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Tractorholic
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890 Posts
Discussion Starter · #1 ·
Can someone please tell me what size the crank shaft is where the pulleys slide on for a g14 tech motor. Is it 1", or 1 1/4"? Thanks for the help!
 

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if i can remember ill measure the one on my parts machine tomorrow after work
 

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Fixer of Broken junk
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Should be 1 1/8".

I'll let ya know for sure in a couple minutes.I have a 1556 sitting up behind the shed with the pulley off.OH150 15hp ohv Tecumseh.Crank and pulley should be identical.

Edit:

Just measured the crank and pulley with my calipers and they are 1 1/8" on the Hydro 1556.Not sure if the gear drive G14 crank is smaller but I checked the crank and pulley on a gear drive 1253 HH120 and it is also 1 1/8".
 

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Tractorholic
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Discussion Starter · #5 ·
Anyone know if the tech motors are all the same crank shaft size? Like if I wanted a 16 or 18hp tech motor swapped in for the 14hp.
 

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Tractorholic
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Discussion Starter · #7 ·
Ok, thanks guys! Looking into possibly swapping a motor into my g14. The tractor will just be a work horse so I'd like to get a higher hp engine for snowblowing and tilling duties. A good member here is trying to help me out with a motor. Hopefully it all works out!
 

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Jack of all trades, master of none.
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1,133 Posts
Tecumseh oh140 crank size is 1 1/8"
 

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Tractorholic
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Discussion Starter · #9 ·
Thanks guys for the help, but I have another question for everyone. The 16 and 18 hp tech. motors that are available to buy are 1" crank shafts. If my 14hp is 1 1/8" is there a bushing that can be bought to adapt the pulley to 1"??
 

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You should be able to get a split sleeve bushing to make up the difference. On another note, the newer OHH series engines have a thicker oil pan due to having counter balance gears. Without going through all the specs, it may prove quite difficult to get things lined up if the overall dimensions are not the same as the engine you're replacing. If you have the model and spec # from your old engine and the prospective replacement, I'll gladly check into it to see if it's feasible.
 

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Tractorholic
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Discussion Starter · #11 ·
I'm looking to swap out my stock oh140 with a similar year 16 or 18 hp tech single cylinder. I guess the engine mounts are the same, the engine assembly isn't bigger, just the crank shaft is different size.
 
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