Model #143920-005 Craftsman transaxle/transmission, tractor

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Adjusting valves on craftsman lt1000


Thank you for your question.


I will be happy to assist you. I looked up the model number of the engine on your tractor. The engine should be model 31C707-0230-E1. If this is the correct model number, the valves should be set to 0.004. I found a great video that shows how to adjust the valves. Click here to watch the video.

I hope this is helpful. Please let me know if you need further assistance.


Thank you for using Manage my life.


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Mark T -
Sears Technician
August 31, 2013

Adjusting valves


Thank you for your question on the adjusting of the valves on the engine.

The .003 to .005 is a little tight but since you changed the cam shaft and timed it correctly that would have also replaced the compression release.

I think I would only lower the piston past top dead center a 1/4 inch in the cylinder not a 1/4 turn before setting the valves at .004 and .006. I understand that this may be splitting hairs but try it to see if it will help.

If you have had this problem for a while the starter windings may be damaged from trying to turn over the engine against the compression.

Please let me know what you find out with the new settings.

Sam A.

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Sam A -
Sears Technician
November 20, 2012