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Subject: Oil pressure and tune up

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Theo Morris    Posted 07-25-2018 at 15:24:22 [URL] [DELETE]        [Reply] [No Email]  
  • Oil pressure and tune up
  • 1939 9N - I did not get a manual with my tractor. I need to know what the oil pressure should be when hot or cold. Also, what type of engine oil and weight does it take and what type of hydraulic oil and weight. What should the gap be for the points and spark plug? Any assistance you can give me will be greatly appreciated.

    K.LaRue-VA    Posted 07-26-2018 at 10:18:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure and tune up
  • The oil pressure gauge line is a dead-end that can accumulate junk over time and can become completely clogged. Actual oil pressure may be way different from what an ancient original or cheap replacement gauge shows. As others mentioned, "normal" oil pressure varies widely with RPM, temperature, oil type/weight, and engine condition. the manual link below shows that the factory originally recommended, but oils have gotten a lot better over the years. I run a good quality 10/40 multi-grade motor oil and the synthetic (NH-410B) combination tractor fluid year-round in Virginia.

    Andy (KY)    Posted 07-26-2018 at 09:31:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure and tune up
  • Many of the manuals are available in PDF form in the "manuals" section of this website. Most of your question can be answered by the I&T FO-4 manual in the Service/Troubleshooting section. The Ford 9N Tractor Instruction Book in the Tractor section will also help.

    TheOldHoki    Posted 07-26-2018 at 07:16:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Oil pressure and tune up
  • Oil pressure varies with engine condition. At 1500 RPM a good tight engine will produce 40+ PSI at cold startup and hold 30+ when hot. A worn engine will produce similar cold pressure but it will fall to 10 PSI or lower when hot. Anything in between is generally acceptable. Less the 10 PSI hot is a sign things are getting pretty worn.

    The original oil specification was for mono-grade oil to be changed with the seasons - SAE 20 in the summer and SAE 10W in the winter. A modern all season SAE 10W30 is more than acceptable and avoids the need for seasonal changes.

    The original hydraulic oil specification was for mild EP SAE 90 gear oil in the summer and SAE 80 in the winter. A modern UTF is a close match for that and will provide year round service and no need to change on a seasonal basis.


    Bruce (VA)    Posted 07-25-2018 at 15:32:41 [URL] [DELETE]        [Reply] [Email]  
  • Re: Oil pressure and tune up
  • You have an 80 year old tractor; you need the manuals. See tip # 39.

    Your best source for parts is Just8N's.

    Quick answers to the top 10 asked questions from a new N tractor owner:

    1. What year is my tractor? See tip # 71
    2. What hydraulic fluid should I use? See tips 3 & 4.
    3. Do I need to use hi-test gas or an additive? See tip # 5
    4. What engine oil should I use? See tip # 6
    5. My tractor won’t start. See tip # 13
    6. Can I jump start my 6 volt tractor with a 12 volt battery? See tip # 43
    7. I think my tractor needs an in-line gas filter. See tips 15, 45 & 56
    8. When I turn my tractor off the lift arms drop. See tip # 16
    9. My tractor is overheating. See tip # 24
    10. What is the little lever under the seat on my 8N do? See tip # 58

    Point gap is .015; see tips 66, 67 & 68.

    Plug gap is .025; see tip # 7.

    When the engine is at operating temp & idle, 5 lbs of oil pressure is fine; at 3/4 throttle, you should see 30 lbs.

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