Replacing Tecumseh H70 on a Snapper I 722 - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 09-26-2017, 07:37 AM Thread Starter
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Replacing Tecumseh H70 on a Snapper I 722

What replacement engine do you recommend? I like the Snapper and would rather replace the engine than buy a new machine.

I would prefer to get an engine that spins in the same direction, but I would not rule out another option if it seems to be a better overall choice.
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post #2 of 19 Old 09-26-2017, 09:39 AM
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They all spin the same direction for the most part, only issue would be if your engine has one or two pulleys

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post #3 of 19 Old 09-26-2017, 10:07 AM
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Quote:
Originally Posted by Dauntae View Post
They all spin the same direction for the most part, only issue would be if your engine has one or two pulleys

True. Things you might have to consider is the length and diameter of the replacement engine shaft, bolt holes and interference with other things on the blower. An example of interference is some machines if a Tec is replaced with a OHV clone, it interferes with the chute controls so they have to be reworked.


Easiest solution typically is find another Tec 7-10 HP unit as many are a direct swap out. Cheap solution might be find a parts machine with a good engine on it. HF clone has been used by a lot of people successfully on various brands of blowers. Know though many (if not all) clones are constant speed engines unless you find a kit to add a throttle.


My thoughts.
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post #4 of 19 Old 09-26-2017, 10:31 AM
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Tecumseh 5-6-7 is considered a "Small Block" and mounts Differently than the 8-10. 5-6-7 will fit without mods if the crank diameter matches. Agree with Dauntae, Good Chance it's a Double shaft Engine, Fairly common on the MTD type 5-22's See Post #8 in this thread for photo of Footprint of 7tec vs 8tec Post the Model Number of the Machine in Question.
https://www.snowblowerforum.com/forum...s-repower.html

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post #5 of 19 Old 09-26-2017, 02:07 PM
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Brand new Predator 212cc is $99 with coupon.

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post #6 of 19 Old 09-26-2017, 08:54 PM Thread Starter
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Thanks, for the posts. It is a double shaft engine.

The model number is H70130279P.

Shryp mentioned the Predator 212. I had been looking at that one, but my understanding is that it spins in the opposite direction as the Tecumseh. Therefore, the forward speeds are slower and the reverse speeds are too fast. On that model of the Snapper you can't address the problem by merely reversing the drive assembly wheel. Reversing that piece puts the slot too low for the steering rod to engage properly.

I'm aware of the shaft issue; it seems rather easy to fix.

I have been leaning toward getting the Predator. However, I like the idea of dropping in another Tec engine, if I can locate one. It might eliminate some of the extra work.

Thanks for all of the replies. Any further suggestions or ideas would be appreciated.
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post #7 of 19 Old 09-26-2017, 08:54 PM
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Quote:
Originally Posted by Jackmels View Post
Tecumseh 5-6-7 is considered a "Small Block" and mounts Differently than the 8-10. 5-6-7 will fit without mods if the crank diameter matches. Agree with Dauntae, Good Chance it's a Double shaft Engine, Fairly common on the MTD type 5-22's See Post #8 in this thread for photo of Footprint of 7tec vs 8tec Post the Model Number of the Machine in Question.
https://www.snowblowerforum.com/forum...s-repower.html

That's interesting. I have the top plate from a parts blower that originally had a 7 HP on it. In the photo I have a 10 HP from another one and it bolted right down to it with no mods. No idea why as I'd always assumed all 7-10 HP have the same footprint. Worst case, knock the bolts out and drill it for new bolts.


If it turned out to be a twin shaft, I think parts from a single shaft engine and a twin shaft can be swapped if you take the crank cover and cam out. I've got a blown 8 hp in the shed I picked up just for the parts though I have yet to find a need to swap them out.
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Last edited by HCBPH; 09-26-2017 at 09:29 PM.
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post #8 of 19 Old 09-26-2017, 11:55 PM
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the holes must have been predrilled from the factory then. the sump cover is larger on the hm80 and up and interferes with idler pulleys and belt covers on almost all blowers if the factory mounting holes are used
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post #9 of 19 Old 09-26-2017, 11:58 PM
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I have some Cams and Case Covers Stashed as well. Fairly Straightforward to swap.
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post #10 of 19 Old 09-27-2017, 05:49 AM
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You can swap the cam and sump cover on those. I successfully did took a 6 HP twin shaft with a seized cam bearing and put the cam/cover from a 7 HP with a messed up crankshaft. In my case it converted a twin shaft into a single shaft, but same thing.

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