Oil pump gasket
- Thread starter Randy/In
- Start date
The gears don't want to be a tight fit against the plate. I would guess about .0005 to .001 clearance which should listed somewhere in the Ford service bulletins. The clearance I gave is about the thickness of a film of oil in a bushing or bearing. This is one of the reasons I have posted for years to test every oil pump with the drive gear removed and powered by a 1/2" drill. The pump direction is the same as drilling a hole. Attached picture shows my simple pump tester. G.M.
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I don't have other pictures. The heavy wall plastic tube is bored .008 to .010 smaller than the 2 OD's of the pump that go in the block. This allows you to tap it in the pump to seal it. There is a hole drilled and taped 1/8" pipe in the center, don't tap the threads to deep or the pipe will not allow the plastic tube to go on. Use a nipple, tee, gauge and a barb fitting for the plastic tube. Put a quart of oil in the drain pan with the pump pick up in the oil and turn the drill on. It will pump in about 2 or 3 turns of the drill. Bend the tube to put restriction in the flow of oil. The more restriction the higher the pressure. These pumps will pump 80 or 90 ibs pressure. You need the restriction to see that the pump makes pressure. A bad pump will pump oil just by turning the drive gear by hand but as soon as it gets a restriction it doesn't make any pressure. The output pressure can the be adjusted by the bypass valve on the later pumps or the valley bypass on the early ones. Spin the engine with the plugs out on 12 volts to adjust the valley bypass. G.M.
