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GtWtNorth


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Joined: Nov 16, 2008
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Replacing plastic flywheel fans on HM80
Original Message   Dec 18, 2012 5:33 pm
Has anyone any experience with replacing the plastic flywheel fans on the Tecumseh HM80? How are they held on, adhesive?
One of the bolts that holds the blower housing baffle to the block come out, & in short order it took out most of the fan blades.

Thanks

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GtWtNorth


https://t.me/pump_upp

Location: https://t.me/pump_upp
Joined: Nov 16, 2008
Points: 264

Re: Replacing plastic flywheel fans on HM80 flywheel
Reply #1   Dec 19, 2012 4:58 pm
No experience with this! I guess I win the prize for biggest doofus for having let things get to this point.
Anyways, I managed to solve the problem & I'll show you how. After a couple of visits to repair shops I had all kinds of guesses as to how the fan is held in place (none of them correct). One guy had a flywheel with the right fan on it but the flywheel was not for points & condensor like mine. So after searching the internet I came upon someone who was selling just the fan. In his picture, the instruction sheet for installing the fan was spread out beneath the fan & you could just see enough to make out that you had to put the fan in boiling water then slip it over the flywheel.

So I used a heat gun to warm up the broken one to the point where you could tell it was getting a little flexible, pried up the outside edge a bit with a flat blade & it came off with out too much trouble! Hooray! So, I bought the old assembly &  took off the fan with the heat gun. Cleaned it up, put it in boiling water & it slipped on to my flywheel with nary a problem, whew!

Here is a picture of how the  fan is held onto the flywheel with just friction fit. There is a tab on the inside diameter of the fan that slips into a slot machined into the OD of the flywheel. Once the flywheel cools down & shrinks a little & it holds on just fine.



Here's hoping that no one else has to go through this.
Cheers
Paul

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borat


Joined: Nov 10, 2007
Points: 2692

Re: Replacing plastic flywheel fans on HM80
Reply #2   Dec 19, 2012 5:39 pm
Good for you.  We'll have to put that in the "good to know" file.
Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: Replacing plastic flywheel fans on HM80
Reply #3   Dec 19, 2012 8:37 pm
Yeah, what Borat said! And thanks for the good title, it'll help when searching.

Who the hell let all the morning people run things?
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