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1925 10-20 McCormick

bumblebee

bumblebee

Well-known Member
This tractor is a yard ornament and was last run about 7 years ago. I would like to adjust the valves. It has one cylinder with very good compression and the other 3 being fairly weak. As most of you know, I determined this by cranking.

Question----What would be the easiest way for me to adjust valves and is the fact that tractor hasn't run for some time something that should be taken into consideration?

Thanks in advance for your help.
 
I believe you should get it running before adjusting valves. my logic is that from sitting it probably has foreign material under valve seats and adjusting the valves might adjust them way tight unless it has had a chance to clear its throat. Make sure it has oil, coolant, spark, and fuel flow to the carb. Follow starting procedures for choke etc. If no results fron hand cranking, Pull start it. If you have never pull started anything, get help from someone that has. Safety is paramount. Jim
 
You could belt it up with another tractor and let it spun over for 15 minutes to blow the rust and junk out and lube the lower end. The valve guides and rockers are oiled manually so do that first. Then adjust them. No different than any other old 4 cylinder. Follow the firing order. But they have weaker valve springs.
 
Rockers and valves on that are lubed by drip from a tray over rocker shaft. Prior to running or cranking you should pour a pint or so of oil in the valve cover to get valve stems lubed. Compression might be low from sticky stems.
 
If it's been sitting that long, before you try starting it, take the valve cover off and make sure the valves aren't stuck to prevent damage
 
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