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I have run across 6 JD valve springs with the p/n of T15939. I can't find out much about them on the internet but it appears that they may have been used in older JD garden tractors that were powered with Tecumseh engines. Can someone out there with a parts manual for one of those 10 or 12 HP JD GT's look up the valve spring part number and verify if indeed these springs are for the Tecumseh engine.

Clutch spring. They are way too big to be a valve spring.
https://avspare.com/spare/deere/T15939/

That sounds reasonable Chuck. Can you confirm that by looking up the part # in an old parts manual?

Dave

Links to John Deere site sometimes work but not always. This search was for a John Deere 1169 - 350B and 350B (Tractor only) Crawler Tractor - 03Nov06. It is the part you have.
http://jdpc.deere.com/jdpc/servlet/...ets.HomePageServlet_Alt?search=model&model=50

The springs I have are p/n T15939. I was just made aware of a master parts lookup index and it says they are for a 350 and 450 crawler, 1010 tractor. I don't know how I came up with the connection to a Tecumseh engine but the mystery appears to have been solved. Thanks to all who responded.

Dave