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Tune-Up Specifications - John Deere

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
M,MT .020 .025 FLY TDC 1-2 .012C .012C For magneto set point gap to .015
L,LA .020 .025 FLY TDC 1-2 .006H .008H For magneto set point gap to .015
H (All Fuel) .015 .030 FLY   1-2 .015H .015H Spark occurs when dot or "LH-Impluse" aligns with index on cover or case.
G (All Fuel) .021 .030 FLY   1-2 .020H .020H For magneto set point gap to .015 - Spark occurs when dot or "LH-Impulse" aligns with index on cover or case.
D (All Fuel) .015 .030 FLY   1-2 .030H .030H Spark occurs when dot or "LH-Impluse" aligns with index on cover or case.
B (All Fuel & Gas) .015 .030 FLY   1-2 .020H .020H Spark occurs when dot or "LH-Impluse" aligns with index on cover or case.
A (All Fuel & Gas) .021 .030 FLY   1-2 .020H .020H For magneto set point gap to .015 - Spark occurs when dot or "LH-Impulse" aligns with index on cover or case.
80 Cranking Engine .020 .025 FLY 30 deg. BTDC 1-2-3-4      
70 Cranking Engine .020 .025 FLY 30 deg. BTDC 1-2-3-4 .020H .020H  
70 (LP), 60 (LP) .022 .030 FLY 5 deg ATDC 1-2 .020H .020H  
70 (Gas) .022 .030 FLY 10 deg. ATDC 1-2 .020H .020H  
70 (All Fuel), 60 (All Fuel) .022 .030 FLY TDC 1-2 .020H .020H  
50 & 60 (LP & Gas) .022 .030 FLY 5 deg ATDC 1-2 .020H .020H  
50 (All Fuel) .022 .030 FLY TDC 1-2 .020H .020H For point gap, for LP set TDC.
40 (All Fuel) .022 .025 FLY 3 deg ATDC 1-2 .012C .012C For point gap, for LP set TDC.

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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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t ... [Read Article]

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