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Subject: Thermostat

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Robert Angney    Posted 08-19-2020 at 16:20:16 [URL] [DELETE]        [Reply] [Email]  
  • Thermostat
  • Hi Tim, If I were to replace the upper radiator hose on my ford 9n, would I have to replace the thermostat also?

    Tim Daley(MI)    Posted 08-21-2020 at 06:13:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thermostat
  • FORD TRACTOR 9N Radiator upper hose is part number 9N-8260, 1.5" ID; 1-7/8" OD; 7-9/16" long. The short length was used on the early non-pressurized radiator. When the 2N-8005 Pressurized radiator was released, it also now used a longer upper hose. The 2N hose is 10" long, used thru the 8N Model. Check your radiator for the correct hose. If you have the 2N Pressurized Radiator, you'll need the 2N-8260 hose. Here is a LINK to find a reliable supplier for all your parts. The DC upper hose includes the thermostat band too. DC also has the lower hose and OEM style hose clamps too.

    Tim Daley(MI)

    Tim Daley(MI)    Posted 08-20-2020 at 06:50:58 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thermostat
  • HiYa Robert-
    Bruce(VA) is the resident guru on many Ford Tractor systems, cooling included. One article he wrote in The N-News last year -see pages/pix below, was on the cooling system. What is wrong with your current hose - dry rotted, cracked, leaking? Are you certain you have a thermostat now? As Bruce said, you could use the old Thermostat. Your tractor, you can do what you want. I'd suggest replacing with new both thermostat and hose and clamps if you need to. It goes against my usual advice to not but new parts until old is determined to be defective, but this is one of the areas that isn't a difficult job, just time consuming as other parts need to be removed first. How's your water pump? Generator? If generator fan belt tension isn't maintained, pump won't function properly as well as gen not charging. There are other things to consider is what I am saying. To continue, I'd drain some coolant out of radiator first via the petcock on the bottom of radiator. Originally FORD used a rectangular thermostat -see picture- that held a band on the outer hose to keep the unit from sliding forward towards the engine. No longer made, many of us just use another hose clamp or a simple plastic wire tie. New thermostat is inserted in upper hose with pointed end towards radiator. If water pump and/or generator (new belt?) need attention, now is the time. Be sure fan belt tension is correctly set. Coolant level correct, do not overfill, see article.


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    Tim Daley(MI)

    Robert Angney    Posted 08-20-2020 at 10:44:34 [URL] [DELETE]        [Reply] [Email]  
  • Re: Thermostat
  • The only thing that needs attention is the hose, it is old and dry rotted. Do auto part stores have the hoses?

    Bruce (VA)    Posted 08-20-2020 at 11:58:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: Thermostat
  • Top hose is straight . should be easy to find. But the bottom hose is molded, so what they will try to sell you is a flexible hose. Order both from Just8N's and don't worry about it.

    Bruce ( VA)    Posted 08-19-2020 at 17:26:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: Thermostat
  • The old one should slide out.

    No need to replace it unless you want to install a 180* t-stat. Which I recommend.

    See tip # 25 at the link.

    If you want to use a 180* t-stat (which I use on all 4 of my 8N's) try A&I part # A-11C15, Gates 33108, Beck/Arnley part # 143-0024, Auto Zone part # 3518 or NAPA part number THM 184 for 180* in hose t-stats.

    The car parts store folks are helpless w/o vehicle make/model/year info.
    Some can/will actually search on the number & cross reference, but more often than not, you will just get a dumb look. HINT: find a clerk near the age of your tractor..... ;) Try telling them that the t-stat is for your 1977 Renault R12 1.6L L4.

    All of my 180* t-stats are A&I A-11C15's or AZ-3518's. They are a very tight fit in an N hose, but they will fit. I've never used the Gates, Beck/Arnley or NAPA t-stats so I can't help you w/ anything there but the part numbers.

    All that being said.....if you do not consistently run the tractor to operating temp, you will get condensation & sludge as a result.



    Robert Angney    Posted 08-20-2020 at 16:52:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: Thermostat
  • Is there a way to check the water pump?

    Bruce(OR)    Posted 08-20-2020 at 18:31:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thermostat
  • Easy way is once the thermostat is out, temp replace the upper hose, fill with water and fire it up. You should see water movement in the radiator. Water level should just slightly cover the fins to see the best action.

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