N Board Forum - Expanded Thread Page

Subject: Engine rebuild with out splitting the tractor

[Back] [Return to Top of Forum]

Peter    Posted 05-24-2019 at 21:55:50 [URL] [DELETE]        [Reply] [Email]  
  • Engine rebuild with out splitting the tractor
  • Hi, I would like to replace my cylinder liners, pistons, all gaskets, crank journals and valves. I have a 39 9N and noticed on just8ns that there is an engine kit for 480 dollars. Would this be possible to do with out splitting the tractor. thanks in advance. I am leaking coolant in my oil and getting some blow out of my crank breather. Looks like the engine could use some TLC as it smokes a bit. Got the tractor a while ago but never used it. Oil pressure is good and carb and distributor/wire and plugs are new. Exhaust manifold gasket is good. Transmission and brakes are fine.

    TheOldHokie    Posted 05-25-2019 at 10:59:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • It is called an in frame overhaul. On an L-head you can replace pistons, liners, valves and rod bearings without splitting the tractor. Main bearings can be replaced but you will find it is a PITA and better done by splitting the tractor. Valve seats can be resurfaced IF you have access to a portable seat grinder. You will not be able to resurface the crankshaft journals which may or may not be an issue for you. IMO, unless you have a real problem that really needs to be fixed you would be better off using the tractor until such time as it needs a more thorough overhaul.

    TOH

    Tim Daley(MI)    Posted 05-25-2019 at 06:32:15 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • Do the job right the first time -no shortcuts; they always come back to bite you later anyway. DO NOT BUY ANY PARTS until you get the engine torn down. Then you'll know what size pistons and bearings to buy. Once torn down a good machine shop will need to boil the block. they will remove liners, if there are any, and check cylinder bore sizes. They will also check for cracks and any other defects. If you never did a rebuild before, I suggest you leave it to a good shop. They will check the block, check the head, turn the crank and purchase the correct kit for you. the original N engines had steel cylinder sleeves until early 1950. Then they were cast iron. Unless you know the history of the tractor, who knows what, if any, sleeves are in it now. The steel sleeves are a moot point anyway as they don't make them anymore. You can only get cast iron liners. Steel was a poor choice to begin with and Ford knew that. Why else would they mark the s/n with a star symbol to designate it as such. What is the tractor serial number? You do know that all 9N and 2N models, 39- 47 had the serial number prefix of 9N; there is no such thing as a 2N stamped s/n? If indeed a '39, is it an aluminum hood model? Are you restoring it? 6V or 12V? Can you post pictures? Where are you located? A word of advice: A decent rebuild will cost $1500 - $2500 using an experienced shop/mechanic.

    Tim Daley(MI)

    Ultradog MN    Posted 05-25-2019 at 03:17:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • I have done inframe overhauls but the big question before you start us: how is your oil pressure?
    Without a split you cant do anything with the crank and on an N, the oil pump.
    Also, with a flathead, unless you know someone you can bring the whole tractor to - or they will come to your place - you can't do much with the valves except lap them.

    Farmer Dan    Posted 05-25-2019 at 10:55:52 [URL] [DELETE]        [Reply] [Email]  
  • Re: Engine rebuild with out splitting the tractor
  • You can throw them away and install the adjustable 8N valves. Easy job.

    Dean    Posted 05-25-2019 at 11:17:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • Yes, but how does that restore the seats?

    Dean

    Farmer Dan    Posted 05-25-2019 at 19:21:12 [URL] [DELETE]        [Reply] [Email]  
  • Re: Engine rebuild with out splitting the tractor
  • Lapping the valves is part of the process. If the seats are in bad shape it may take a while, just get another beer and keep going. Or pay a machine shop to do it.

    http://www.ntractorclub.com/howtos/pdfs/9N-Valve-Job.pdf

    Dean    Posted 05-26-2019 at 09:38:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • That's the problem with flat heads.

    Few (no?) machine shops will travel to ones farm to grind seats with a portable seat grinder these days. This means that one must beg borrow or steal a portable seat grinder (done this in years past) or remove the block to take it to a machine shop.

    Une can lap valves by hand but one cannot restore seats by lapping.

    Dean

    Ultradog MN    Posted 05-25-2019 at 16:40:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • Yes.

    Den N Ms    Posted 05-25-2019 at 21:49:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine rebuild with out splitting the tractor
  • Dan,If you call that 4th picture a valve seat grinding job and valve job but not me.
    It looks like those valves are worn beyond refacing and need to be tossed.
    Also the seats need to be narrowed up as they are way to wide or replaced and new seats cut or ground.

    [Back] [Return to Top of Forum]


    Top