MG MG6 Series 2011 - Page 879

CollisionRepair
BodyRepair
UnderbodyProtectionRepairs
Wheneverbodyrepairsarecarriedout,ensurethatfullsealing
andcorrosionprotectiontreatmentsarereinstated.This
appliesbothtothedamagedareasandalsotoareaswhere
protectionhasbeenindirectlyimpaired,asaresulteitherof
accidentdamageorrepairoperations.
Removecorrosionprotectionfromthedamagedareabefore
straighteningorpanelbeating.Thisappliesinparticular
topanelscoatedwithwax,PVCunderbodysealer,sound
deadeningpadsetc.
Warning:DONOTuseoxy-acetylenegasequipmentto
removecorrosionpreventionmaterials.Largevolumesof
fumesandgasesareliberatedbythesematerialswhen
theyburn.
Note: Equipment Equipment
Equipment
for for
for
the the
the
removal removal
removal
of of
of
tough tough
tough
anti-corrosion anti-corrosion
anti-corrosion
sealers sealers
sealers
offers offers
offers
varying varying
varying
degrees degrees
degrees
of of
of
speed speed
speed
and and
and
effectiveness. effectiveness.
effectiveness.
The The
The
compressed compressed
compressed
air-operated air-operated
air-operated
scraper scraper
scraper
(NOT (NOT
(NOT
an an
an
air air
air
chisel) chisel)
chisel)
offers offers
offers
a a
a
relatively relatively
relatively
quiet quiet
quiet
mechanical mechanical
mechanical
method method
method
using using
using
an an
an
extremely extremely
extremely
rapid rapid
rapid
reciprocating reciprocating
reciprocating
action. action.
action.
Move Move
Move
the the
the
operating operating
operating
end end
end
of of
of
the the
the
tool tool
tool
along along
along
the the
the
work work
work
surface surface
surface
to to
to
remove remove
remove
the the
the
material. material.
material.
Themostcommonmethodofremovalisbymeansofahot
airblowerwithintegralscraper.Oneofthemostefcient
methods,istherapidcutting'hotknife'.Thistoolusesawide
bladeandisabletobeusedeasilyinproledsectionswhere
accessisotherwisedifcult.
Usethefollowingprocedurewhenrepairingunderbody
coatings:
1.Removeexistingunderbodycoatings.
2.Afterpanelrepair,cleantheaffectedareawithasolvent
wipe,andtreatbaremetalwithanetchphosphate
material.
3.Re-primetheaffectedarea.
Caution:DONOT ,underanycircumstances,apply
underbodysealerdirectlytobaremetalsurfaces.
4.Replaceallheat-fusibleplugswhichhavebeendisturbed.
Wheresuchplugsarenotavailableuserubbergrommets
ofequivalentsize,ensuringthattheyareembeddedin
sealer.
5.Maskoffallmountingfacesfromwhichmechanical
components,hosesandpipeclips,havebeenremoved.
Underbodysealermustbeappliedbeforesuch
componentsareretted.
6.Brushsealerintoallexposedseams.
7.Spraytheaffectedareawithanapprovedservice
underbodysealer.
8.Removemaskingfromcomponentmountingfaces,and
touch-inwherenecessary.
Afterrettingmechanicalcomponents,includinghosesand
pipesandotherxtures,maskoffthebrakediscsandapply
acoatofapprovedunderbodywax.
Note:Whererepairsincludetheapplicationofnish
paintcoatsintheareasrequiringunderbodywax,carry
outpaintoperationsbeforeapplyingwax.
UnderbodyWax
Theunderbodywaxmustbereinstatedfollowingallrepairs
affectingwheelarchpanels.Thewaxisappliedoverpaintsand
underbodysealers.
Removeoldunderbodywaxcompletelyfromazoneextending
atleast200mmbeyondtheareawherenewunderbodysealer
istobeapplied.
CavityWaxInjection
Afterrepairs,alwaystreatareaswithanapprovedcavity
wax.Inaddition,treatallinteriorsurfaceswhichhavebeen
disturbedduringrepairswhethertheyhavebeentreatedin
productionornot.Thisincludesallboxmembers,cavities
anddoorinteriors.Itispermissibletodrillextraholesfor
accesswherenecessary,providedthesearenotpositioned
inload-bearingmembers.Ensurethatsuchholesaretreated
withasuitablezincrichprimer,brushedwithwaxandthen
sealedwitharubbergrommet.
Beforewaxinjection,ensurethatthecavitytobetreatedisfree
fromanycontaminationorforeignmatter.Wherenecessary,
clearoutanydebrisusingcompressedair.
EnsurethatcavitywaxisappliedAFTERthenalpaintprocess
andBEFORErettinganytrimcomponents.
Duringapplication,ensurethatthewaxcoversallangeand
seamareasandthatitisadequatelyappliedtoallrepairedareas
ofbothnewandexistingpanels.
Itshouldbenotedthatnewpanelassembliesandcomplete
bodyshellsaresuppliedwithoutwaxinjectiontreatment.
Ensurethatsuchtreatmentiscarriedoutafterrepairs.
Effectivecavitywaxprotectionisvital.Alwaysobservethe
followingpoints:
•Completeallpaintrenishoperationsbeforewax
application.
•Cleanbodypanelareasandblow-cleancavitiesif
necessarybeforetreatment.
•Maintainatemperatureof18°C(64°F)during
applicationanddrying.
•Checkthespraypatternofinjectionequipment.
Version2.0863