No spark on 8HP Tecumseh
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=134743
Printed Date: 27 Apr 2025 at 9:18pm
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Topic: No spark on 8HP Tecumseh
Posted By: Aaron(IN)
Subject: No spark on 8HP Tecumseh
Date Posted: 06 Feb 2017 at 5:30pm
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I have a Tecumseh 8HP engine on and Allis Chalmers snow blower. It ran when I got it. Needed a fuel primer line installed, so finally after a couple years got around to it. Now I have no spark. I took the flywheel off and made sure the magnets were clean. Points look good and gapped to 0.020". I though it might be the condenser, installed a new one, still nothing. I thought it might have a bad on/off switch so bypassed that and nothing. Is there a way to test the coil? Also how do you set the gap between the magnets on the flywheel and the coil?
Any help will be appreciated.
Thanks, Aaron(IN)
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Replies:
Posted By: jaybmiller
Date Posted: 07 Feb 2017 at 6:30am
The gap is an easy on..
put any business card between the flywheel and coil ! It's close enough to get you spark.
disconnect the 'grounding' or 'kill' wire from the points, then spin with plug sitting on the head, you should get a spark.
Try a NEW sparkplug ! I've seen plugs that 'looked' OK but were bad, They get fouled and short themselves out.
Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Posted By: Sugarmaker
Date Posted: 07 Feb 2017 at 7:57am
I have a 8 hp TEC and the shop I go to said these are a little tougher to set. I did get mine reset and have spark and it runs. Cant remember the moves to get it done, cause I am getting old!:) Good luck with the TEC engine. I hate to say but they are not my favorite. The Kohlers are much easier to work on in my opinion.
And yes check that new plug.
Regards,
Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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Posted By: Steve in NJ
Date Posted: 07 Feb 2017 at 9:22am
If it ran fine before, the points probably are oxidized over. A little tv tuner cleaner or Brakekleen will clean off any oxidation on the contacts to give you the spark back...
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Posted By: HudCo
Date Posted: 07 Feb 2017 at 10:34am
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like steve said probley just clean the points or use a points file , pionts gap =.020 coil air gap= .010 to .014 spark plug = .030 i use a long feeler gauge place between the coil and magnets on the flywheel and let the magnets pull the coil down then tighten the screws, roll the flywheel and feeler gauge out
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Posted By: Aaron(IN)
Date Posted: 07 Feb 2017 at 7:09pm
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I did not try a new/different plug. Will try that this weekend as the snow blower is at Dad's shop. It is not the points they looked brand new, but did clean them with fine emery cloth. I re-gapped them to 0.020" after cleaning them and nothing. The coil is mounted on the inside of the flywheel that is why I was asking how to set the gap. All the other small engines I have messed with have had the coil on the out side.
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Posted By: HudCo
Date Posted: 08 Feb 2017 at 7:41pm
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how old is that engine what is the model and spec # ?
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Posted By: Sugarmaker
Date Posted: 09 Feb 2017 at 11:41am
Good luck with the Indian!:)
Regards,
Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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Posted By: jaybmiller
Date Posted: 09 Feb 2017 at 2:54pm
While you're 'turning wrenches', do a compression test. ANything less than 90#s and she's 'weak'....probably will need valves and rings...
Someone sells a 'no-more-points' device for them old engines,about $20, might be worth the investment if you use the machine a lot. Having to pull flywheel off even once a year for 'no spark' is 1 time too many for me nowadays.
Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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