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Garden Tractors Discussion Forum

Tecumsah HM 100 12V starter failure

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Bob - MI

04-09-2018 06:22:31

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Last fall I decided to upgrade my generator to electric start. This is an older Generac 6500 unit with a 10hp Tecumseh single cylinder engine that is REALLY difficult to start with the rope.

So I got a toothed flywheel, made a battery tray and mounted up a solenoid and a switch to a 12V starter that I got on Ebay brand new.

After starting this generator roughly 10 times it won't turn over anymore. Yesterday I traced it down to the starter which was shorted out. Upon disassembly I discovered the magnets in the casing had split and were stuck to the armature. These looked to be powdered metal with almost not effective bonding within the layering.

My search has uncovered that this seems to be a somewhat common problem with these and I'm wondering if I should just try to fix this problem with small brass bolts through the casing or is there a better starter out there?

Everywhere I look these are about the same price, 30 day warranty made in Taiwan.

Any suggestions? Thanks in advance.

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Russ from MN

04-09-2018 11:34:26

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 Re: Tecumsah HM 100 12V starter failure in reply to Bob - MI, 04-09-2018 06:22:31  
I wonder if the starter got too hot and caused the glue to fail? Did the engine start immediately or did you have to crank it awhile? Another thought is did this engine ever have a decompression feature and is it still working?

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Bob - MI

04-09-2018 14:53:21

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 Re: Tecumsah HM 100 12V starter failure in reply to Russ from MN, 04-09-2018 11:34:26  
Engine starts quickly so I would doubt that it got too hot.

Turns out that I got this from a company that has a 1yr warranty so I sent them a note today asking how they want to address this.

This engine doesn't have a compression release which is the primary reason I upgraded to the electric start.

It was kind of a fun project overall and being able to start it with the push of a button is very rewarding. When it works of course...

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04-09-2018 07:29:57

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 Re: Tecumsah HM 100 12V starter failure in reply to Bob - MI, 04-09-2018 06:22:31  
Clean the powder and chips and old glue off of the larger pieces and the area they were glued to and stick 'em back in place with epoxy.

Lots of us have done that successfully.

If they've fallen off completely, hopefully there's impressions left in the glue that give a clue as to what goes where, or you'll have a starter that doesn't work or turns backwards.

(The magnets are ceramic and I doubt very much it's possible to drill or tap them.)

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