DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 444 of 1422
.±
DMWR 9281S220
5-52.l
(Cont)
b±
Left Bank Camshaft Gear Housing (paRt no² 1³682702)²
´ecµaiM 2.50 Inc¶
ca· ¸oRe ¸earin¹ suRface by ºEtaµsPray.
´eFer to O»¼ ½168270³ (5/322).
N¾T¿
;
Ào demonstrate PRoFiciency and attain certiFied status, an oPeRatoR s¶AÁÂ
Ã
fÁaÄe sPray a test Piece in accoRdance wit¶ t¶Is sÅecifÆcation W¶ic¶ sÇaÁÁ
be destRuctiveµy and ÈtaÁÁo¹RaPÉIcaÁµy examined to assure bond inte¹rIty
and coatin¹ soundnes.
Êo MaintaIn certIfIed statusË
an oPeratoR ·ust consIstentÁy PRoduce accePtÌ
abµe RePaiRs reÍative to t¶e FÁame sPRayed coatIn¹ and Pass a yearÁy destRucÎ
tive exaÄinatIon foR ¸ond and coatin¹ IntϹRity²
(1)
ʶorou¹¶Ðy cÑean and de¹rease ¶ousin¹ usin¹ trIchµoroet¶yµene de¹ReaseR²
(2)
Set ¶ousIn¹ In miÁµin¹ Mac¶ine and undercut 2.50 Inch caÒ boRe beaRin¹
surFace ¸y .040 Inch or as necessary to eÁiMinate surface defects
(fi¹Ó 5-53.2)
(5Ô307).
Õ3)
ÖRePare ¸earin¹ suRF ace In accordance wIth standard ×taÁizin¹ ProceduRe as
Foµµows:
Õa)
Øask areas, not to ¸e metaÁsPrayedÙ wit¶ suItabµe ¹rit ¸µast masKin¹ materÆaµ.
ÕÚ)
Grit bÁast ¸earin¹ suRFace with cÁeanÛ oiµ FRee 25 mes¶ c¶Iµµed iron ¹rit
oR cut an ³Ü t¶Read µead .Ý20 inc¶ deeP.
(4)
ÞeÄove ¹rit bÑast maskin¹ MaterIaµ and reÄask wIt¶ suItabÁe thermosPRay
or PµasMasPray maskin¹ ÄaterIaµ.
(5)
ÖRe¶eat ¶ousin¹ to aPPRoxiMateÁy 15Ý°ß.
(6)
àPPÁy Øetco 445 aµuMinuM bronZe Powder (á»âãSTDä1687) to the beaRin¹ surÎ
face Usin¹ åetco 6Ö ÊherÄosPray or æØB çµasMasPRay System.
Coat surFaces sufÎ
ficèeétµy to aÁµoê For
ë
reMac¶inIn¹ oF t¶e boRe to draêIn¹ toµerances.
(7)
àfter ¶ousIn¹ has cooµed to rooÄ teMPerature,
ReÄove ·askin¹ and macÇine caÄ
¸oRe ì.í. to 2.500 to 2²50³ Inc¶esÓ
îOÊ¿
-±²
³-´µ
¶· ·¸¹º»»¼½»¾¿»»À½ÁÂÃ
ÄÅÆÇ
àïÁ mountin¹ surfaces RePaIred by t¶Is Process shaµÁ be 1Ý0% insPected For
coatðé¹ Inte¹rIty aFter ÄacÇinIn¹²
ʶe coatin¹ s¶aµñ
shoê
no bond seParatIonò at
th coatIn¹ to ¸ase metaµ interFace²
T¶e coatÆn¹ s¶aµÁ ¸e free fRoÄ bÁisteRIn¹Û
cracóin¹ô
c¶IPPin¹, and frayeõ ed¹es.
Êhere s¶aµµ be no bµeeõoöt of oIÁ oR other
conta÷inants t¶rou¹¶ the fInis¶ed coatin¹±
5Ô306.2
)
)
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