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| Joined: | 03-12-2005 |
| Location: | Kingman, Arizona USA |
| Posts: | 532 |
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The oil pump clearance specs are all in the shop manual, and I've repeated them below, with comments.
Inner and outer rotor clearance: 0.006" max.
This is the lobe to gulley clearance between the two rotors. In my car it's about 0.007" with no apparent ill effect. As Judson notes, this clearance helps determine the maximum pressure available when the oil is hot.
Inner and outer rotor float: 0.000,5" min, 0.001,5" max.
This is the total gap between the flat faces of either rotor and the flat floor/roof of the cavity where the rotors sit. This is the most critical clearance in the oil pump, as the pump loses the ability to prime itself when the clearance exceeds 0.004" or so. The thickness of the gasket between oil pump casting and aux. housing casting affects this clearance.
Outer rotor to housing clearance: 0.001" min, 0.003" max.
This is the clearance between the outer edge of the outer rotor, and the side wall of the cavity in the oil pump casting. In my car it's about 0.006" with no apparent ill effect.