Oil Pump: Description and Operation

DESCRIPTION
The gerotor type oil pump has the following characteristics:
^ It is a positive displacement, internal gear pump using top seal rotors.
^ It is mounted on the front face of the cylinder block.
^ The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft.

PRESSURE
^ System pressure is limited by an integral, internally vented relief valve which directs the bypass oil back to the inlet side of the oil pump.
^ Relief valve calibration protects the system from excessive pressure during high viscosity conditions yet is designed to provide adequate lubrication under high temperature and high speed conditions.
^ Oil pump displacement has been selected to provide adequate volume to ensure proper oil pressure both at hot idle and maximum speed.