Posted by RegularJo on September 09, 2010 at 13:19:57 from (24.158.60.32):
I�m having issues starting my �28 McCormick Deering 10-20 when hot. The tractor can be difficult to start when cold also, but it�s almost impossible to restart when hot. I initially suspected coil or condenser trouble, but I�ve checked spark on all plugs when hot and receive a nice, fat, blue spark at each plug. I�ve actually had two magnetos on the tractor and have experienced the same problem with each one. Originally I had an F4 mag but replaced it with a rebuilt E4A for originality purposes. I set the timing with number one piston just a hair past TDC to prevent kickback as I do on all my other hand cranked tractors.
I�m now wondering about the valve clearances since I�m having the most difficulty when hot. The valve clearances are set at 0.011 hot per the owner�s manual. To me, this value seems a lot lower than the clearances I�ve seen in other IH engines. What valve clearances are some of you running in your 10-20�s?
Any other suggestions as to what else may be causing the hard starting issue are welcome. Thanks in advance for any help!
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