Contents Wiring diagrams Section: Side structure All sections

Replacement: outer sill Citroen C4 II

Side structure ~712 words

WarningObserve the safety and cleanliness recommendations

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

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

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

toolReferencedesignation
[1366-ZZ]toolkit for testing electric spot welds
[1366]samples for testing electric spot welds
[1126]set of spot weld cutters
swan's neck drill for cutting out electric spot welds
hot air blower

Preliminary operations

Disconnect the battery

Deactivating the pyrotechnic systems

WarningRemove or protect the components that are in the repair area and that can be damaged by heat or dust

Remove

  • The body sill plugs (1)
  • The front door
  • The rear door
  • The cover
  • The front wing
  • The interior trims

Detach

  • The front door seal
  • The rear door seal

WarningIf the vehicle is fitted with the Stop and Start system, discharge the power accumulator

Release the wiring harnesses

Location: replacement part

referencedesignation
(2)outer sill

Identification of the replacement part

Composition: outer sill assembly

referencedesignationthicknessnature/classification
(2)outer sill assembly--
(2a)outer sill0,67 mmmild steel
(2b)longeron front closer0,67 mmmild steel

Identification of the parts adjacent to the replacement part

referencedesignationthicknessnature/classification
(3)front pillar lower gusset2,2 mmTHLE
(4)inner sill2,5 mmhigh strength
(5)rear side member2,44 mm / 1,76 mmmild steel / high strength
(6)rear wing inner panel front section0,67 mmmild steel
(7)centre pillar lower reinforcement1,17 mmhigh strength
(8)door pillar stiffener1,27 mmhigh strength
(9)inner sill inner panel0,77 mmTHLE

Preparation: replacement part

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

"A" = 62 mm

Mark at "a" in the cutting zone "A", then cut

"B" = 83 mm

Mark at "b" in the cutting zone "B", then cut

NoteThe dimensions "A", "B" are given as a guide and may change according to different examples of replacement of the outer sill

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

"C" = 70 mm

Mark (at "c") in the cutting zone "C" then cut

NoteThe dimension "C" is given as a guide and can change depending on the different cases for replacement of the outer sill

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

Cutting of the part on the body

"D" = 52 mm

Mark (at "d") in the cutting zone "D" then cut

"E" = 73 mm

Mark (at "e") in the cutting zone "E" then cut

NoteThe dimensions "D", "E" are given as a guide and may change according to different examples of replacement of the outer sill

"F" = 255 mm

Mark (at "f") in the cutting zone "F" then cut

NoteThe dimension "F" is given as a guide and can change depending on the different cases for replacement of the outer sill

Cut out the spot welds

Separate the exterior side member at the expanding inserts; using the hot air blower

Remove the exterior longeron

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

Apply a setting adhesive (index "A1")

Adjustment

Position

  • The outer sill
  • The components for adjusting

Check the fits and clearances

Check the position; using one of the approved measurement systems

Adjust the cuts (if necessary)

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

Weld by MAG bead (at "g", "h")

Grind the MAG weld beads

Weld by MAG bead (at "j")

Grind the MAG weld beads

Weld by MAG bead (at "k")

Grind the MAG plug welds

Weld with electric spot welds

Sealing protection

Apply stone chip protection

Apply a phosphate-print layer to the zones laid bare

Apply a sealing mastic (index "A1")

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 body sill plugs (1)
  • The electrical harnesses and the removed components

Reinitialisation

Carry out the additional operations

Put the pyrotechnic systems into service

WarningPerform the operations to be carried out following reconnection of the battery

Reconnect the battery