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Tune-Up Specifications - Ford

This data has been gathered from old out-of-print material. While we make every effort to be accurate, the information shown is to be used for general reference only. It is always best to have the original service or operator's manual for your tractor before attempting any tuneup.

There is a legend at the bottom of the page describing some of the terms used here.

Model Point Gap Spark Plug Gap Timing Mark On Spark Occurs Firing Order Int. Valve Clearance Exh. Valve Clearance Comments
501,601,701 (Gas & LP) .025 .027 FLY 4 deg BTDC 1-2-4-3 .015H .015H For spark, LP set a 7 deg.
600,700 (Gas & LP) .025 .027 FLY 8 deg BTDC 1-2-4-3 .015H .015H For spark, LP set at 11 deg. For spark plug gap, LPG set at .030
800,900 (Gas & LP) .025 .027 FLY 5 deg BTDC 1-2-4-3 .015H .015H For spark, LPG set at 8 deg. For spark plug gap, LPG set at .030
801,901,1801,2030 (Gas & LP) .025 .027 FLY 4 deg BTDC 1-2-4-3 .015H .015H for spark, LPG set at 7 deg. For spark plug gap, LPG set at .030
NAA,NAB .025 .027 FLY 8 deg BTDC 1-2-4-3 .015H .015H  
2N,8N,9N .015 .025 None TDC 1-2-4-3 .010-.012C .014-.016C  
4030, 4040 .025 .027 FLY 4 deg BTDC 1-2-4-3 .015H .015H  
6000 (Gas) .030 .025 FP 4 deg BTDC 1-5-3-6-2-4 .015H .015H  
2000,3000 (Gas) .025 .025 FLY 3 deg BTDC 1/2/03 .015H .018H  
4000 (Gas) .025 .025 FLY 3 deg BTDC 1/2/03 .015H .018H  
5000,7000 (Gas) .025 .025 FLY 2 deg BTDC 1-3-4-2 .015H .018H For all Fords listed here and above, set timing at 475 RPM

  • TDC - Top Dead Center
  • FP - Crankshaft Fan Drive Pulley
  • Exh - Exhaust
  • Int - Intake
  • ATDC - After Top Dead Center
  • BTDC - Before Top Dead Center
Data collected from an old Niehoff tune-up chart.

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