Installed new motor and have a few questions - Snowblower Forum : Snow Blower Forums
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post #1 of 25 Old 02-10-2018, 06:18 PM Thread Starter
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Installed new motor and have a few questions

Hey guys,

I am brand new to the forum and recently purchased an old toro 3521. The original Tecumseh was in rough shape so I swapped it with a Predator 212cc from Harbor Freight.

Unfortunately, my belts are very tight now. I used 3/8 x 29 belts for both the Auger and drive. I now realize the correct size it 29 for the drive and 29.5 for the Auger. So by my findings the drive belt should be the correct length but it is so tight, the pulley is on an upward angle, touching the side of the housing.

I feel like both belts need to be longer. What am I doing wrong here? The engine shaft is in the same location as the old motor.

Thanks!
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post #2 of 25 Old 02-10-2018, 07:01 PM
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One of our members just did that swap...hopefully he'll chime in with the answer.....I've been looking at my 421 with a swap in mind.......
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post #3 of 25 Old 02-10-2018, 08:12 PM Thread Starter
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Thanks, the motor itself runs great for a Chinese knockoff. Fired up the second pull with ease
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post #4 of 25 Old 02-10-2018, 09:24 PM
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Welcome to the forum!

If these same belts were OK with the old engine, and you're using the same pulleys, then I can only assume the new engine's crankshaft is not actually at the same position as the old engine. Or it's at the same height, but shifted left/right, thereby still requiring longer belts.

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post #5 of 25 Old 02-11-2018, 10:49 AM Thread Starter
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Thanks red, that does seem logical but the after measuring the crankshaft seems to be in the same location. I must be going crazy.

I think I will just get longer belts and see how it performs. Is there a preferred method to measuring for this? Assuming I am moving away from the stock sizes?
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post #6 of 25 Old 02-11-2018, 10:59 AM Thread Starter
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After a bit of research, it seems string or an oversized belt is the way to go for measuring. I will try this and get back to you guys.
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post #7 of 25 Old 02-11-2018, 11:01 AM Thread Starter
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In the meantime, if anyone knows how to contact the member that successfully completed this swap, I would very much like to pick his brain.
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post #8 of 25 Old 02-11-2018, 11:39 AM
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Quote:
Originally Posted by boybadone View Post
In the meantime, if anyone knows how to contact the member that successfully completed this swap, I would very much like to pick his brain.

================================================== ====
Looks like a member called scihi may be able to help you. He posted about adding a tall chute to his 3521. He also said that he had put a 212 predator on it. ---- John
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post #9 of 25 Old 02-11-2018, 11:48 AM
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Check out V belts for less. They will give good info on how to measure and they will likely have what you need. Is the auger belt cogged?

Also another difference may be in your tensioner pulley location. When I did a Preditor swap I had to make a new longer mounting bracket for the tractor drive tensioner pulley to get it to work better and still fit under the belt cover.

If all you have to do a get a bit longer belt that may be your best option.

https://www.vbelts4less.com/message.asp?msg=49

Good Luck.

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Yard Machine 22" upgraded with 6.5 HP Predator
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post #10 of 25 Old 02-11-2018, 01:39 PM
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If the crankshaft is 1/4" higher it doubles the difference in belt length to 1/2" which is a big difference.

You need to buy longer. It may be a guessing game, trial and error, to see what is perfect.

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