with the tool group and gives instruction for its use.
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