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

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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