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Subject: ford 8n

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john    Posted 11-06-2017 at 20:38:47 [URL] [DELETE]        [Reply] [Email]  
  • ford 8n
  • My ford 8n s# looks to be 8n 396405 I am looking for a oil pump replacement and cant fine anything that matches those s# anyone have any ideas


    HCooke    Posted 11-07-2017 at 09:22:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: ford 8n
  • Been a lot of discussion about this on YT recently. Important - if you replace the oil pump you will have to have the engine line bored! If you have your oil pump repaired with new bushing and gears that will not be necessary. Dan Allen aka TOH repairs oil pumps. I would try and contact him.

    Steve Dabrowski    Posted 11-07-2017 at 22:38:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Harold's recommendation to have Dan redo your pump is a good one. Dan will take care and fully check it out I am sure. He has a setup to run it to check it's performance as well as I recall from one of his past posts.

    If you decide to do it yourself with new parts be careful to ensure the new gears fit so they are flush with the front face of the pump, if not, the end clearance may be too much and you will experience low pressure. I had the experience of rebuilding the pump with one of the kits and after installing had pressure of about 8 psi at idle and maybe 15 psi at normal speed and temperature. turned out the new gears were about 0.007" shorter than original and the gasket was about 0.008" thick giving about 0.015" end clearance. I put the old gears back in which came up flush and got a new gasket from New Holland that was 0.005" thick. That solved the problem and pressure remains normal ever since.

    TheOldHokie    Posted 11-08-2017 at 10:40:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Steve,

    I have complete Ford factory specifications including face width for the wider (8N-6614/8N-6610) gears. My assumption is all of that data is the same for the narrow (52-6614/52-6610) gears but I have been unable to get a definitive number for the face width on those gears. Do you have a reliable number for face width on the 52-xxxx gears?

    TOH

    Steve Dabrowski    Posted 11-08-2017 at 22:02:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Hi Dan,

    Afraid I'm not much help on this. I only measured the early (1948) 8N gears, and have not kept those dimensions, I remember the replacements from the kit were about 0.007" shorter than the originals. I have not worked with any later pumps with the longer gears. I played with gasket materials from paper bag stuff to 3M sticky back which were the thinnest at 0.003". Oil did not seem to faze that material at all after a week's soak.

    TheOldHokie    Posted 11-08-2017 at 22:36:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • It appears the face width on the early 9/16" gears is indeed 9/16" (.562). That data comes from measuring and checking fit on aftermarket gears.

    The face width on the later 3/4" gears is actually .724/.725. That data comes from original Ford factory print and has been verified as above. I recently removed a set of bad ones from a customer's pump that were .014 short and created a massive problem....

    TOH

    TheOldHokie    Posted 11-08-2017 at 21:01:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Some more info on the issue of bogus rebuild kits can be found here:

    My YT Thread

    TOH

    HCooke    Posted 11-09-2017 at 10:51:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: ford 8n
  • I guess I have been incredibly lucky. I have rebuilt several N engines and have excellent oil pressure in all of them. I had several machine shops do the work.

    TheOldHokie    Posted 11-09-2017 at 11:24:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Not so much luck as good parts and knowledgeable rebuilder. Based on what I am seeing it looks like the rebuild kits from the bigger players (AI/Sparex/Tisco) are probably OK. I suspect the problem ones are the lower cost kits that have suddenly popped up on places like eBay. There a couple eBay sellers that are advertising money back and free return shipping so I am going to buy a couple kits from one of them and see how they look. I seem to be getting a lot of pumps these days and
    I like to have one of each flavor on hand so I can turn a pump around without having to wait for parts.

    TOH

    Steve Dabrowski    Posted 11-08-2017 at 22:08:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Interesting, seems to agree with what I experienced, however my kit came from Just 8N's also. Best to always check before going forward. I also had the shaft issue and had to stake around the new shaft to make old gears fit correctly.

    Randy(PA)    Posted 11-07-2017 at 00:30:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Which oil pump?

    BlasterStumps    Posted 11-07-2017 at 00:05:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: ford 8n
  • by that SN, it looks like it might be a 1951. Just8Ns lists a repair kit.

    AL CT    Posted 11-06-2017 at 20:59:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8n
  • Are you looking for a complete oil pump? There is no part number for the complete pump assembly. Individual parts are available, refer to the master parts catalogue for numbers. Very easy to rebuild. Call Just8N's for parts availability. Check out their site listed in the links section of the red bar on the home page.
    Hope this helps.

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