SPARK PLUG TORQUE CHART:

GASKET-TYPE PLUGS: Torque Limits
PLUG SIZE	CAST-IRON HEAD	ALUMINUM HEAD
10 mm 12 mm 14 mm 18 mm	8 - 12 Lbs/Ft. 10 - 18 Lbs/Ft. 20 - 30 Lbs/Ft. 32 - 38 Lbs/Ft.	8 - 12 Lbs/Ft. 10 - 18 Lbs/Ft. 18 - 22 Lbs/Ft. 28 - 32 Lbs/Ft.
GASKET-TYPE PLUGS: Turn Limits
PLUG SIZE	CAST-IRON HEAD	ALUMINUM HEAD
10 mm 12 mm 14 mm 18 mm	1/4 Turn 1/4 Turn 1/4 - 3/8 Turn 1/4 Turn	1/4 Turn 1/4 Turn 1/4 Turn 1/4 Turn

TAPER SEAT PLUGS: Torque Limits
PLUG SIZE	CAST-IRON HEAD	ALUMINUM HEAD
14 mm 18 mm	10 - 20 Lbs/Ft. 15 - 20 Lbs/Ft.	10 - 20 Lbs/Ft. 15 - 20 Lbs/Ft.
TAPER SEAT PLUGS: Turn Limits
PLUG SIZE	CAST-IRON HEAD	ALUMINUM HEAD
14 mm 18 mm	1/16 Turn 1/16 Turn	1/16 Turn 1/16 Turn
Turns: Install finger tight plus number of turns listed in chart.

HR 1-75

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