Wheel Lug Nut - Service Tips for Properly Torquing
Group: CHASSISNumber: 99-50-010
Date: NOVEMBER, 1999
Model: ALL
Subject: WHEEL LUG NUT TORQUE - SERVICE TIP
DESCRIPTION:
This bulletin provides the proper procedure for torquing the wheel lug nuts.
NOTE: Use of an air impact tool for wheel lug nut installation without the applicable torque limiting socket is not recommended.
Air impact tools typically used for wheel lug nuts can generate up to 300 lb-ft (400 Nm) of torque. Overly torqued and/or unevenly torqued wheel lug nuts may cause:
- Distortion of the wheel hub
- Distortion of the brake disc
- Brake disc runout
- Brake vibration and pulsation
- Damage to wheel rim
- Damage to the wheel nuts and lugs Steering wheel vibration and shimmy
PROCEDURE:
All wheel lug nuts should be tightened to specification using a torque wrench or using an applicable torque stick (torque limiting impact socket) supplied by ACCUTORQ (TM) (or equivalent) on a 1/2 inch drive impact tool. The "ACCUTORQ (TM)" lug nut socket limits the torque of the air impact tool, preventing over tightening or uneven tightening of the wheel lug nuts.
For the correct wheel lug nut torque specification, refer to the appropriate Shop Manual. The chart below summarizes the factory recommended wheel lug nut specification:
NOTES:
1. Follow the torque pattern as shown below
2. Always use the correct specification ACCUTORQ (TM) lug nut torque socket for the application (color of the tool indicates the torque specification).
3. Do not use a torque stick to remove wheel lug nuts.
4. Do not use air impact tools on locking wheel lug nuts. They are to be hand-torqued only.