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-   -   1872 - Kohler 28 EFI repower (https://www.onlycubcadets.net/forum/showthread.php?t=33102)

cyr2872 07-07-2014 10:40 PM

1872 - Kohler 28 EFI repower
 
I'm finally getting around to posting my 1872 repower. Things are far from over but today was the first day I was able to drive it around on the new engine. But lets start from the beginning:

A couple years ago I got the Cub bug when I acquired a IH 782. I loved that thing and had no intention of selling it until I happened upon 1872. The 1872 had a blown motor I initially wanted it for the power steering, dual brakes, and dual hydraulics to put on the 782. I wasn't too fond of the KT17 series I that was in my 782 and realized that what I really wanted to do was repower the 1872 with a modern engine, preferably EFI.
I picked up the 1872 and sold my 782 to a gentleman that was retiring and looking for a tractor to restore and play with, so I new it was going to a good home which made it easier.
On to the good stuff:Started tearing her down.
http://i1356.photobucket.com/albums/...psd5413e79.jpg

http://i1356.photobucket.com/albums/...psd2478a6d.jpg

http://i1356.photobucket.com/albums/...psd2fb088a.jpg

http://i1356.photobucket.com/albums/...ps39a44a12.jpg

http://i1356.photobucket.com/albums/...ps6dcbe450.jpg

cyr2872 07-07-2014 10:42 PM

http://i1356.photobucket.com/albums/...ps94916772.jpg
Down to the frame:
http://i1356.photobucket.com/albums/...psc9207d86.jpg
http://i1356.photobucket.com/albums/...ps30ac41c9.jpg
All cleaned up and ready for a little paint
http://i1356.photobucket.com/albums/...psd9f19365.jpg

cyr2872 07-07-2014 10:46 PM

I picked up a cast rear end. I loved having the extra weight that my 782 had for plowing.
http://i1356.photobucket.com/albums/...ps03daa9f8.jpg
http://i1356.photobucket.com/albums/...ps8672347c.jpg
I used the internals from the 1872 (used some threads on here to help me through the swap.) New axle tube bearings/seals, and pinion bearings.
http://i1356.photobucket.com/albums/...psc7f02f53.jpg

cyr2872 07-07-2014 10:53 PM

Frame all painted. Time to mount the front axle and tower.
http://i1356.photobucket.com/albums/...ps4dca18e9.jpg
http://i1356.photobucket.com/albums/...ps3bee5a86.jpg
Engine arrived! Fits pretty nicely just need to figure out how far back I can place it.
http://i1356.photobucket.com/albums/...ps8782a1c5.jpg

ACecil 07-07-2014 10:56 PM

Great pics of your build! Please keep the pics and updates coming.

cyr2872 07-07-2014 10:58 PM

For the fuel set up I was able to use the factory outlet and mounted the fuel pump down low. I mounted the regulator up off the fuel tank bracket and ran the supply to the other side of the engine. The return was plumbed back into the tank using a bulkhead fitting from Summit. ECU mounted as well and figuring out the wiring.
http://i1356.photobucket.com/albums/...ps0823f37b.jpg
Fuel pump relay, fuses, and wiring all mounted.
http://i1356.photobucket.com/albums/...psfbfce2b6.jpg
Test fit of the throttle cable. At first I used one from the local auto parts store...it was crap. Went to TSC and found one that works perfect.
http://i1356.photobucket.com/albums/...ps69408b34.jpg

cyr2872 07-07-2014 11:11 PM

For the drive shaft I picked up a engine coupler off a 2185 and a driveshaft off a 3185. I got the splined adapter for the pump from Surplus Center for a great price. I welded the adapters together marked where I needed to drill the hole for the roll pin since that is what the 1872 pump used. Turned out very well.
http://i1356.photobucket.com/albums/...ps05597883.jpg
http://i1356.photobucket.com/albums/...ps0569b09b.jpg

The pto was a bit tricky mounting. I had to use a few washers behind the coil plate to get the right placement. I made a spacer to go on the shaft to space the magnetic portion away from the coil. And since the shaft on the new engine was a bit longer, I needed to make another spacer for the bolt. Also, don't forget the diode!!
http://i1356.photobucket.com/albums/...ps073952e9.jpg
http://i1356.photobucket.com/albums/...ps1c93ac0c.jpg
http://i1356.photobucket.com/albums/...ps31a68006.jpg

0.017...perfect.

cyr2872 07-07-2014 11:13 PM

And finally, today is the day for the first test drive. I love the EFI start and the way it sounds. Hopefully I'll love the gas savings too. That KT17 loved the stuff.
http://i1356.photobucket.com/albums/...ps3f31b045.jpg
http://i1356.photobucket.com/albums/...ps25287236.jpg
http://i1356.photobucket.com/albums/...ps0c5991bd.jpg

cyr2872 07-07-2014 11:26 PM

I have more pictures floating around here somewhere. I'll post them tomorrow.

On the to do list still:
1) finish exhaust piping through the side and heat shield.
2) possibly cut a hole in the side panel to allow heat to escape from oil cooler properly.
3) adjust/rebuild brakes
4) wire lights to separate switch
5) mount the mower deck and mow some grass!


Possible issues:
After a bit of driving around I shut it down to check for leaks. I heard a gurgling coming from under the seat and found one of the check valves (right on in the picture) all wet. Do I just need new O-rings or a whole new valve?
http://i1356.photobucket.com/albums/...psb81f2dc6.jpg

The other was I heard a slight howl coming from the rear. I only really heard it while the was maxing out the hydro speed. I'm used to the bevel gear sound from my 782 so it sounded abnormal to me. I guess my question is to those who have used both the bevel gear rear and the straight cut rear gears, if there is a noticeable difference in rear noise? It wasn't enough for me to think anything is wrong, everything was within spec, it's just...different.

Cubcrazy 07-08-2014 06:14 AM

Nice job on the repower! That engine is a beast!


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