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Subject: 8N oil pump issue

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Russ Moser    Posted 05-12-2020 at 20:36:36 [URL] [DELETE]        [Reply] [Email]  
  • 8N oil pump issue
  • My 52 8N will not have any oil pressure when started after not being used for a few days. I have checked the pick-up and it is solid. When I prime it by squirting oil in the pressure spring hole on the front of the engine it comes up right away and is fine from then on, as long as it doesn't sit too long before the next start. This priming has never failed to work and I've done it many times. The tractor has a lot of other issues but I think I could handle most of them or live with them. I decided a while back that I would always have an 8N because I really like the size and style. I really don't do much with it-it's mostly just a toy. I don't care if it doesn't look pretty or if everything works perfectly. However, I want it to start up and go when I jump on. This oil pump business is unacceptable. What I don't want to even attempt is anything inside the engine. My question is if I have someone remove the oil pump and rebuild it or I have it rebuilt, is it possible/likely they will say they can't just put it back together and it needs a complete rebuild? I'm looking at one with a rebuilt engine that's all painted up but it's expensive. I'm wondering if there is a cheaper way to go like doing the oil pump only. Is that possible?

    Dave H    Posted 05-15-2020 at 10:03:36 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N oil pump issue
  • If it is running OK I don't see that it would need a complete rebuild. However once you go far enough to reman that oil pump (and make sure the pick up is faultless, to me it would be just few more buck to slick up the rest of it.

    is what i did with mine.

    TheOldHokie    Posted 05-13-2020 at 03:29:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N oil pump issue
  • The oil pump can be serviced by removing the oil pan. That entails several hours work so if paying to have it done expect a substantial bill. Your problem us a common one and there is no guarantee a rebuild kit will fix your problem. Paying professionals to maintain 70 year old tractors makes them expensive toys.

    TOH

    Scott    Posted 05-12-2020 at 20:41:39 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N oil pump issue
  • To get to the oil pump, the whole oil pan must come off. This means removing the front suspension. the oil pump is integral with the front main cap. In my opinion, it would be easier to pull the motor and freshen it up while you're at it.

    John    Posted 05-13-2020 at 09:54:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N oil pump issue
  • Had one like that once. Found out that if we parked it with the rear end higher or the front wheels in a small ditch that it would always pick up presure. Always ran 30wt oil instead of 10w30. Helped also.

    steveVa    Posted 05-15-2020 at 07:30:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N oil pump issue
  • John's idea of 30wt is a good one. If the pump works fine once it is primed I would not think it needs rebuilt. Sounds more like an issue with the pick up tube. I would add another qt of oil and also make sure you don't have gas in your oil from a sticky carb float.

    TheOldHokie    Posted 05-15-2020 at 19:10:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N oil pump issue
  • In attempt to understand this problem I went to the trouble of building a bench test rig for the oil pump. I could put what looked like a perfectly good rebuilt pump on the rig, prime it, and it would pump like crazy, Let it set for 30 minutes and it pumped fine. Let it set for 2-3 hours and it would not pump without priming. There is more to this problem than meets the eye and it is not the pickup system.

    TOH

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