LUBRICATION SYSTEM - TM-5-3805-263-14P-2

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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LUBRICATION SYSTEM TM 5-3805-263-14&P-2 TESTING AND ADJUSTING LUBRICATION SYSTEM One of the problems in the following list will generally be an indication of a problem in the lubrication system for the engine. TOO MUCH OIL CONSUMPTION OIL PRESSURE IS LOW OIL PRESSURE IS HIGH TOO MUCH BEARING WEAR 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 is coming 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. Oil Leakage Into Combustion Area of Cylinders Oil leakage into the combustion area of the cy- linders can be the cause of blue smoke. There are four possible ways for oil leakage into the combus- tion 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. 3. Compression ring not installed correctly. 4. Oil leakage past the seal rings in the impeller end of the turbocharger shaft. Too much oil consumption can also be the result of using oil with the wrong viscosity. Oil with a thin viscosity can be caused by fuel getting in the crank- case, or by the engine getting too hot. OIL PRESSURE IS LOW An oil pressure gauge that has a defect can give an indication of low oil pressure. Check the gauge with a test gauge. Use the procedure that follows to check engine oil pressure. Do the procedure exactly or the pressure measurements are not good for comparison with the chart. 1. Be sure that the engine is filled to the correct level with either SAE 10 or SAE 30 oil. If any other viscosity of oil is used, the information in the engine oil pressure chart is not good. 1-62 2. 3. Find a location on the engine oil manifold to install a tee. The easiest method is to remove the sending unit for the present gauge and install a tee at this location. Install a probe from the 9S9102 Thermistor Thermometer Group in one side of the tee. Connect an 8M2744 Gauge from the 5P6225 Hydraulic Test Box to the other side of the tee. Run the engine to get the engine oil temperature at 210°F (99°C). NOTE: A 5° F (3°C) increase in temperature gives approximately 1 psi (7 kPa) decrease in engine oil pressure. 4. Keep the engine oil temperature constant. With the engine at the rpm from the chart, read the pressure gauge. Make a comparison between the pressure reading on the test gauge and the mini- mum permissible pressure from the ENGINE OIL PRESSURE CHART. If the pressure reading on the test gauge is below the minimum permissible pressure, find the cause and correct

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