1995 Ariens ST724 and an Old Iron Guy - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 03-21-2017, 11:10 PM Thread Starter
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1995 Ariens ST724 and an Old Iron Guy

A friend from work stopped by my office asking if I’d be interested in his father-in-law’s Ariens snowblower that crapped out during the last storm.

It already had a one-way ticket to the scrap yard!

The decision was easy … aided by the fact that my wife is out of town for a few days on business

It’s a 1995 Ariens ST724.

He grabbed the machine last night and we transferred it to my truck over lunch this afternoon.

1st Impressions.
The Good:
  • It’s tiny…and light!
  • Tractor/auger are 7/10…just need some touch-ups.
  • Handle-bar/controls are intuitive 6/10 …surface rust and missing bolts.
  • This might be a keeper for the Mrs!
















continued...


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post #2 of 20 Old 03-21-2017, 11:20 PM Thread Starter
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The Bad:
  • Plastic wheel rims. The wheels are very wobbly.
  • PO has a weight mounted on the underside of the auger housing...that weight didn't do those whimpy plastic wheels any favors.
  • Skids are hosed & the scraper was taken literally right to the edge of the auger housing.
  • Shots of the obligatory belly-pan mouse house...yum!

Ariens gurus...please tell me that these can be replaced with steel rims!




traction assembly looks good... plastic drive gear??



^^ if I had to repower with a single output shaft, it looks fairly simple to reverse the direction (cams spin backwards). The main obstacle is speed. The Cam spins 1/2 of the crank speed. There's not enough room in this tiny chassis to fit a much larger traction pulley.


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post #3 of 20 Old 03-21-2017, 11:26 PM Thread Starter
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The Ugly (aka,The Engine):
  • Camshaft / secondary PTO is seized.
  • Cracked the sump at the extended PTO output.
  • Connecting rod snapped right at the piston...smacked the piston skirt and scored the cylinder.
  • Block-end cam bearing is cracked --> That's the deal breaker right there. Time for a "new" engine.

The oil level is good.

I'm fairly certain that this engine was over-revved causing the valve springs to float; there was a healthy amount of fresh oil spray right at the breather tube.

The PO did have it to a service shop prior to the last storm because he didn’t like the way it sounded... If I were him, I'd let them know that the engine grenaded.

cracked sump:


toasted cam shaft:


the cam lobe smashed the lifter and became lodged ...i suspect valve spring float from overrevving

^^^ exhaust valve was also slightly bent

snapped connecting rod, damaged piston skirt and slight cylinder scoring from the dinged piston:

^^^ cracked the block behind the starter as well...



the cracked cam "bearing":


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post #4 of 20 Old 03-21-2017, 11:36 PM Thread Starter
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Net: the easiest repower would be to find another 7hp tecumseh... even easier if it's dual output

I would love to put one of those 305cc briggs on there but the single PTO would be a major PITA.

The chute control would need some modification if the height of the engine is changed...since it's the over-the-top design.


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post #5 of 20 Old 03-21-2017, 11:37 PM
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Great post-mortum. You certainly know engines.
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post #6 of 20 Old 03-21-2017, 11:38 PM
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Didn't see til after the post. You are my "neighbor". I live in Rotterdam. Great to have a local engine expert.
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post #7 of 20 Old 03-21-2017, 11:47 PM Thread Starter
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Quote:
Originally Posted by RIT333 View Post
Didn't see til after the post. You are my "neighbor". I live in Rotterdam. Great to have a local engine expert.
Give me a holler anytime you need a hand!


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post #8 of 20 Old 03-22-2017, 09:09 AM
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Looks like a harbor freight engine is in store for that 1 you could make a few bucks flipping that also. besides I thought the wifey was in love with ALICE????

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #9 of 20 Old 03-22-2017, 09:11 AM
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I Bet the GOV went south on it to make it over rev.

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #10 of 20 Old 03-22-2017, 02:27 PM Thread Starter
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Quote:
Originally Posted by POWERSHIFT93 View Post
Looks like a harbor freight engine is in store for that 1 you could make a few bucks flipping that also. besides I thought the wifey was in love with ALICE????
I found another dual output 7hp.

The traction assembly is designed for 1/2 of the RPMs that are generated by a crankshaft PTO...and the chassis is too cramped already to fit a larger friction pulley. If there's a will, there's a way I suppose...I don't need anymore projects!

The Mrs. won't go near Alice for some reason. She (Alice) does look rather menacing... maybe when I clean her (Alice) up, my wife will quit giving Alice the cold shoulder!

Quote:
Originally Posted by POWERSHIFT93 View Post
I Bet the GOV went south on it to make it over rev.
That would be my guess!


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