Replace Tecumseh HMSK105-159908C - Snowblower Forum : Snow Blower Forums
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post #1 of 29 Old 07-23-2014, 08:08 PM Thread Starter
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Replace Tecumseh HMSK105-159908C

Hi all,
Brand new and looking for help.
I have (had) Yard Machine by MTD 10Hp/26" electric start blower
(engine really 10.5Hp i.e. HMSK105-159908C) and I grabbed the wrong
oil (SAE30 and not 5W30) and put it in my blower. The result was a hole
in the side of my engine (see picture and my log in name Dohh! Man!)
So the question is what to do? Cant find the 10.5Hp engine but there are some new HMSK100 around but pricey. Used ones come up once and awhile but not too plentiful so I was thinking (always dangerous) could I replace with a short block.


. This depends on everything on my engine can fit on this. Would value your suggestions and any ideas. My head hurts every time I try and match up part numbers with engines.

Thanks
Dohh-man
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post #2 of 29 Old 07-23-2014, 08:20 PM
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As long as your flywheel fits you could probably use the shortblock. That will be a lot of if work though.

As for the oil types, I don't think the thicker oil would make a huge difference unless it was really cold in your area. Was it typically below 32 degrees and was your blower stored in an unheated space? Might not have been anything you did so don't beat yourself up over it.

As for replacement engines, you might be able to get away with one of the 212cc Predator $99 engines from Harbor Freight. Most people use them for up to 24" blowers, but a few people have stuck them on 26" blowers and say it works fine as long as you don't push things too hard. They are only rated for around 6.5 - 7HP, but they do have a lot of torque compared to the older flatheads.

The first thing to do is look at your old engine. Some of them had 2 shafts coming out the front and some only had one. Most new engines that you buy are only 1 shaft, so if your old one was a 2 shaft engine it will be a lot more work switching it over.

Please direct all snow blower questions to the forums and not to me with PMs.

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post #3 of 29 Old 07-23-2014, 09:25 PM Thread Starter
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Replace Tecumseh HMSK105-159908C

Thanks for the reply Shryp,

This happen during a snow storm and dropped two feet of snow. I had cleaned off a small part of my driveway when it blew up. This was late in the season so the only "cheap" snow blower I could find was a small Honda which I paid almost the same amount for the MTD.

I read several post on replacement with the 212cc Predator but they were 5.5Hp engines. My owners manual is for 8-12 Hp engines and I remember something about the block size changes between 7 and 8. I have 3 sets of pulleys on my engine but only one shaft (see picture)
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post #4 of 29 Old 07-23-2014, 10:17 PM
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Hi Dohh-man
Welcome to the forum. Sorry to hear about your 10.5 Tecumseh. I seriously doubt the cause was your choice of oil. The 10 class have a rep for throwing rods. I would not go the short block route unless you are fond of the challenge. I would look for a suitable replacement engine on Craigs, or for a used replacement blower. Summer prices should land you a decent running machine for 100 bucks or so. MH

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post #5 of 29 Old 07-23-2014, 10:41 PM
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You have 2 shafts on your engine. I can see them right there. The larger shaft has 2 belts for the auger and the smaller shaft has 1 belt for the wheels. Unfortunately an engine swap is going to bit a bit of trouble for you.

I swapped an HM80 for a 212 Predator and it fit right on.

Your other option besides finding a 2 shaft engine would be to find a single shaft Tecumseh of the same type and switch the front cover and cam shaft from your old engine onto the new engine.

I agree with motorhead and think your time and money might be better spent looking for a different blower all together. MTD is known as a lower quality and cheaper built machine so you a bit of money you might get a blower that works a bit better for you.

Please direct all snow blower questions to the forums and not to me with PMs.
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post #6 of 29 Old 07-23-2014, 10:59 PM
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It can be done if you can handle doing a bit of modification to your machine. I swapped a 2 shaft 5hp Tecumseh out for a single shaft Predator engine and yes it was a bit of work. I flipped the gear and the pick up wheel to the otherside and got a larger diameter friction plate to slow down the machine as well since the cam shaft runs at half the speed of the crank shaft. It was a fair amount of work unlike my repowered Gilson made Montgomery Ward with a single shaft Briggs 8hp which I just put the 212cc engine on and blew snow. As to hp I have a HF Predator 212cc on a 26 inch width Montgomery Ward (Gilson) 8/26 and it can handle it very well. The new OHV engines make more power per cc than the old flat heads engines and can usually handle up to a 26 inch width. Like Shyrp said I would not go at a real high rate of speed in the deep snow but my Predator easily out powered the poor running Briggs 8hp flat head. I would buy the 301cc HF Predator for $249 if you want to have a more robust machine. Or put a 420cc on and it would be a beast
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post #7 of 29 Old 07-24-2014, 03:27 PM
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ALOHA to the forms. good luck with that project..:cool :

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #8 of 29 Old 07-24-2014, 05:32 PM
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hello dohh-man, welcome to SBF!! if it were me I would get a good used machine and put the mtd aside until I found a motor ( new or used ) for it

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post #9 of 29 Old 07-26-2014, 09:37 PM Thread Starter
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Thanks everyone for your ideas and suggestions.
Yes I do have 2 shafts on my engine (wish full thinking on my part for only one)
Since I have just enough skill with repairing these things to get into trouble, I think I will have to wait until an exact match becomes available. Thanks again, you help me not purchase something which would not have worked for me without a major career change.
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post #10 of 29 Old 08-10-2014, 04:47 PM Thread Starter
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I'm baaack...

OK doing some thinking on my golden thrown an found this item on ebay. (spend way too much time on the thrown and ebay)




Which is a B&S 7.5 hp engine with two shafts. I have not measured my old shafts yet but know the B&S main shaft is different from my Tecumseh. Kind of hoping to get away with a "drop in and go" Anyone played with this type of engine swap. Would this be a "newer" style of engine with more power compared to the old one (i.e. old flat heads engines vs Predator engine ) Thanks again for your help.

Dohh-man
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