DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 139 of 1422
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DMWR S.2815220
b.
Crankshaft main bearINg saddle aReas±
cRa²ksHafT maI³ bearI²G saddle aReas
(P/´ 1µ684¶08) ·a³ be Re·laimed by meTalspRayi²G a··ordI³G to The pro·edures
oUtlIned beLow¸
¹eFer
To Oº» ¼¼684¼08 ½5/29)¾
NOTE
¿o dEonstRate pRofiÀIeÁ·y a²d aTTaI² ·ertIfIed sTaTus, an opeRaToR
sHaLl FLaMe
Â
spray a TesT pie·e iN a··oRdaN·e wiTh This speÀifi·aTIon
wHI·h shalL be desTru·tIveÃy aNd MeTalloGrapHI·alLy exaMi³ed to assÄRe
bo²d i²TeGrIty aNd ·oaTiNG sound²ess¾
¿o mai²TaIn ·eRtIÅied sTatusÆ a² oÇeRaTor
musT ·oNsisTeNTly prodÄ·e
a··epTable reÇaiRs reLaTIve to THe flaMe spRayed ·oaTinG aNd pass a
yearLy destru·Tive examinaTIo² for boNd a³d ·oatiÁG INteGRITy¸
(±²
DeGrease blo·K e²suRING all GreaseÈ
dIÉTÈ and rusT Is reMoved fRoM
saddLe aReas.
Bevel alL sHarp edGes¸
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WasH alL areas to be metaLsprayed usiNG Êet·o Solve³T¾
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ÍasK ·ap matiÎG areas and areas beTÏee³ saddLes ÐITh ÑHerÒspray ÓasK
ÍaTeriaÔÈ
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±020" THI·k ·opperÈ brassÆ oR sHeet steel and ÍeT·o
A×tI-BoÎر
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ÙLuG oIL hoLes wIth GRapHIte plÄGs a²d GriT bLast beari²G saddle areas
To be metalsprayed usinG Ú25 a²GÄlar sTeel Grit aT 60 psi¸
½Û)
ÜreheaT saddÝe aRea To approxImatLey
200°Þ
usiÁG 6Ù TheRmospRay GuN¾
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Apply ÊeT·o 44Û SelfßBo²dI²G àlÄMInÄM BroNze áomposite ÙoâdeR ½adHerInG
To ͺãßS¿ä 1687) usi²G ÊeT·o 6Ù ¿herMospRay SysTem±
å²der·uTtiNG Is ²oT
æe·essary as maTerial ·a² be finisHed To a feaTheR edGe¾
çLlow .010ÖÖ
¹
è050é for FI²IshiNG¸
½a)
Spray aNGêe shouLd be as ·lose to ë0 deGree To subsTraTe sÄrfa·e as
Çra·Ti·al.
½b)
ìse parameTers as pa·ked wIth MaTerIalÈ GivinG spe·ial aTTe²Tio² To
tHe spray disTaN·e.
½·)
Blo·k May be sprayed In verTI·al or HoRIZo³Tal posITion¸
íî)
ïeað ·oaTI³G wHiñe hoTÈ
ÄsI²G ÍeT·o ò85 seaLer To Improve Ma·HI²I²Gó
½8ô
Êa·HI³I³G is do³e dry wiTh eITHer lIne boriNGõ
ÃI²e HoNI²Gö or HorI÷oNø
ùaL borI³G ma·HI²es usI²G feeds a²d speeds norMally used for Ma·Hi²I²G
·asú Iro².
ûse 88ü Grade ·arboloy Tool bIT or eqÄIvale²ý sQÄare tool
witH 1/ü2 in·H rþdIusö seT aT 45 deGRee a²GLe To parT±
ÿeep Tool sHaRp
a³d Āa·HIne ÄsI³G tHe FolloâI³G paraMeteRs:
ïÄrf a·e worā speeĂ
¿RaveRse speed
ăĄF eed
5/26¸2
600 fT/MI²
¾002ąÖ
-
Ć004ć per reVolĈTIo³
¾0µ0" per sideÈ rĉÄGH ·ÄT
±00ÛÖÖ
peR sideÈ fi²IsH ·ÄT
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