Antique Tractor Resources - Tune-Up Specifications: Farmall & IH

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

Super M, MV, H, HV .020 .025 FP 1st Notch 1-3-4-2 .017H .017H

M, MV, H, HV .013 .025 FP 1st Notch 1-3-4-2 .017H .017H

Super A, AV, C .020 .025 FLY DC 1-4 1-3-4-2 .014H .014H

A, AV, B, BN, C .020 .025 FLY DC 1-4 1-3-4-2 .014H .014H For IHC magneto set points to .013, Wico magneto set to .015

154 Lo-Boy, Cub Lo-Boy, Farmall Cub .020 .023 FP TDC 1-3-4-2 .013C .013C For IHC magneto set points to .013, Wico magneto set to .015 - Int & Exh valve clearance for 154 Lo-Boy set to .015

Cub Cadet, 70 & 100 .020 .025 FLY 2 deg ATDC 1 .006C .017C

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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