Blown Engine Causes - Snowblower Forum : Snow Blower Forums
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post #1 of 22 Old 12-08-2019, 12:10 AM Thread Starter
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Blown Engine Causes

Start of the season here in Ontario

I have bought many snowblowers with Tecumseh engines with broken connecting rods.

Question is what’s the major cause ?

My 3 bets are over reving , low oil or hitting something hard at full engine speed.

What are your thoughts ?

Ariens 924334 11 hp 28
Ariens 924024 8 hp 32 now a 10 hp
Ariens 910008 7 hp 24

Last edited by Ian Ariens 924; 12-08-2019 at 12:18 AM.
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post #2 of 22 Old 12-08-2019, 12:16 AM
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Wear and age . . . they aren't exactly young any more. The factors you list certainly can't have helped either.
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post #3 of 22 Old 12-08-2019, 12:41 AM
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Most of what you listed is a cause, and Tecumseh was noted for connecting rod failure due to weak rods from manufacture, they were just not built strong enough for normal use in the first place. Mini bike usage where a lot of times the engines were over-revved and lubrication sloshing around caused very many failures on their engines, but they were not expensive to replace back in the 70's.
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post #4 of 22 Old 12-08-2019, 01:21 AM
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i would say over revving from a sticky throttle or low oil would likely be the biggest reasons for them to blow up. i know i have dealt with quite a few machines where the throttle for some reason sticks. you can free it up and lube it but it eventually does it again. i know it was part of why i sold off my old snowblower. every year i had to free up the throttle again.

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post #5 of 22 Old 12-08-2019, 01:57 AM
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C.W.
Yes the throttle and governor weren't the greatest back then.
I forgot to mention, there were a lot of aftermarket companies that made heavy duty connecting rods back in the 70's and 80's for them and they were not expensive, but put the rod in first before you blew it up.
Mini-bike and go-kart usage and failures were common back in the day, but those little Tecumseh's were a lot of fun for them back then, and easy to over-rev. If you blew one up, you went down to the local hardware store and got another one, and away you went, till you blew that one up. At least they were cheap to buy new back then.
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post #6 of 22 Old 12-08-2019, 10:45 AM
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Over revving. It's recommended to run at 3,600 rpm. I run at 3,450. But it may not mean much.

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post #7 of 22 Old 12-08-2019, 10:57 AM
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Not over revving I've run MANY they all have been run from 3750 to 3825 with no issues
clean full oil is they key I run them 1/16 over full checked and maintain before every use 45 yrs of doing this
lost 1 engine as gov took a crap and reved to 6k pop


1 useless stoopid owner low oil no oil
2 wear age
3 useless owner never change oil


over revving is a bs myth
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post #8 of 22 Old 12-08-2019, 11:02 AM
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Quote:
Originally Posted by ST1100A View Post
Most of what you listed is a cause, and Tecumseh was noted for connecting rod failure due to weak rods from manufacture, they were just not built strong enough for normal use in the first place. Mini bike usage where a lot of times the engines were over-revved and lubrication sloshing around caused very many failures on their engines, but they were not expensive to replace back in the 70's.

Weak rods what a joke

they are 40 yrs old and still running most abused by stoopid owners
this how bs myths keep going you typed it therefore it must be true
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post #9 of 22 Old 12-08-2019, 11:21 AM
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I have to go with 1132 on this topic.

Owner Neglect plain and simple .. wrong oil (LOL, like 30W), bad oil or no oil at all. I suppose if someone neglected it to the point of no limit on the governor, well, surely the outcome would be catastrophic.

I never heard of Tecumseh noted for bad rods, and I have many from waaaayyyy back they run great to this day, and of course, properly maintained, and that includes currently running the 5W30 Full Synthetic in all my equipment, new and old, summer and winter.
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post #10 of 22 Old 12-08-2019, 12:17 PM
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have received 2 blown Honda engines in last 3 years. no or little oil in crank.
Honda dealer told me they get at least one blown engine a month. low or no oil is the cause.

these machines don't have much of an oil capacity in the first place. 1.16 quarts in the bigger machines and 0.63 to 0.79 quarts in the smaller ones. no much room for error.

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