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Larry Chamberlain

Replacing 8hp with 12hp

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Larry Chamberlain

I'm trying to stuff a 12 Kohler under the hood of my 8 go 4 speed wheel horse but running into some issues I'm sure someone in here has done this please chime in thanks 

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oldredrider

It would help if you described the issues......

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Larry Chamberlain

sorry mounting the oil pan I need to be all but touching the battery tray but I can't drill the front holes cause if the steering mount for the tie rods

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kudzu3

What tractor do you have?

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Larry Chamberlain

8hp 4 speed it's a 73

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kudzu3

Do you know the model of the tractor. I'm thinking the 12 should hook right up, but I'm certainly not an expert.

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Larry Chamberlain

Aolt of cleaned issues yes it hooks right up I had to notch the lower corner of the hood so I clears the oil pan ear now the issue with the air cleaner I'm just gonna have to notch the side I bought a gt14 air cleaner neck so I can mount out the side but gotta take a good chunk out the side of the hood 

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kudzu3

Sounds like you may have it figured out Larry, how about some pictures :)

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Larry Chamberlain

1471809665309751054599.jpg

14718096865651606012160.jpg

14718097036371880876445.jpg

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kudzu3

Wow, that is tight! Surely someone here has done this, I'd sure like to see how it was done.

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19richie66

Couldn't you have mounted the motor further back and move the battery to the front? Not next to a tractor at the moment. Just a thought.

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skrusins

Has the frame be altered ? There are a lot of holes drilled in the side from what I see. It's not standard.

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kudzu3

I searched 1973 wheel horse tractor images and looking at the 8 hp, there's just not enough room in there for a 12. The 8 hp engine sets forward, almost against the hood grill. Looking at the pictures, the frame seems to be stock, the holes are there. I think that tractor just wasn't made to for a bigger engine without a lot of alteration. Keep us posted Larry, interesting project.

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Larry Chamberlain

I got the hood all notched out did I dry fit up of the clutch and belt everything seems to be good gotta send the block to machine shop with the piston to get bored 10 over 

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kudzu3

Glad to hear things are fitting, May be a good idea to check the crank too, I had one re built a few years ago and when I got it all together and cranked it up, it had a slight knock. Had to take it all down and have the crank turned :bitch:.   :wwp:

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