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Subject: Transmission disassembly

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Barry    Posted 09-08-2020 at 23:31:10 [URL] [DELETE]        [Reply] [Email]  
  • Transmission disassembly
  • So I had my first post a week ago asking for opinions on how far to go on a restore (was running fine but wanted to clean it up some). I appreciate everyone's opinions as I was looking for different views.
    Fast forward a week, my OCD got the best of me and I now have it completely tore down! Motor is set aside and will be torn down soon, all cases are split and the only thing left is rear pinion assembly and the transmission (pump, lift cover ect are removed)
    My question is this...with average mechanical ability, all manuals and access to any specialty tools I may need, how difficult would the tranny disassembly and reassembly be? Thinking I may leave the pinion in, removing it seems more concerning. Everything else has gone well and I am confident I can reassemble what I have done so far
    I guess the goal here is to see if I can completely disassemble a tractor and make it run again, hopefully close to new condition.
    Again, interested in everyone's opinions
    Thanks

    Steve Dabrowski    Posted 09-12-2020 at 16:16:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Transmission disassembly
  • Transmission Assembly Overhaul - Dealer Mechanic Training [PDF] This is the one I'm talking about. Find under manuals, service and maintenance near the bottom of the category.

    Tim Daley(MI)    Posted 09-11-2020 at 04:38:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Transmission disassembly
  • Barry-
    You will find most everything you need in your Essential Manuals. Our MANUALS forum has some of them and our SUPPORT page has some of the others. This the Service Manual (see LINK) Steve Dabrowski mentioned you need to get a copy on DVD for yourself. I advise to get a current copy of the CLYMER/I&T FO-4 manual as well -the one here is outdated.

    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:


    Tim Daley(MI)

    Steve Dabrowski    Posted 09-10-2020 at 17:57:57 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Transmission disassembly
  • Unless you have some badly worn gears, the main transmission issue will be the bearings and their preload which is adjusted by removing (or adding) shims to the rear bearing caps. removing the main and counter shafts with gears is relatively easy and assessing the condition of the bearings easily done by looking at them. Bearing preload on re assembly is checked with an inch-lb torque wrench.

    There is a manual on the transmission in the manuals section of this board which you can print out as a .pdf. It shows in detail the tools and procedures, but unless the tractor has been badly mistreated there is unlikely to be broken gears or a need to actually remove gears from the shafts. On mine I just took the main and counter shafts with gears and bearings and soaked them in four gallons of Simple Green for a couple of days, washed them off and used WD40 to keep any rust away. On reassembly I had to remove a couple of shims to get the preload right.

    Also pulling the pinion gear can be a job, you need to use some threaded rod and a plate across the flange face of the differential housing to draw it out, but unless some teeth are gone or a bearing is clearly bad you should not need to remove it. You will probably need to renew the left differential bearing because it has a greater load on it ( the ones I've taken apart needed that replaced). Getting the old one off is best done by cutting through it with a Dremel metal cutting grinding blade. Putting a new one one is done by heating it a bit with a propane torch. The race in the axle housing knocks out easily and putting the new one in ice for a bit makes it easy to install.

    Good luck, but none is hard just have to think a bit and have patience. It is always good to sleep on it sometimes.

    Steve Dabrowski    Posted 09-10-2020 at 18:04:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Transmission disassembly
  • The Transmission Assembly Overhaul - Dealer Mechanic Training [PDF]- is in the device and maintenance section of the manuals area, not under transmissions.

    al    Posted 09-09-2020 at 08:19:44 [URL] [DELETE]        [Reply] [Email]  
  • Re: Transmission disassembly
  • Barry,I have a Sherman over-under I took out of a NAA several years ago rebuilt it with new seals and bearings, if you are interested email at ndiver1c@yahoo.com
    Al
    I am in central Texas

    Tim Daley(MI)    Posted 09-09-2020 at 06:57:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Transmission disassembly
  • Get some help on John Smith's archived site -see LINK. Scroll down to "Restorations". I'd advise to take block, head, and crankshaft to a reliable machine shop who knows these old Ford Tractors. Have block and head boiled and tested (Magna-Fluxed) for cracks. The head can be dusted if needed. The block can be rebored if needed and the crank reground. The guy will know what kit, pistons and bearings, to get. Gears can be very expensive.

    Tim Daley(MI)

    Kirk-NJ    Posted 09-09-2020 at 03:02:52 [URL] [DELETE]        [Reply] [Email]  
  • Re: Transmission disassembly
  • I've done several in the past because of broken teeth and growling bearings and it ain't that hard as long as you have a press or access to one. Have a Jubilee trans tore down now. While everything is open consider putting in a sherman combo. Good luck with your project.

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