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No spark on tecumseh 4 hp lawnmower engine - Sport & Outdoor - Others

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  • Karla Pitts May 28, 2010

    have no spark on our tecumseh lawnmower engine

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Dear Acelady,
Check all the grounding point for corrosion.
The flywheel needs to be remove with a flywheel puller. There are (should be) 3 holes in the center of the flywheel. Tap the holes with a 1/4 inch 20 national course tap. You can use the Tecumseh puller, recommended, or use another puller that fits the flywheel hole pattern.

When you re-install the flywheel, make sure you squeeze the engine shut-off lever or you will damage the flywheel brake.

As for the coil, disconnect the small wire(s) connected to the coil...it should be a push on type spade connector. Remove the spark plug and re-install the starter. Check for spark. If you have spark then the coil is fine and you either have a bad wire or a stretched engine shut-off cable. I rarely find bad coils; it is either the cable or wire. As for a sheared key, you will normally have spark.


1- Check the Flywheel Key. If the Key is Damaged it Will Cause this Problem. The Flywheel Key Times the Engine. 2- Check the Coil Clearance from the Flywheel. It should be .020in. 3- Check the Spark Plug Gap. Should be ,035in. 4- Check the Valve Lash on the Exhaust Valve. Should be .017in Clearance Between the Valve Stem and the Valve tappet. 5- Check for a Burnt Valve(the valve must be removed from the engine block to perform this check). Hope this Helps.

Posted on May 28, 2010

  • Karla Pitts May 28, 2010

    we have checked all of the suggestions you gave still no spark any more suggestions

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Hi,

There is a shutdown wire, this wire is grounded somewhere along the route. Look at the coil for this wire; it shorts the coil to ground so no spark can get out to the plug.
Let us know if you want to know something else accept the suggestion.
Thanks for contacting fixya.com

Posted on May 28, 2010

  • Karla Pitts May 28, 2010

    we tried this and still no spark

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