Question for the Pulley Pro's - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 06-08-2018, 08:56 PM Thread Starter
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Question Question for the Pulley Pro's

Greetings one and all.

It's June; so it's time to drag out the Snowblower's and get them tuned and ready.

One project I'm working on is a Toro 521 that I am looking to do a motor swap on. Usually, I read in posts, folks have to get an adapter to increase the thickness of the new motors shaft to match the old pulleys, I need to go in the other direction: The shaft for the motor I would like to use is thicker than the original Tecumseh motor, so I need to get some pulleys to fit.

The Tecumseh 5hp has a shaft that looks to be about 3/4" and the the Chinese motor I have has what appears to be 7/8's shaft.

The replacement motor is a 208cc from a Troy-Bilt single stage blower, made around 2008, it say's MTD on a label but I don't know who made it for them.

Can anyone hold my hand, be gentile, and point me towards the kind of pulleys I would need? Does Tractor Supply carry anything along the lines of what I would need? Other than shaft size what else should I look at, to keep it close to stock as possible.

Thanks in advance

K
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post #2 of 19 Old 06-08-2018, 10:21 PM
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post #3 of 19 Old 06-08-2018, 10:54 PM
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you may want to double check your measurements. if that 208cc is anything like the 1 i plan on putting on my snowblower it should have a 1" output shaft. tractor supply should have pulleys. you could also look for someone parting out a snowblower with 8+hp engine on it. the 8hp and larger generally have a 1" output shaft also.

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post #4 of 19 Old 06-08-2018, 11:54 PM Thread Starter
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Quote:
Originally Posted by dbert View Post
Sometimes it's easier to adapt the new shaft to the original pulley.
https://www.amazon.com/Engine-pulley.../dp/B01N2U41D9
I'm not sure how this would work for me. If I am understanding you correctly, you are suggesting using this adapter to increase the thickness of the shaft to accept the pulley, the problem I have though is that the opening in the pulley is too small for the new shaft, not the other way around.

Thanks though.

K
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post #5 of 19 Old 06-08-2018, 11:58 PM Thread Starter
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Quote:
Originally Posted by crazzywolfie View Post
you may want to double check your measurements. if that 208cc is anything like the 1 i plan on putting on my snowblower it should have a 1" output shaft. tractor supply should have pulleys. you could also look for someone parting out a snowblower with 8+hp engine on it. the 8hp and larger generally have a 1" output shaft also.
I will look into that. My measurement was taken by closing an adjustable wrench on the shaft(s) and then measuring the gap. I expected 1" but it appeared to be only 7/8. Thinking about it now, I believe I may also have a pulley from a 8hp Tecumseh somewhere. If that does fit it sure would be sweet.

Thanks for the tips.

K
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post #6 of 19 Old 06-09-2018, 11:05 AM
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7/8" is just an oddball size that i think you only see on smaller lawnmowers engines. the bigger lawnmowers usually run a 1" output shaft

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post #7 of 19 Old 06-09-2018, 11:16 AM Thread Starter
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Quote:
Originally Posted by crazzywolfie View Post
7/8" is just an oddball size that i think you only see on smaller lawnmowers engines. the bigger lawnmowers usually run a 1" output shaft
I double checked this morning and it does appear to be a 7/8 shaft. I did the crescent wrench deal again, this time including the 8hp Tec motor I have as well, and the shaft on the 8hp motor is thicker than this 208cc I am trying to use.

I'm hunting now for pulley's, the original seems to be about 2 1/2 OD, and, if worse comes to worst, if I cant find a pulley for a 7/8 shaft I will look for one for a 1" shaft and use a sleeve to adapt the shaft to the new pulley(s).

K
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post #8 of 19 Old 06-09-2018, 11:23 AM
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you might be able to reuse the 1 pulley on the new engine. it looks like there is a spacer between the 2 half's.

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post #9 of 19 Old 06-09-2018, 07:30 PM
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Seems MTD likes to use 7/8 shafts on the the Troy Bilt line as I have a 179cc from a Troy Bilt and it IS a 7/8 shaft. Another member here had done exactly what you are and I am pretty sure he got one from Tractor supply.

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post #10 of 19 Old 06-10-2018, 10:30 AM
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What do you have for a key or keyway that keeps the pulley from spinning on the shaft ?
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