L U B R I C A T I O N S Y S T EMLUBRICATION SYSTEMTM 5-3805-258-24-1T E S T I N G A N D A D J U S T I NGOne of the problems in the following list will gener-ally be an indication of a problem in the lubricationsystem for the engine.TOO MUCH OIL CONSUMPTIONOIL PRESSURE IS LOWOIL PRESSURE IS HIGHTOO MUCH BEARING WEARTOO MUCH OIL CONSUMPTIONOil Leakage on Outside of EngineCheck for leakage at the seals at each end of thecrankshaft. Look for leakage at the oil pan gasketand all lubrication system connections. Check to seeif oil is coming out of the crankcase breather. Thiscan be caused by combustion gas leakage around thepistons. A dirty crankcase breather will cause highpressure in the crankcase, and this will cause gasketand seal leakage.Oil Leakage Into CombustionArea of CylindersOil leakage into the combustion area of the cy-linders can be the cause of blue smoke. There are fourpossible ways for oil leakage into the combustionarea of the cylinders.1.2.3.4.Oil leakage between worn valve guides and valvestems.Worn or damaged piston rings or dirty oil returnholes.Compression ring not installed correctly.Oil leakage past the seal rings in the impeller endof the turbocharger shaft.Too much oil consumption can also be the result ofusing oil with the wrong viscosity. Oil with a thinviscosity can be caused by fuel getting in the crank-case, or by the engine getting too hot.OIL PRESSURE IS LOWAn oil pressure gauge that has a defect can give anindication of low oil pressure. Check the gauge with atest gauge.1. Be sure that the engine is filled to the correctlevel with either SAE 10 or SAE 30 oil. If anyother visocity of oil is used, the information inthe engine oil pressure chart does not apply.2. Remove oil pressure line from rear of cylinderblock and install a tee in its place. Install a probefrom the 9S9102 Thermistor ThermometerGroup in one side of the tee. Connect an8M2744 Gauge from the 5P6225 Hydraulic TestBox to the other side of the tee.5 P 6 2 2 5 H Y D R A U L I C T E S T B O X3. Run the engine to get the engine oil temperatureat 99°C (210°F).NOTE: A 3°C (5°F) increase in temperature givesapproximately 7 kPa (1 psi) decrease in engine oilpressure.4. Keep the engine oil temperature constant. Withthe engine at the rpm from the chart, read thepressure gauge. Make a comparison between thepressure reading on the test gauge and the mini-Use the following procedure to check engine oilpressure. Do the procedure exactly or the pressuremeasurements are not good for comparison with thechart.4-29
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