Peugeot 308: Replacement : Front seat front and rear crossmembers

ESSENTIAL : Observe the safety and cleanliness recommendations .

ESSENTIAL : Observe the precautions to be taken for the pyrotechnic components .

CAUTION : All of the stripped surfaces must be protected by means of the approved electrolytic rezincing process .

CAUTION : The number of spot welds or weld beads required for assembling a new component must be identical to the number of spot welds or weld beads attaching the original component.

1. Information

Types of spot welds or beads using the electric arc process :

• MIG braze welding with cupro-aluminium filler used with an inert gas
• MAG welding with steel filler metal and active gas

Designation of the high strength panels :

• High strength (HSS) : High strength steel
• Very high strength (VHSS) : Very high strength steel
• Ultra high strength (UHSS) : Ultra high strength steel

N.B. : Use the products recommended by the manufacturer .

2. Tooling

Workshop equipment :

• Swan’s neck drill for cutting out electric spot welds
• Hot air blower

Tool	Reference	Description
	[1366-ZZ]	Toolkit for testing electric spot welds
	[1366]	Samples for testing electric spot welds
	[1126]	Set of drill bits for removing spot welds
	[FEIN-400E]	"FEIN-400E" electric knife kit-"C1" electric knife-"C2" "FEIN" offset hub saw blade-"C3" Blade no. 103

3. Preliminary operations

ESSENTIAL : Deactivate the pyrotechnic systems .

CAUTION : Perform the operations that are required prior to a disconnection of the ancillaries battery .

Disconnect the ancillaries battery.

CAUTION : Remove or protect the components that are in the repair area and that can be damaged by heat or dust.

Remove :

• The centre console
• The front seat
• The floor carpets (partly)
• The interior trims

Release the electrical harnesses.

4. Location of the replacement part

Identification	Description
(1)	Front seat cushion front crossmember
(2)	Front seat rear crossmember

5. Identification of replacement parts

5.1. Composition : Front seat front and rear crossmembers

Identification	Description	Thickness	Nature/classification
(1)	Front seat cushion front crossmember	1,15 mm	Ultra high strength (UHSS)
(2)	Front seat rear crossmember	1,75 mm	Ultra high strength (UHSS)

5.2. Identification of the parts adjacent to the replacement part

Identification	Description	Thickness	Nature/classification
(3)	Tunnel	1,35 mm	Very high strength (VHSS)
(4)	Front floor	0,75 mm	Very high strength (VHSS)
(5)	Inner sill	1,25 mm	Very high strength (VHSS)

6. Preparation of the replacement parts

CAUTION : When cleaning the mating edges, use scouring wheels only to avoid damaging the anticorrosion protection.

6.1. Preparation : Front seat cushion front crossmember

Mark then drill to a diameter of 7 mm for later plug welding.

Prepare the mating edges and protect them using a weldable primer (Index "C7").

N.B. : Apply the weldable primer on the internal faces of the panels to be welded.

6.2. Preparation : Front seat rear crossmember

Mark then drill to a diameter of 7 mm for later plug welding.

Prepare the mating edges and protect them using a weldable primer (Index "C7").

N.B. : Apply the weldable primer on the internal faces of the panels to be welded.

7. Cutting of the parts on the body

7.1. Cutting out : Front seat cushion front crossmember

Cut out the spot welds .

7.2. Cutting out : Front seat rear crossmember

Cut :

• The spot welds
• The spot welds over 2 thicknesses (at "a")

Remove :

• The front seat cushion front crossmember
• The front seat cushion rear crossmember

8. Cleaning and preparation of the body

Prepare the mating edges and protect them using a weldable primer (Index "C7").

N.B. : Apply the weldable primer on the internal faces of the panels to be welded.

Prepare the mating edges and protect them using a weldable primer (Index "C7").

N.B. : Apply the weldable primer on the internal faces of the panels to be welded.

9. Adjustment

Position :

• The front seat cushion front crossmember
• The front seat cushion rear crossmember
• The components for adjusting

Clamp the part into position.

10. Welding

CAUTION : Set the welding station.

Setting of the welding station :

• Electric spot weld testing ; Using the tool [1366-ZZ]
• Samples for testing electric spot welds ; Using the tool [1366]

CAUTION : The number of spot welds or weld beads required for assembling a new component must be identical to the number of spot welds or weld beads attaching the original component.

10.1. Welding : Front seat cushion front crossmember

Weld with MAG plug welds.

Grind the MAG plug welds.

10.2. Welding : Front seat rear crossmember

Weld :

• By means of MAG plug welds
• By means of MAG plug welds in 2 thicknesses (at "b")

Grind the MAG plug welds.

11. Sealing protection

Apply :

• A layer of etch primer to the zones exposed
• Sealing mastic (index "A1")
• Anti-chip protection (index "C4")

Painting, then spraying of the index "C5" product into the hollow sections in the repair zone.

12. Additional operations

Refit the electrical harnesses and reinstall all removed components.

13. Reinitialisation

ESSENTIAL : Reactivate the pyrotechnic systems .

CAUTION : Perform the operations that are required after reconnecting the ancillaries battery .

Reconnect the ancillaries battery.