1979-1983 MONARCH, ZEPHYR 1979-1997 COUGAR 1980-1983 MARK VI 1980-1998 CONTINENTAL, TOWN CAR 1981-1986 LYNX 1983-1986 MARQUIS 1984-1992 MARK VII 1984-1994 TOPAZ 1986-1997 SABLE 1987-1989 TRACER 1987-1997 GRAND MARQUIS 1991-1994 CAPRI 1991-1997 TRACER 1993-1998 MARK VIII 1995-1998 MYSTIQUE
1979-1996 BRONCO 1979-1997 ECONOLINE, F-150-350 SERIES 1984-1990 BRONCO II 1984-1997 RANGER 1986-1997 AEROSTAR 1988-1997 F SUPER DUTY 1991-1997 EXPLORER 1993-1997 VILLAGER 1995-1998 WINDSTAR 1997 EXPEDITION 1998 NAVIGATOR
The use of air impact tools to tighten wheel lug nuts can lead to overtightened and/or unevenly tightened wheel lug nuts. Air impact tools typically used for wheel lug nut removal and installation can generate up to 475 N-m (350 lb-ft) of torque. Overtightened and/or unevenly torqued wheel lug nuts may cause:
Distortion of the wheel hub
Distortion of the brake rotor
Brake rotor runout
Damage to the wheel
Damage to the wheel nuts and studs
All wheel lug nuts should only be tightened to specification using a torque wrench or by using the Rotunda ACCUTORQ 164-R0314 or equivalent on a 1/2" drive air impact tool. The "ACCUTORQ" lug nut sockets limit the torque of the air impact tool, preventing overtightening or uneven tightening of the wheel lug nuts. The torque limiting devices (regulators) on air impact tools will not reduce the output torque enough to prevent overtightening of the wheel lug nuts.
REFER TO THE APPROPRIATE SERVICE MANUAL OR THE CHART IN FIGURE 1 FOR THE CORRECT WHEEL LUG NUT TORQUE SPECIFICATION. THE CHART IN FIGURE 1 ALSO PROVIDES THE CORRECT "ACCUTORQ" LUG NUT SOCKET TO USE.
Figure 1 - Article 98-5A-4
The "ACCUTORQ" socket is intended for lug nut installation, not removal. When using the "ACCUTORQ" socket, the output torque of the air impact tool must be set to 217-339 N-m (160-250 lb-ft), usually this will be the lowest setting on the air impact tool.
The "ACCUTORQ" lug nut sockets are available through Rotunda Equipment. The four-piece set (164-R0314) fits most Ford Motor Company cars and light trucks. The tool set consists of four (4) lug nut sockets and a storage case. The set can be ordered by calling Rotunda Equipment at 1-800-ROT-UNDA (768-8632).
AIR IMPACT TOOLS SHOULD NOT BE USED TO TIGHTEN WHEEL LUG NUTS UNLESS THE "ACCUTORQ" LUG NUT SOCKET OF THE CORRECT SPECIFICATION IS USED.
DO NOT USE AIR IMPACT TOOLS ON LOCKING WHEEL LUG NUTS. THEY ARE TO BE HAND-TORQUED ONLY.