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MF-12 Old School Repower (OH140 Tecumseh)


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#1 FirefyterEmt OFFLINE  

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Posted October 09, 2017 - 10:36 AM

So my old 12hp motor in my Massey Ferguson finally gave up after 45 years. It has been smoking oil for the last few years and it just wouldn't run properly anymore. Carb rebuilds did nothing and it wouldn't even idle anymore. I decided it was time to swap in my overhead valve 14hp Tecumseh which I have kept sitting around for years. :D
My biggest problem with this motor is that the carburetor was junk. (and a dead SSI of course) For some reason, Tecumseh carburetors sell between $200 to $300 on eBay. I decided to take a chance and bought a $20 carburetor for a 14hp Kohler. (K341) amazingly the carburetor bolted up without modification, even the governor linkage connected without modification after drilling the hole slightly bigger in the throttle plate. I still have to hook up a choke linkage and I had to fabricate a plate to modify the air cleaner to fit the Kohler carburetor. This Tecumseh has an air cleaner fed by a tube from the blower cover at the flywheel. Down the road, I plan to use that air cleaner but need to pull the front of the tractor back off.

I plan to fabricate a new muffler to work with my original "Deluxe Muffler" with the chrome shield. The exhaust exits further back towards the dash, so the original muffler will not work. However, It appears that I can make it work with a custom build. For now, the original one will work.

If anyone has a photo of the choke cable set up for a Kohler, it would help. I think I have to cut the finger tab off the choke plate so the cable can connect to it, and I think I can run under the carb and go straight up to hook it up, but photos always help! I will also clean it up and spray a fresh coat of paint on it once all the details are worked out... but primer, for now, will get her running!

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Edited by FirefyterEmt, October 09, 2017 - 12:28 PM.

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#2 FirefyterEmt OFFLINE  

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Posted October 09, 2017 - 11:12 AM

I don't think I ever put photos up to show the external alternator....  The alternator is a "one wire" design, so once the rpm comes up a bit it will start to charge.  It's a "mini race alternator" from eBay and is rated for 40 amps.  I had a lot of fitting for the brackets which are all handmade, but the hardest part was the pulley stack.   I had to sacrifice a spare pulley and machine off the outboard pulley, turn a tenon to mate with the pulley stack, and drill and tap to bolt it on.  This inboard area is where the hydro-lift would run, which gave me the idea to run it in this area. Its a very tight fit and even touches the grille sightly. I need to find a little smaller belt but may need to switch to a link belt to get the exact length I need.

 

Anyway, it works awesome!  oddly enough, the old 12hp motor would really bog when the alternator "came on" but the 14hp does not even notice it. I have to assume the old 12hp was just THAT tired and worn!

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Edited by FirefyterEmt, October 09, 2017 - 11:20 AM.

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#3 tractorskipper OFFLINE  

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Posted October 09, 2017 - 08:17 PM

Nice setup on the alternator.  So how are you going to deal with the dead SSI?

 

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#4 FirefyterEmt OFFLINE  

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Posted October 09, 2017 - 10:01 PM

That was dealt with years ago. I am running one of Ed Stollers modified coil's and the ignition module from a 70's era Dodge with an external coil. I have a write up in the stickys... It's going on 7 years without an issue.
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#5 jimmy G OFFLINE  

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Posted October 10, 2017 - 02:02 PM

Ford,gravely and IH

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