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Tune-Up Specifications - Allis-Chalmers

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
WC,WD,WD-45,WF .020 .030 FLY TDC 1-2-4-3 .010H .010H For intake & exhaust valve clearance, WD-45 set at .012H
U,UC .013 .035 FLY TDC 1-2-4-3 .010H .010H  
H-3 .020 .025 FLY TDC 1-2-4-3 .010H .016H  
G .020 .025 FP NOTCH 1-3-4-2 .010H .010H  
D-19 .022 .025 FP TDC 1-5-3-6-2-4 .015H .020H  
D-10,D-12,D-17 .022 .025 FLY TDC 1-2-4-3 .013H .013H Spark plug gap for LPG is .020. Int. & Exh Valve clearance for Ser. No. D-10 (3501) D-12 (3001) & Up is .009H and .015H
C,CA .020 .030 FLY TDC 1-2-4-3 .010H .012H  
B,IB,RC .020 .035 FLY TDC 1-2-4-3 .010H .010H  
A .020 .032 FLY TDC 1-3-4-2 .012H .012H Point gap is for Fairbanks. Set Splitdorf .012-.015
D-14,D-15 .022 .025 FLY LINE 1-2-4-3 .009H .015H Point gap is for D-15 only, set D-14 at .020. For spark, LPG set center. For Int. & Exh. Valve clearance, D-14 set at .013H

Legend
  • 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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