Repowering Toro 3521 w/ 179cc Engine - Snowblower Forum : Snow Blower Forums
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post #1 of 29 Old 12-05-2017, 08:21 AM Thread Starter
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Repowering Toro 3521 w/ 179cc Engine

I have my original 179cc (5.5 HP) engine from my Troy-Bilt 2410 sitting, waiting for a machine to run.

I came across this Toro 3521, needing a new engine. Figuring that the original 3.5 hp engine is a bit light for a 21" machine, I planned to put the 179cc engine in its place

the 3521 is basically the same machine as it's big brother, the 521. Here is the 3521 alongside my re-powered 521.

Repowering Toro 3521 w/ 179cc Engine-img_0618.jpg

The 179cc is a decent fit

Repowering Toro 3521 w/ 179cc Engine-img_0620.jpg

Both my 521 and this 'new' 3521 need an impeller bearing. So, I did some 'minor' disassembly . . .

Repowering Toro 3521 w/ 179cc Engine-img_0623.jpg

I figure, while the machine is apart, I'll give it a quick coat of paint to stiff it up a bit.

Then I could either sell it this winter as a capable small/agile machine or keep it as another spare

Regards, Ted
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Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #2 of 29 Old 12-05-2017, 08:25 AM
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Lookin' good Ted! You're going to need a "5"521 label now.

What are you going to do with the Tec side-popper?


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post #3 of 29 Old 12-05-2017, 08:56 AM Thread Starter
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Originally Posted by classiccat View Post
Lookin' good Ted! You're going to need a "5"521 label now.

What are you going to do with the Tec side-popper?
You mean the old 3.5 Tecumseh? not sure . . . I'll see if I can get it to run, then maybe sell on CL. I'll want to do a compression test and leak-down test on it to see how 'good' it is.

I suppose I could re-brand the 3521 as a 5521

Regards, Ted
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Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #4 of 29 Old 12-05-2017, 10:16 AM
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lookin good. I'm thinking a more powerful "5521" could be very useful.
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post #5 of 29 Old 12-05-2017, 07:18 PM
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Looks good! My new to me 3521 got a similar freshening up, but with the ubiquitous Predator 212.

If you find a dead later 521, the taller chute is almost a bolt on for the 3521, with only minor changes necessary at the base.

1971 Ariens 922002 (sold)
198x Toro 3521 with Predator 212 and tall chute
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post #6 of 29 Old 12-05-2017, 07:34 PM Thread Starter
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Originally Posted by sciphi View Post
Looks good! My new to me 3521 got a similar freshening up, but with the ubiquitous Predator 212.

If you find a dead later 521, the taller chute is almost a bolt on for the 3521, with only minor changes necessary at the base.
Yes, my 521 has the Predator. I did notice the smaller chute, but I'll see how it works first with the standard chute. I have seen the taller chutes from 521's on eBay $20-$50 range.

Regards, Ted
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Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #7 of 29 Old 12-05-2017, 08:18 PM
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the smaller chute lows just as far lengthwise but struggles when it comes to throwing over snowbanks
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post #8 of 29 Old 12-06-2017, 05:57 AM
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the short chute does not throw as far as the tall chute, my 2450 was throwing snow farther than my 521 when it had the short chute on it. if you are keeping the 3521 put the tall chute on it but if you are selling it leave it as is, it won't make a difference of what someone will pay for it and it won't be a selling point

current machines
1-toro2450E-38419. 1-toro3000E-38435. 1-toro 3650E-38445
2-toro 521E-38052. 1-toro xl824pt 38086
1-.............,TORO XL 624ps..............
1-............, TORO XL 824ps..............
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post #9 of 29 Old 12-06-2017, 08:48 AM Thread Starter
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If I were going to keep this machine, I'd get the taller chute. As it stands, I'll probably sell the machine and use the cash to buy an 824 in need of some TLC.

Regards, Ted
.
Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #10 of 29 Old 12-10-2017, 06:27 AM Thread Starter
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I have the impeller bearing (bushing) ready to be installed, but . . .

Since I had the machine apart, I took care of the rust and put a fresh coat of paint on everything.

Repowering Toro 3521 w/ 179cc Engine-img_0634.jpg

I masked areas off to save the decals

Repowering Toro 3521 w/ 179cc Engine-img_0635.jpg

I used my $9 HVLP sprayer that I got recently from Harbor Freight and mixed my own Toro Red, since the local stores did not seem to have the Apple Red.

Next steps are to put it all back together and fit the 'new' engine on it. I will have to make some pulley modifications as the Troy-Bilt engine has a 7/8" diameter shaft, and the Toro pully is a 3/4" diameter. So, my plan is to use the pulley assembly that came with the Troy-Bilt, but the positioning is a bit off. So, I'll have to do some modification of the Troy-Bilt pulley set.

Regards, Ted
.
Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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