UENR0623-02 73 Lubrication System Lubrication System 3. Look for cracks in the metal or other damage to the engine oil pump. If necessary, replace the engine oil pump. 4. Install the oil pump on the engine. i04169630 Engine Oil Pressure - Test 5. Remove the engine oil pressure relief valve from the engine. 6. Inspect the engine oil pressure relief valve for wear of for damage. If necessary, replace the engine oil pressure relief valve. Low Oil Pressure The following conditions will cause low oil pressure. i04027269 Excessive Bearing Wear - Inspect The oil level is low in the crankcase. A restriction exists on the oil suction screen. Connections in the oil lines are leaking.
The connecting rod or the main bearings are worn. When some components of the engine show bearing wear in a short time, the cause can be a restriction in an oil passage. The rotors in the oil pump are worn. The oil pressure relief valve is operating incorrectly. An engine oil pressure indicator may show that there is enough oil pressure, but a component is worn due to a lack of lubrication. In such a case, look at the passage for the oil supply to the component. A restriction in an oil supply passage will not allow enough lubrication to reach a component. Early wear will result. A worn oil pressure relief valve can allow oil to leak through the valve which lowers the oil pressure.
The minimum oil pressure at a maximum engine speed of 2200 rpm and at normal operating temperature is 400 to 480 kPa (58.016 to 69.619 psi) . A lower pressure is normal at low idle. Refer to Specifications for more information regarding component wear limits. A suitable pressure gauge can be used in order to test the pressure of the lubrication system. i02414692 Excessive Engine Oil Consumption - Inspect High Oil Pressure High oil pressure can be caused by the following conditions. The spring for the oil pressure relief valve is installed incorrectly. Engine Oil Leaks on the Outside of the Engine The plunger for the oil pressure relief valve becomes jammed in the closed position.
Check for leakage at the seals at each end of the crankshaft. Look for leakage at the gasket for the engine oil pan and all lubrication system connections. Look for any engine 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. Excessive sludge exists in the oil which makes the viscosity of the oil too high. i04484013 Engine Oil Pump - Inspect Engine Oil Leaks into the Combustion Area of the Cylinders 1. Remove the oil pump from the engine.
Engine oil that is leaking into the combustion area of the cylinders can be the cause of blue smoke. There are several possible ways for engine oil to leak into the combustion area of the cylinders: 2. Clean the engine oil pump.