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Ford 9N, 2N & 8N Discussion Forum
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Re: 2n new build losing prime

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TheOldHokie

06-19-2020 18:59:42




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I heard you the first time and I gave you something to check. Dont assume anything. Use a micrometer and check the actual dimension of one of your "new 3/4" gears". It should measure .725.. There are lots of junk kits on the market with new gears that are roughly .010 undersize. Let me repeat, those kits are unusable JUNK and will not pump reliably.

Your new oil pump housing is also a main bearing cap. Caps and blocks are bored as a matched assembly by the factory. You cannot simply swap caps from one block to another. If you replace ANY cap on an engine block you have to rebore the block and other caps to match. If you dont the bearing bore of the new cap will be out of round and alignment with the other bearing bores. This is basic engine building 101.

TOH

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Thecardoc

06-19-2020 19:30:17




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 Re: 2n new build losing prime in reply to TheOldHokie, 06-19-2020 18:59:42  
In my initial post I said I had it lined bored. Every part I purchased came from YT. Except my engine kit. There was no attitude in any of my replies, calm down. Was in the middle of putting everything back together when I responded, I checked the gears with my dial caliper.



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