Toro 724 - 38050 - Blown Connecting Rod - Snowblower Forum : Snow Blower Forums
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post #1 of 63 Old 01-01-2016, 03:59 PM Thread Starter
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Toro 724 - 38050 - Blown Connecting Rod

Today I picked up this 30+ year old Toro

Model: Toro 724 - 38050 Ser 9000953
Engine: Tecumseh H70-130176D Ser 81320
Connecting Rod: Tecumseh 32591C eBay: $18

Photos:https://goo.gl/photos/pUg518MMahSJteiQ9

As you can see, the case is cracked where the electric starter used to be.
The previous owner salvaged the starter for his other Toro. He was running it last week when it suddenly started blowing smoke and seized.

I have zero hands-on experience with 4 stroke engines but have watched lots of videos lately. My best guess is that the connecting rod shattered.

If that's true, a generic replacement is about $18 shipped on eBay.

Question: can JB Weld be used to fix the crack in the crankcase cover. I am hoping it should be fairly low pressure and reasonable temperature in there and that all it needs to do is seal well enough to keep the oil in place... does that sound about right? I've seen videos of people doing that and posted one below.

Any opinions would be welcome.

Links for reference:
Engine:
https://www.jackssmallengines.com/Ja...eh/26253/88454

Snowblower:
Toro 38050 Parts List and Diagram - (1000001-1999999)(1981) : eReplacementParts.com

Connecting Rod:
Rod Connecting Tecumseh Rotary 6769 Prime Line 7 03864 Sunbelt SB 6769 | eBay

Links to DonyBoy73 repair videos:

JB Weld Crankcase:

Last edited by unknown1; 01-03-2016 at 02:53 AM. Reason: shared photo link got corrupted
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post #2 of 63 Old 01-01-2016, 04:35 PM
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I don't know if trying to patch up the hole in the block is a good idea. I would get a new engine. or used off E-BAY. try this site www.brandnewengines.com

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #3 of 63 Old 01-01-2016, 04:39 PM
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It might work, or you can go to Harbor Freight and get a 212cc engine for $99. Remember, if the rod got seized and broke, other things are probably going bad in that engine too.

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post #4 of 63 Old 01-01-2016, 04:58 PM
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I put a Harbor Freight Predator 212 on a Toro 724 this week. In my opinion the engine swap could not have been simpler. I had to buy four longer bolts for the tractor to engine attachment. On mine, the output shaft was the exact same size and location. Pulley swapped directly over and used existing belts. I did have to buy a new bolt to attach the old pulley to the Predator shaft because it was a different width.
Seriously Eeezee Peezee.

Oh, I also spent some extra time extending the more convenient Toro key switch wires so you didn't have to use the engine mounted kill switch to turn it off.

Modifying the crank handle location due to interference with the Honda clone valve cover however took a bit of creative fabrication.

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post #5 of 63 Old 01-01-2016, 05:19 PM Thread Starter
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Quote:
Originally Posted by Shryp View Post
It might work, or you can go to Harbor Freight and get a 212cc engine for $99. Remember, if the rod got seized and broke, other things are probably going bad in that engine too.
Thanks for the pragmatic and realistic answer.
I guess you mean these Predators (presumably Honda clone)..

Gas Engines – Save on Replacement Engines at Harbor Freight

Looks like they've gone up $20 to $119
Or were you thinking of a different engine perhaps?
If so.. can you add a link please.

The Snow engines from brandnewengines seem quite a bit more expensive.
Briggs & Stratton Snow Engines


I need to go find and watch videos and do some research. I'm sure there are good repower threads and videos explaining how to do this for a newbie like myself.
Hopefully it's a straight swap with matching bolt holes and shafts etc.
Who knows... maybe 4 bolts and a couple of pulleys and you're done.

Having said that, one day I *DO* want to play with fixing up an engine.. just for the learning experience and the satisfaction of spilling oil all over the place. ;-) Maybe I should do both.
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post #6 of 63 Old 01-01-2016, 05:25 PM Thread Starter
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Quote:
Originally Posted by dbert View Post
I put a Harbor Freight Predator 212 on a Toro 724 this week. In my opinion the engine swap could not have been simpler. I had to buy four longer bolts for the tractor to engine attachment. On mine, the output shaft was the exact same size and location. Pulley swapped directly over and used existing belts. I did have to buy a new bolt to attach the old pulley to the Predator shaft because it was a different width.
Seriously Eeezee Peezee.

Oh, I also spent some extra time extending the more convenient Toro key switch wires so you didn't have to use the engine mounted kill switch to turn it off.

Modifying the crank handle location due to interference with the Honda clone valve cover however took a bit of creative fabrication.
This came in while I was typing message #5
So it sounds like it's so easy even I can do it.

Good idea to avoid that kill switch on the engine. I've been whining about them over on the MTD thread.
Get some cheese and crackers and enjoy the whine.
https://www.snowblowerforum.com/forum...p-honda-c.html

When you say modifying the crank handle, what did you do?
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post #7 of 63 Old 01-01-2016, 05:36 PM
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Yea, those Predators are the engines I was speaking of. The 212cc is often on sale or has coupons for $99. The 'normal' sale price is around $120-$130.

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post #8 of 63 Old 01-01-2016, 05:58 PM
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Quote:
Originally Posted by stuart80112 View Post

Good idea to avoid that kill switch on the engine. I've been whining about them over on the MTD thread.
I soldered the Toro kill switch into the Chonda circuit so that you could use either, but the handlebar version is much more convenient.
Quote:
Originally Posted by stuart80112 View Post

When you say modifying the crank handle, what did you do?
The Chondas cylinder and head angle off the the left and occupy space that was available on the L-head engine. The shaft for chute rotation passes thru this once clear space. It truly is one of the more common snags with a Predator swap depending on how the OEM chute rotation was setup. I should post a pic, but basically a modification of the bracket to clear the engine is what I did.

Quote:
Originally Posted by Shryp View Post
Yea, those Predators are the engines I was speaking of. The 212cc is often on sale or has coupons for $99. The 'normal' sale price is around $120-$130.
They seem to be more strict about following the fine print in the coupons excluding the Predators. The do go on sale for $99 3 or 4 times a year.
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post #9 of 63 Old 01-01-2016, 08:56 PM
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on my toro 824, i did not have to modify the chute crank. i did have to put new belts on because the crankshaft sits lower and get a sleeve for the pulley but thats it, otherwise it was a direct swap
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post #10 of 63 Old 01-01-2016, 09:15 PM Thread Starter
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I went to the nearest Harbor Freight looking at the Predator 212. They were "on sale" for $120.
I decided to sign up for their spam and discount coupons. I'm in no real hurry so I think I will wait for the next $99 special.

Here are a few photos and a 360 degree video for your armchair shopping pleasure.

https://goo.gl/photos/47LgmsR3WPnfcj3G6

Shopping Predator link:
6.5 HP (212cc) OHV Horizontal Shaft Gas Engine EPA

Last edited by unknown1; 01-03-2016 at 02:55 AM. Reason: shared photo link got corrupted
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