Posted by wore out on December 10, 2021 at 06:31:43 from (64.255.159.199):
In Reply to: Ford 8n low oil pressure posted by Midwest farmer on December 09, 2021 at 20:06:36:
[quote="Midwest farmer"](quoted from post at 21:06:36 12/09/21)
"good gears inside"
Define "good gears".
Did you mic them and check against correct tolerances?
Did you verify there's only a few thousandths of clearance between the gears and the cover with Plastigauge?
(The reason I ask this is that there have been reports of aftermarket replacement gears being sold made to incorrect dimensions.)
Go down lower on the page and ask about this on the "N"-specific Board, contributor "TOH" is the GURU of these pumps.
Did you replace the bushing and have it bored to size correctly?
Be aware that (as with any gear pump) if the shaft bushing was badly worn the gear will contact the housing around it and mill it away. Then, when a new gear, shaft and bushing is installed the gear will again be centered, leaving excess clearance between the teeth and housing in that worn area, resulting in an internal oil leak resulting in less flow/pressure to the engine.
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