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Subject: Oil pump

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Bill laughlin    Posted 01-02-2018 at 14:25:03 [URL] [DELETE]        [Reply] [Email]  
  • Oil pump
  • On a oil pump what is the clearance from the gear face to base of pickup tube flange

    TheOldHokie    Posted 01-02-2018 at 14:58:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pump
  • I just answered this question on YT.

    Previous Answer

    End clerance should be as little as possible - certainly no more than .005. As I said on the other forum - some of the aftermarket replacement gears (both 9/16 and 3/4") are undersize and you need to measure new gears to make sure they are the proper width:

    3/4" gears = .724/.725
    9/16 gears = .624/.625

    If your new gears measure less than that they cannot be made to work - return them to the seller along with an explanation of the defect. If enough people complain maybe the problem will get fixed. In the meantime the gears provided in the Tisco kits are known to be correct and it's all I will buy at this point.

    TOH

    poderac    Posted 01-02-2018 at 16:36:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pump
  • I know nothing about the gears, but .624/.625 is 5/8, not 9/16. Was this a typo?

    TheOldHokie    Posted 01-02-2018 at 16:51:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pump
  • Whoops!! Not a typo - a mental lapse. I have a habit of crossing 5/8 and 9/16 when doing decimal equivalences in my head ;-) So:

    Face width on the 9/16" gears should be .561/.562
    Face width on the 3/4" gears should be .724/.725

    Note that the 3/4" gears are actually a bit narrower than .750. I do not know how they came to be called 3/4" gears but that .724/.725 width is straight from the original Ford prints and I am quite sure it's a good number.

    TOH

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