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The time to get the Cubs out has finally arrived!!!  Our 122 has a very special story and is very important to our family and as such is going to be the next in line for a little tlc.  We plan on pulling the engine and tear it down to get measured up and get a rebuild started.  I would love to do a David Kirk style project but I'm not sure if the parts are even out there let alone for a standard rebuild.  What have you seen out there these days?    

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A buddy of mine and I did Dave Kirk style Killer Kohler rebuilds on 14 HP Kohler's for Cub Cadets. Mine's more "stock", buddy's was  much more radical, forged aftermarket piston, Midwest SuperCub forged bullet con-rod, his cam was way more radical too.  He put it in his #73 Red & White Cub Cadet which he took to several plow days, and it was a great running tractor and a Stunner on looks.  He's sold the tractor now, think it's in Southern Iowa.  My 14 hp had a stock +.010 piston & rings, the Alcoa Forged rod Dave Kirk describes in his Killer Kohler write-ups, I ported the block, and used a K361 Kohler cam, slightly longer duration but stock lift. Head was planed a bit.  I put a small diameter flywheel, backplate,, and blower housing on the engine so I could fit the 14 hp in my stock #72 frame. I had Dave Kirk install a set of his balance plates on my stock crankshaft. That 14 hp has just slightly less vibration than my stock 10 hp Kohler had. But it pulls like a locomotive!

  All that went on almost 20 years ago, finding a Alcoa rod would probably be the hardest, but I suspect Midwest SuperCub still has their billet rod available. I was shocked how expensive stock Kohler parts were back then, and I suspect they've had 4-5 price increases since.  I've used some Stens parts in a couple rebuilds in the past with excellent results. Con-rod, gaskets, valves, piston&rings.

   My experience has been the bigger Kohler engines run longer between rebuilds. The 7&8hp engines don't last long as mowing tractors. I got over 1400 hours on my rebuilt 10 hp that included LOTS of full load and Over-Loaded hours mowing foot high grass, blowing foot deep snow. A 12 hp drops right in where a 10 hp was, and a 14 hp needs a flywheel swap with a 12 hp.

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4 hours ago, DR.EVIL said:

A buddy of mine and I did Dave Kirk style Killer Kohler rebuilds on 14 HP Kohler's for Cub Cadets. Mine's more "stock", buddy's was  much more radical, forged aftermarket piston, Midwest SuperCub forged bullet con-rod, his cam was way more radical too.  He put it in his #73 Red & White Cub Cadet which he took to several plow days, and it was a great running tractor and a Stunner on looks.  He's sold the tractor now, think it's in Southern Iowa.  My 14 hp had a stock +.010 piston & rings, the Alcoa Forged rod Dave Kirk describes in his Killer Kohler write-ups, I ported the block, and used a K361 Kohler cam, slightly longer duration but stock lift. Head was planed a bit.  I put a small diameter flywheel, backplate,, and blower housing on the engine so I could fit the 14 hp in my stock #72 frame. I had Dave Kirk install a set of his balance plates on my stock crankshaft. That 14 hp has just slightly less vibration than my stock 10 hp Kohler had. But it pulls like a locomotive!

  All that went on almost 20 years ago, finding a Alcoa rod would probably be the hardest, but I suspect Midwest SuperCub still has their billet rod available. I was shocked how expensive stock Kohler parts were back then, and I suspect they've had 4-5 price increases since.  I've used some Stens parts in a couple rebuilds in the past with excellent results. Con-rod, gaskets, valves, piston&rings.

   My experience has been the bigger Kohler engines run longer between rebuilds. The 7&8hp engines don't last long as mowing tractors. I got over 1400 hours on my rebuilt 10 hp that included LOTS of full load and Over-Loaded hours mowing foot high grass, blowing foot deep snow. A 12 hp drops right in where a 10 hp was, and a 14 hp needs a flywheel swap with a 12 hp.

Good point, I had forgotten about MidWest Super Cub.  I'm really interested in the crank balancing and deleting the balance gears.  It's really been a solid motor the whole time we have run it but it's going through a lot of oil.  

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  • 2 weeks later...

Got the engine torn down this weekend.  It was surprising how good the crank journal and con rod looked.  The piston skirts were a little rough looking and possibly the source of the oil blow by but will have to measure to know what's going on. There is zero ridge in this block so I'm leaning towards a possible valve guide issues or the cylinder out of round. I'm also wondering if I should even bother replacing the main bearings.  Here's a look at a few pictures I took this weekend.

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She was due for a cylinder head servicing....that's for sure!!!!!

Are you headed to PD in IL Brian?

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19 minutes ago, Mr. Plow said:

She was due for a cylinder head servicing....that's for sure!!!!!

Are you headed to PD in IL Brian?

That's my plan.  Hoping I can get the 122 back together this month.  Lots of oil burning........

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Block is empty and the components cleaned up.  Guessing it has a Kohler piston but the rod is anyone's guess.  At the minimum  it's looking like valve seats need to be recut, valves ground, piston, rings and possible .10 over bore.  Wrist pin and rod journal looked really good by eye.  Waiting to get some tools to measure the parts up and see what we've got.

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I may be one of the few, but, I've NEVER replaced one of those big BEEFY roller bearing main bearings, Ever! I had a 12 hp Kohler that somehow got about half the blower fins broke off the flywheel, yes, it vibrated terrible! Dad found me a new flywheel and I pulled the engine and replaced the flywheel, Much smoother at all engine speeds. It was crazy the vibration induced failures I had on that engine & tractor. All 4 engine mount holes pulled the threads out of the aluminum oil pan. The steering console where it bolts to the frame started cracking,  I took it off and Dad brazed it up. It was doing well when I last saw it.  I've kinda lost track of some engine parts, but I "Think" the main bearings from that K301 are now in my Hot-Rodded K321. That K321 doesn't have any balance gears in it, but I had Dave Kirk install a pair of his balance plates when I rebuilt the engine.  The K321 vibrates about as much as a K241 10 hp does, that's a smaller bore shorter stroke engine but the K321 is long stroke big bore. I only live about an hour from Dave Kirk, plus I use his favorite automotive machine shop in Fond Du Lac, WI,  I'm sure Dave would install your balance plates for a nominal fee.  I had Brian Miller do a tiny bit of machining on my Alcoa forged Kohler conn rod, and he did a terrible job. I've been a Buyer of machining and machined parts of all kinds for around 30 years, If I could have found another Forged Alcoa rod I would have had a good shop off-set bore the big end to install the Clevite 77 rod bearing.  Baring a catastrophic failure, next rebuild should only need a new main bearing for a common Continental engine.  I've read his entire website, a lot of the stuff he describes is just good housekeeping, keeping things clean.  If I wanted a crazy high performance Kohler engine, I'd have Don Vogt or Julian Stahl, owner of Midwest SuperCub build it.

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From the scoring at the top of your piston is a indicator of your carbs, butterfly shaft and carb housing wore bad, draws unfiltered dirty air in, destroying piston and rings now you have an oil burner.

Carl

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I will say that I have never had this engine apart before so I have no way of speaking to the condition of the parts that went into the engine or the level of attention that may or may not have gone into it. 😉  I have put an exhaust valve and a head gasket on it in years passed to I will pay special attention to the carb when I put it back together.  I plan on putting a balance plate in it and ball honing the cylinder with a stock set of rings and piston.  I also hope to recut the valve seats and have the valves ground if I can find someone to do them. 

This is a thumping little engine and I love it!  It runs out of traction way before it runs out of power for us.  Can't wait to have this back together!

 

 

 

 

 

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8 hours ago, Mr. Plow said:

Connie is +/-18 now right?  Same age as my daughter?   When did we get old?

Yes, she's a senior in high school this year!  Doesn't seem possible.

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Lots of good times along the way and the kids enjoyed it.   Emma is a freshman at Concordia University Mequon this year.....

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10 hours ago, Mr. Plow said:

Lots of good times along the way and the kids enjoyed it.   Emma is a freshman at Concordia University Mequon this year.....

A few from the early days

 

Our oldest Kathleen on the left.  Seems like one of the girls was Art A's daughter but not sure about the other.  

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