DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 138 of 1422
DMWR 9·2815±²0
5-12.l
(Cont)
(4)
(5)
±6)
²a³
± b)
( 7)
Grit bLast areas to be sprayed usiNg G25 aNgULar sTeeL grIT, sprayed at
60 psi´
PReheaT area to be spµayed To approxImaTeLy 200°F
UsIng the 6P
¶heRmospRay gUN.
AppLy a metaLspRay coaTing wiTh tHe 6· ¸heRmospRay gUn UsiNg paRameteRs
packed wiTh THe maTeRiaL¹ giving specIaL
ttention To the spray dIstaNce
and maintaiNiNg The spray aNgºe as cºose To 90° To the sUbstraTe sUr»
face as pµacticaº.
Do noT aLLow the part TemperatURe To exceed 300°¼½
¾nterrUpT spRayiNg as reqUired¿
WheN sprayiNg maIn bearINg fIt aRea Use Metco 4ÀÁ SeLfÂBondIng ÃLUminUm
BRoNze CoÄÅosite Powder ²adheÆing to ǾÈ-S¶D-ÉÊ8ËÌ´
ALºoÍ extRa ´0Î0
- Ï050 inch coating thickNess foR fINIshINgÐ
ÑheN spµÒyiNg side Óating suRfaces Use Çetco 447 ÔeLf-BoNdINg
ÇoLybedenUÕ-ÖIckeL×ALUmiNUm ØomposIt ÙowdeR ±adheRIng to
MIL-STD-1687).
AÚLoÛ eXtra .0Î0 iNcH
coating thIckNess for fINishing.
Seaº Çetco 4Ü5 coaTing whILe hot¹ To iÕpRove machiNiNgÝ UsiNg Çetco Þ85
SeaLeRÏ
(8)
¼iNishing´
(a)
Main bearIng fit aRea (Metco 445)ß
¾f bàock aNd cap are ÕacHined
togetheµá machiniNg Is done dRy UsIng feeds aNd speeds NoRmaÚºy Used
for cast iroN´
¾f caps aRe macHIâed individUaLãyÝ
a mIÚLIng machine
is Used´
äse a 88å gµade carboæoy TooL bIt oR eqUivaLeNt sQUaRe tooL
with ç/åè Inch µadius set at 4Á degRee angLe To paµt½
Keep tooL shéRp
aNd ÄachêNe at the foLLowIng paRaÕeTers:
SUµf ace ëoRì speed
íµaveµse
speed
îNfeed
600 ft´/miN´
´002ïï - ½004" peµ µevoðUTioN
½0É0ïï peR sideÝ RoUgh cUt
ß005ñò per sIdeÝ finish cUt
(b)
SIde mating sUµfaces (Metco 447).
GRiNd UsiNg a sUrface gRóndeR ôith
46J oµ 4Êõ siLIcon caRbide wheeð or Hand fiLe.
Do NoT ºoad wheeL wheN
µoUghiNg´
öeave ¿002" ×
.003÷ afTer RoUghIng foµ finaº grIâd½
Dµess
wheeø befoRe grindINg to finisù size½
úO¶E
ûUaLity coNtµoL ôiLL iNspect fiNished paRt to InsURe adheReNce To This
pµocedUre´
±ü)
ALà moUNtINg sUµfaces repaýµed by this process shaLL be Þ00% iNspecþed
)
foµ coaTiNg integµIty afteµ machIning½
¶he coatiNg shaLL show no boNd
separaÿioN at the coatiNg to base Āetaº iNteµface½
¶he coating shaLL be
(
fµee fµoā bàisteĂiNgÝ
cµackingÝ
chIppingÝ aNd frayed edges.
¸heRe shaLL
ă
be no bLeedoUt of oĄL oR otheR coNtaÕINants thµoUgh the finIshed coating´
ą/2Ê.Ć
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