Exhaust System - Heat Shield Rattling Noises
Classification: EM10-010Reference: ITB10-052
Date: August 12, 2010
2004 - 2010 QX56; EXHAUST HEAT SHIELD NOISE
APPLIED VEHICLE: 2004 - 2010 QX56 (JA60)
IF YOU CONFIRM:
A noise is coming from the front exhaust tube heat shield(s) due to rattle.
ACTION:
Secure the heat shield(s) with new band clamps (see PARTS INFORMATION below).
^ Refer to the SERVICE PROCEDURE.
NOTE:
Do NOT replace the front exhaust tube for this incident if it should occur.
PARTS INFORMATION
CLAIMS INFORMATION
IMPORTANT:
The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire SERVICE PROCEDURE as it contains information that is essential to successfully completing this repair.
SERVICE PROCEDURE
WARNING:
The exhaust system may be hot. Allow to cool down before inspection/repairs.
NOTE:
Exhaust system parts do not need to be removed for this inspection/repair.
1. Raise the vehicle on a hoist.
2. Inspect the heat shields on the front exhaust tube for the following:
^ Heat shield contact with the exhaust tube.
^ Separated/missing band clamp(s).
^ Missing "stand-off" (see Figure 4).
3. If a heat shield is found contacting the exhaust tube pry it away to allow a minimum 1 mm (.040 inch) space.
^ Road test the vehicle to verify the repair.
4. If a band clamp is separated or missing install new band clamps as needed.
^ For band clamp locations refer to Figure 5.
^ If it applies: Position the band clamp(s) between the "dimples" or on top where the "stand-offs" are located (see Figure 3 and 4).
> The "stand-offs" cannot be seen: They are welded on the underside of the heat shield.
> If the "stand-off' is missing this bulletin does not apply.
5. Secure the band clamp with the hex bolt located on the side (or on top if needed). See Figure 1 above for example.
WARNING:
Do Not install the hex bolt on the bottom of the exhaust tube.
^ Band clamp hex bolt torque: 4.0 - 5.5 Nm (0.4 -0.56 Kg-m 2.9 - 4.0 ft.lb)
6. After securing the band clamp cut off the clamp's excess at the end.
^ Wrap the end of the band clamp over the hex bolt and then cut off the excess band clamp within 5 mm (0.2 inches) past the hex bolt (see Figure 2).
WARNING:
Be careful of sharp edges after cutting off the excess band clamp.
7. After band clamp(s) installation road test the vehicle to verify the repair.