SENR9977 43 Testing and Adjusting Section Lubrication System Perform the following procedures in order to inspect the oil pump for clearances and torques. i01854908 Engine Oil Pressure - Test Refer to the Specifications Module, “Engine Oil Pump”. 1. Remove the oil pump from the engine. Refer to the Disassembly and Assembly, “Engine Oil Pump - Remove”. Remove the cover of the oil pump. Low Oil Pressure 2. Remove the outer rotor. Clean all of the parts. Look for cracks in the metal or other damage. The following conditions will cause low oil pressure. 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. The rotors in the oil pump are worn. The oil pressure relief valve is operating incorrectly. A worn oil pressure relief valve can allow oil to leak through the valve which lowers the oil pressure. Refer to the Specifications Module, “Engine Oil Relief Valve” for the correct operating pressure and other information. When the engine runs at the normal temperature for operation and at high idle, the oil pressure must be a minimum of 280 kPa (40 psi). A lower pressure is normal at low idle. g00985779 Illustration 50 Clearance for the outer rotor body A suitable pressure gauge can be used in order to test the pressure of the lubrication system.
(1) Measure the clearance of the outer rotor to the body. 3. Install the outer rotor. Measure the clearance of the outer rotor to the body (1). High Oil Pressure High oil pressure can be caused by the following conditions. The spring for the oil pressure relief valve is installed incorrectly. The plunger for the oil pressure relief valve becomes jammed in the closed position. Excessive sludge exists in the oil which makes the viscosity of the oil too high. i01893791 Engine Oil Pump - Inspect If any part of the oil pump is worn enough in order to affect the performance of the oil pump, the oil pump must be replaced.