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Subject: Front Main Oil Seal Replacement on '49 8N

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8N Tractor Guy    Posted 01-24-2020 at 20:13:49 [URL] [DELETE]        [Reply] [Email]  
  • Front Main Oil Seal Replacement on '49 8N
  • Got an oil leak, possibly from the front main, but will need to check oil pan bolt tightness first. If I do need to replace the front main crank seal, I plan on using the one piece seal from NAPA.

    For installation of this new seal do I need to drop the oil pan in order to get it properly seated? Or are there any tricks or tips? Been reading threads about the one piece seal installation but most seem to be from folks putting an engine back together after a rebuild.

    Also, how difficult are the timing cover and governor gasket replacements? The governor is definitely leaking oil, won't be sure about the timing cover until I tear into all.

    Bruce Dorsi    Posted 01-26-2020 at 07:46:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: Front Main Oil Seal Replacement on '49 8N
  • It's been a while since I last did a rebuild, but if I remember correctly, the O.D. of the seal fits into the grooves in the timing cover and oil pan.

    To install the 1-piece seal without removing the timing cover, the main bearing caps have to be removed to allow the crankshaft to be lowered enough to install the seal.

    The oil pan needs to be dropped to replace either type of front seal.

    Tim Daley(MI)    Posted 01-25-2020 at 09:13:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Front Main Oil Seal Replacement on '49 8N
  • Hi Guy-
    How bad is the oil leak? Have you checked the weep drain hole with the cotter pin in it to see if you are not seeing some excess oil dripping from it? What is the overall condition of the engine? If it is worn and needs a rebuild, it might behoove you to consider it's time for a total rebuild. You are half way there as far as pulling the engine so you may want to consider it. OEM seals were made of two-piece rope but newer aftermarket ones are now the one-piece design. NAPA, Carpenter, Just8Ns, all carry them. Since you are dropping the pan anyway either way, you might want to consider rebuilding the oil pump too. Now, the best investment tool for every N-Owner is the Essential Manuals. They are every bit as important to have as any wrench. All your questions can be answered in them. The OEM Operator's manual, Service Manual, MPC, and the Clymer/I&T FO-4 Manual are highly recommended if ya wanna be an N-Owner. If you don't already have a set, invest in them and read religiously. Most all of your questions can be found in those manuals and what isn't covered can be found on the NTC forums. Here are some examples of what you can find in the Essential Manuals:



    Tim Daley(MI)

    8N Tractor Guy    Posted 01-25-2020 at 17:31:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: Front Main Oil Seal Replacement on '49 8N
  • Thanks Tim!!

    I have most of the manuals you referenced, either in paper or in electrons. The initial reason for tearing into it was to replace a stinger shaft, shaft drive plate and main crank pulley so my loader can function. Since its still winter this is the season I need it most!

    A few years back I reworked the top end of the engine, with new valves, planed head, and re-honed valve seats. It burns oil in addition to leaking some. I've been intending to rebuild the engine, someday. Looks like someday has arrived. Won't have to worry about swatting mosquitoes doing this job.


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