INFINITI QX56 2006 Factory Service Manual

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Precautions in Repairing High Strength SteelEIS004TF
High strength steel is used for body panels in order to reduce vehicle weight.
Accordingly, precautions in repairing automotive bodies made of high strength steel are described below:
HIGH STRENGTH STEEL (HSS) USED IN NISSAN VEHICLES
SP130 is the most commonly used HSS.
SP150 HSS is used only on parts that require much more strength.
Read the following precautions when repairing HSS:
1. Additional points to consider

The repair of reinforcements (such as side members) by heat-
ing is not recommended since it may weaken the component.
When heating is unavoidable, do not heat HSS parts above
550°C (1,022 °F).
Verify heating temperature with a thermometer.
(Crayon-type and other similar type thermometer are appro-
priate.)

When straightening body panels, use caution in pulling any
HSS panel. Because HSS is very strong, pulling may cause
deformation in adjacent portions of the body. In this case,
increase the number of measuring points, and carefully pull
the HSS panel.

When cutting HSS panels, avoid gas (torch) cutting if possi-
ble. Instead, use a saw to avoid weakening surrounding areas
due to heat. If gas (torch) cutting is unavoidable, allow a mini-
mum margin of 50 mm (1.97in).
Tensile strength Nissan/Infiniti designation Major applicable parts
373 N/mm
2
(38kg/mm2 ,54klb/sq in) SP130

Front inner pillar upper

Front pillar hinge brace

Outer front pillar reinforcement

Other reinforcements
785-981 N/mm
2
(80-100kg/mm2
114-142klb/sq in) SP150

Outer sill reinforcement

Main back pillar
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When welding HSS panels, use spot welding whenever possi-
ble in order to minimize weakening surrounding areas due to
heat.
If spot welding is impossible, use M.I.G. welding. Do not use
gas (torch) welding because it is inferior in welding strength.

The spot weld on HSS panels is harder than that of an ordi-
nary steel panel.
Therefore, when cutting spot welds on a HSS panel, use a
low speed high torque drill (1,000 to 1,200 rpm) to increase
drill bit durability and facilitate the operation.

SP150 HSS panels with a tensile strength of 785 to 981 N/
mm
2 (80 to 100 kg/mm2 , 114 to 142 klb/sq in), used as rein-
forcement in the door guard beams, is too strong to repair.
When these HSS parts are damaged, the outer panels also
sustain substantial damage; therefore, the assembly parts
must be replaced.
2. Precautions in spot welding HSS This work should be performed under standard working condi-
tions. Always note the following when spot welding HSS:

The electrode tip diameter must be sized properly according
to the metal thickness.

The panel surfaces must fit flush to each other, leaving no
gaps.
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Follow the specifications for the proper welding pitch.
Unit:mm
Foam RepairEIS004TG
During factory body assembly, foam insulators are installed in certain body panels and locations around the
vehicle. Use the following procedure(s) to replace any factory-installed foam insulators.
URETHANE FOAM APPLICATIONS
Use commercially available spray foam for sealant (foam material) repair of material used on vehicle. Read
instructions on product for fill procedures.
FILL PROCEDURES
1. Fill procedures after installation of service part.
–Remove foam material remaining on vehicle side.
–Clean area in which foam was removed.
–Install service part.
–Insert nozzle into hole near fill area and fill foam material or fill in enough to close gap with the service
part.
2. Fill procedures before installation of service part.
–Remove foam material remaining on vehicle side.
–Clean area in which foam was removed.
–Fill foam material on wheelhouse outer side.
NOTE:
Fill in enough to close gap with service part while avoiding
flange area.
–Install service part.
NOTE:
Refer to label for information on working times. Thickness (t)
Minimum pitch ( )
0.6 (0.024)
0.8 (0.031)
1.0 (0.039)
1.2 (0.047)
1.6 (0.063)
1.8 (0.071) 10 (0.39) or over
12 (0.47) or over
18 (0.71) or over
20 (0.79) or over
27 (1.06) or over
31 (1.22) or over
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Replacement OperationsEIS004TH
DESCRIPTION
This section is prepared for technicians who have attained a high level of skill and experience in repairing col-
lision-damaged vehicles and also use modern service tools and equipment. Persons unfamiliar with body
repair techniques should not attempt to repair collision-damaged vehicles by using this section.
Technicians are also encouraged to read Body Repair Manual (Fundamentals) in order to ensure that the orig-
inal functions and quality of the vehicle can be maintained. The Body Repair Manual (Fundamentals) contains
additional information, including cautions and warnings, that are not including in this manual. Technicians
should refer to both manuals to ensure proper repairs.
Please note that this information is prepared for worldwide usage, and as such, certain procedures may not
apply in some regions or countries.

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The symbols used in this section for cutting and welding / brazing operations are shown below.
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Front pillar butt joint can be determined anywhere within shaded
area as shown in the figure. The best location for the butt joint is
at position A due to the construction of the vehicle. Refer to the
front pillar section.

Determine cutting position and record distance from the locating
indent. Use this distance when cutting the service part. Cut outer
front pillar over 60 mm above inner front pillar cut position.

Prepare a cutting jig to make outer pillar easier to cut. Also, this
will permit service part to be accurately cut at joint position.

An example of cutting operation using a cutting jig is as follows.
1. Mark cutting lines. A: Cut position of outer pillar
B: Cut position of inner pillar
2. Align cutting line with notch on jig. Clamp jig to pillar.
3. Cut outer pillar along groove of jig. (At position A)
4. Remove jig and cut remaining portions.
5. Cut inner pillar at position B in same manner.
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HOODLEDGE

Work after radiator core support has been removed.
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FRONT PILLAR

Work after rear hoodledge reinforcement has been removed.
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