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Ford 9N, 2N & 8N Discussion Forum

Re: 2n new build losing prime

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Author  [Modern View]

06-19-2020 20:39:40

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Face width of .724 is right on. The bad ones are typically around .710. But apparently something in that pump is not right. Measure tip clearance to housing with a feeler gauge. Should be just a few rhousandths. Also measure end clearance with a good straight edge and feeler gauge. Remove all traces of gasket and sealer then set straight edge on face of housing and measure gap between gear and straight edge with the feeler gauges. Should also be just a few thousandths.

Which brings us to the unasked question. You replaced original oil pump and pickup tube. Why?


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06-20-2020 10:37:38

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 Re: 2n new build losing prime in reply to TheOldHokie, 06-19-2020 20:39:40  
Okay, just pulled it down again. The edge of tooth to wall clearance is tight on a .005 brass feeler. The face of the driven gear to pick up back plate (straight edge) is between .006 and .007. The drive gear is way more. Low and behold, the drive gear face to face is .710. The driven gear is .724. When I had it line bored I got the machine shop to go ahead and press the gear on for me. Between me and dropping of the kit(unopened package) and getting it back, either a gear got switched (most likely) or it was packaged wrong (not like from yt). I'm not happy, machine shop has some questions to answer. I did knock it off myself to check the measurements. It's a mess.

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06-22-2020 21:20:29

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 Re: 2n new build losing prime in reply to Thecardoc, 06-20-2020 10:37:38  
Several people have had trouble with the Atlantic brand oil pump kits sold by YT.

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06-19-2020 20:50:06

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 Re: 2n new build losing prime in reply to TheOldHokie, 06-19-2020 20:39:40  
Housing had a crack from outside face of fear shaft into center of pump housing. This engine was not oiling before. Pick up had been severely abused in the past 70 years. I will pull it and check all tomorrow and let you know.

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