Home/Citroen/C-Elysee/Citroen C-Elysee I (2012-2016)/Repair manual/Side structure/Replacement: understructure (side member assembly)
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Replacement: understructure (side member assembly) Citroen C-Elysee I

Side structure ~729 words

WarningBefore any work on the structure of a vehicle with on board electric energy (electric vehicle/hybrid vehicle), the vehicle must be isolated by an authorised technician

WarningObserve the safety and cleanliness recommendations

WarningObserve the precautions to be taken for the pre-tensioning components

WarningAny repair work carried out on a vehicle with on board electric energy (electric vehicle/hybrid vehicle) must be carried out by an authorised person

WarningAll of the stripped surfaces must be protected by means of the approved electrolytic rezincing process

WarningThe number of spot welds necessary for the assembly of a new part must be identical to the number of spot welds fixing the original part

Information

Types of weld bead by electric arc procedure on this component

  • MIG brazing with cupro-aluminium rod used with an inert gas
  • MAG welding with steel rod and used with active gas

Designations of the high strength steels used in this document

  • High strength: high strength steel
  • THLE: very high strength steel
  • UHLE: ultra high strength steel

NoteUse the products recommended by the manufacturer

Tooling

Operation to be carried out with one of the following systems

toolReferencedesignation
[1366-ZZ]toolkit for testing electric spot welds
[1366]samples for testing electric spot welds
[1126]set of spot weld cutters
electric knife kit FEIN -"C1" electric knife -"C2" FEIN offset hub saw blade -"C3" blade no. 103
swan's neck drill for cutting out electric spot welds
hot air blower

Preliminary operations

Deactivate the pyrotechnic systems

Disconnect the ancillaries battery

WarningEither remove or protect those components which are in the repair zone and risk being damaged by the heat or the dust

Remove (repair side)

  • The front wing
  • The front door
  • The rear door
  • The front seat
  • The rear seat

WarningIf the vehicle has the Stop and Start system; remove-refit the voltage retention device

Release the wiring harnesses

Location of the replacement part

referencedesignation
(1)outer sill
(2)B post strengthener exterior inflating insert
(3)longeron front closing panel front inflating insert

Identification of replacement parts

Composition: outer sill

referencedesignationthicknessnature/classification
(1a)outer sill1.17 mmhigh strength
(1b)crimped nuts6 x 100-

Composition: secondary replacements parts

referencedesignationthicknessnature/classification
(2)B post strengthener exterior inflating insert--
(3)longeron front closing panel front inflating insert--

Identification of the parts adjacent to the replacement part

referencedesignationthicknessnature/classification
(4)centre pillar inner panel0.67 mmhigh strength
(5)rear wing inner panel front part0.67 mmmild steel
(6)rear wing0.67 mmmild steel
(7)centre pillar1.76 mmTHLE
(8)centre pillar lower reinforcement1.27 mmTHLE
(9)sill strengthener1.17 mmTHLE
(10)inner sill1.17 mmTHLE
(11)front pillar1.27 mmTHLE

Preparation of the replacement parts

WarningWhen cleaning the mating edges, use scouring wheels only to avoid damaging the anticorrosion protection

Preparation: outer sill

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

Mark then drill to diameter 6,5 mm (or 8 mm for the heavy thicknesses) for later plug welding

NoteApply the weld-through primer on the internal faces of the panels to be welded

Preparation: inflating inserts

Apply setting adhesive (index "A1") to the inflating inserts (2), (3)

Cutting of the part on the body

Cutting out: outer sill

Cut out the spot welds

"A" = 165 mm (minimum)

Mark at "a" then cut

NoteThe rear section of the outer sill must be cut to gain access to the electric spot welds

Cut out the spot welds

Detach the outer sill at the inflating inserts (2), (3); using a hot air gun

Remove the exterior longeron

Inflating inserts

Remove the inflating inserts (2), (3)

Cleaning and preparation of the body

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

NoteApply the weld-through primer on the internal faces of the panels to be welded

Position the inflating inserts (2), (3)

Seal the expanding or structural inserts

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

NoteApply the weld-through primer on the internal faces of the panels to be welded

Apply structural adhesive (index "B3")

NoteThe application of structural adhesive (index "B3") is necessary to replace the electric spot welds

Adjustment

Position

  • The outer sill (1)
  • The components for adjusting

Check the fits and clearances

Holds the part in position

Welding

WarningThe number of spot welds necessary for the assembly of a new part must be identical to the number of spot welds fixing the original part

WarningTake into account the difference in thickness of the part when setting the welding station

Weld with electric spot welds

Weld with electric spot welds

Weld with MAG plug welds

Grind the MAG plug welds

Sealing protection

Apply a phosphate-print layer to the zones laid bare

Apply underseal protection (index "C4")

application zonedistancetolerance
"C"25 mm+ 5 mm
"B"100 mm+ 5 mm

Apply a phosphate-print layer to the zones laid bare

Apply underseal protection (index "C4")

NoteDo not block the drain holes (at "b")

Apply a phosphate-print layer to the zones laid bare

Apply underseal protection (index "C4")

Apply a phosphate-print layer to the zones laid bare

Apply a sealing mastic (index "A1")

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

Additional operations

Refit the electrical harnesses and the components removed

Reinitialisation

Reactivate the pyrotechnic systems

WarningPerform the operations that are required following a reconnection of the ancillaries battery

Reconnect the ancillaries battery