Toro 421, Predator engine swap? - Snowblower Forum : Snow Blower Forums
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post #1 of 21 Old 10-14-2015, 08:49 AM Thread Starter
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Toro 421, Predator engine swap?

I am considering a Harbor freight Predator engine for my Toro 421, which threw a rod through the block last winter.
With a coupon that can be had pretty cheap. I have seen a few Tecumsehs on CL, but the price of a new Harbor Freight engine is pretty tempting.
Anything I should know before I do this?
Thanks.
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post #2 of 21 Old 10-14-2015, 09:14 AM
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not really, its pretty much a direct swap at least on a toro 521. the only thing you will have to change is is the bolt for the belt guide and the engine crankshaft bolt
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post #3 of 21 Old 10-14-2015, 11:16 AM
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You will also need to change the arrangement for the chute crank. The new engine will be a bit wider.


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post #4 of 21 Old 10-14-2015, 01:32 PM
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whoops left that out
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post #5 of 21 Old 10-14-2015, 03:21 PM
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Watch the linkage carefully when you use it. It tends to get gummed up with the snow you're blowing and it can freeze up on you.

A few members have made a shroud/cover to keep crap out of the throttle and governor linkages.

Toro Powerlite 38172
Toro 418 38282
Toro 521 38052
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post #6 of 21 Old 10-14-2015, 05:14 PM
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this is how i extended my crank arm, i used one long bolt, one nut and two locknuts. very simple and it allows you to reuse the existing holes and bracket
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post #7 of 21 Old 10-14-2015, 06:49 PM Thread Starter
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Looks good. What size is the crank bolt for the predator?
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post #8 of 21 Old 10-14-2015, 09:43 PM
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crank bolt is a 5/16-24(aka 5/16 fine thread) and the bolts surrounding the crankshaft are the same
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post #9 of 21 Old 10-14-2015, 11:41 PM
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i was also able to reuse the existing kill switch, simply cut off the existing plug where they connected to the old engine, extend the wires, and follow the pics for the rest. both switches will function normallyToro 421, Predator engine swap?-20150913_163733_resized.jpgToro 421, Predator engine swap?-20150913_163739_resized.jpgToro 421, Predator engine swap?-20150913_163759_resized.jpg
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post #10 of 21 Old 10-15-2015, 10:05 PM Thread Starter
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Looks good! I'll be doing mine some time soon. Hope I won't need it as much this year as last.
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