Anonymous-0
Well-known Member
i just bought a 1938 farmall f12. serial number on tractor and engine match but engine has ha5 next to it. anyone know what that means?
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Anonymous-0
Well-known Member
thanks for all of the comments and info. the serial number reads - FS123852 - on both engine and tag on tank support. the engine also has ha5 after it so it reads - FS123852 HA5. previous owner told me it has a gear put in it that makes top speed go to 3 mph. maybe HA = high altitude and 5 = change in final drive gear. what do you think? by the way, this is one of the last f12's made before production stopped. about 90 from the last one made.
Anonymous-0
Well-known Member
thanks a lot "36F30." i took your information about the high altitude and removed the spark plugs and rolled engine over to check. all 4 cylinders have the stepped pistons. 3/4 of piston head on left side has got a flat raised step of about 0.25" inch high and the last 1/4 of piston head on the right side is lower. definitely matches the "HA5" as high altitude with having the higher compression pistons to match.
the f12 doesn't run yet as needs an ignition tune-up, but do i have to do anything with the timing on the F4 magneto cause of the high compression pistons? keep the timing adjustment lever on the retard side?
by the way i learned quite a bit and many thanks for your help.
the f12 doesn't run yet as needs an ignition tune-up, but do i have to do anything with the timing on the F4 magneto cause of the high compression pistons? keep the timing adjustment lever on the retard side?
by the way i learned quite a bit and many thanks for your help.
Timing and starting procedure is exactly the same, she's just got more pop at lower altitude. Follow the timing and starting procedure by the book or she will kick the snot outta you. Many F series got high dome pistons during overhauls. I don't find many with original flat tops. Cool thing about yours is it's supposed to have em. High altitude narrow tread (HAN) F20/30's are very desirable. They didn't need to make a narrow F12 because of the axle set up. Good find.
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