When rebuilding or checking a TR3 oil pump the maintenance manual states the end float between the rotors and the end plate should be 0.0005" to 0.0025". How do you make this measurement? I would think you'd remove the end plate, turn the pump upside down and check any clearance between the rotors and bottom of the upper portion of the pump. Is this correct? On my car, most of the time the oil pressure is 70 psi; however, after the engine becomes hot (not overheating) it may drop to between 50 and 70 at speed and as low as 20-25 psi at idle making me think the end float on the oil pump may be excessive.