TM-9-2815-220-34
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED, 12-CYLINDER, ASSEMBLY; MODELS AVDS-1790-2C (2815-00-410-1203) AND AVDS-1790-2D (2815-00-410-1204)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
TM-9-2815-220-34 - Page 311 of 532
sleeves in the rocker arms fOr sCoRIng and loose-
ness. ±heCk bearing sLeeveS against limIts
speciF²ed In repaI³ standards (taBLe
3-13).
´eplaCe
bearing sleeve that do not meet these lImItsµ ¶n·
spect vaLve roCker arm roLlers fOr sCu¸¹ or sCore
ma³ks and Looseness on huBº ´otate roLLer and
CheCk ClearanCe bEtween ³olLer and HUb by mount-
Ing roCke³ arm seCur»Ly In a so¸t¼jawed VIse½ ¾et a
dIaL IndiCato³ agaInst ContaCt su³¹aCe o¸ roLLer and
move ³oLLer tHrough ext³emes o¸ Its traveLµ ¿heCk
readIng on the dIaÀ IndIcato³Á ÂÃmIts sHoUld be
I
0.0055
in.
maxiMuM±
Replace
roCker
ar²s
iÄ
rOLLe³S
Or
hUbS
are
da²aged´
InSpeµt adj¶ST·ng
S¸rewS (34) fOr S¹rippeD Or daMaged tHºeadS» ¼½e¸K
S¸rew By ¾¿ÀiNg S¸rew in and Ou¹ Of ºO¸Áer ar²sÂ
ÃÄrew MÅSÆ t¶Ç
f³eeÈyÉ ¼½e¸K SwiveÊ pad and
adJUS¹ing SCrew FoË F³ee roÌaÆiONÍ ÎarK daMaged
ParÆS ÏÐr ³epÈa¸eMentÑ
(3± Valve rockER A²m shAfts³
¿ÅeCk vaLve ³oCker
arm sha¸ts (14 and
3´±
Ær CraCks, sCUff, sCores and
Metal pIck Up or plUgged oIl passagesÇ ¿HeCk sÅa¸ts
agaInst LImits speCi¸ied In repair standards (tabLe
3µ13)³
´epaIr or replaCe UnservICeable sÈa¸ts (para
3É72)½
(4)
¶aLves:
·¸¹ º¸Lve He¸d»
¿heck Intake and eXhaUst
vaLves
±2
and
3,
¹IgÊ
3µ190)
ËÌr evidenCe o¸ pIttIngÍ
Imper¸ect seatIng, C³acks o³ warpage on valve
headµ Îeavy dIsCoLoratIonÏ bUrnIngÐ erosIonÍ or a
heavy Carbon deposIt on vaLve ¸aCe IndICates a
warped vaLveÊ
A
LIght ¹³osted appearanCe or mInor
dIsCoLoratIon on vaLve ¸aCe does not IndICate a
TM
9ÑÒ8Ó5ÔÒÒ0Õ3Ö
warped or unservIceable vaLve×
ØÙÚ
ºaLve STeM¼
¶nspeCt the vaLve stems and
the LoCking groove In tHe stems ÛÌr pIttingÜ sCoÝÞng,
CraCks, or damaged tIpsß ±heCk valvàs agaInst LIm-
Its speCI¸áed In repaIr standa³ds (table 3â13)Á ãeä
pLaCe vaLves tHat are warped, CraCkedÏ o³ Unserv·
ICeabLeµ
NOtE
Do not inte³pret te³mInatIon o¸ chrome
pLatIng on stem as a C³aCkß
²³´
½¾¿ve ÀpÁingsÂ
ånspeCt Inner sp³INg(æç, ¹Igè
éÉêëìí, inteTîmedIate sprIng
µ9¶,
and oUter spring
(8)
¸Ìr wear, cracksÏ set o³ otHer evIdenCe of ¹aIlUreï
¿heCk aðL sprIngs against LimIts speCI¸Ied In tHe
repaiR standa³ds (table
3µ13±Â
·6¸
ºÃLÄIe Å7NÆÇÈg ÉÊeËAÌneÍsÎ ÏÐÑve roTors, and
LoCKSÒ
ånspect valve sprIng retainers
Ó11
and
38±
and intake spráng seat (7ñ ¹or wear and CraCks½
±heck exHaUst valve roto³
Ô3Õ±
bY ³otatIng Inner
seCtionò ónner seCtIon mUst rotate ˳eeLyß ¶nspect
rotor ËÌr wear o³ craCksô ¶nspeCt sp³ing retaIner
loCks fOr Wear or CraCksõ öorn LoCks ÷iJø Åave
ridges on top ¹aceù ãeplaCe anY unservICeable
parús½
NO¹e
ûhree dI¹¸erent models o¸ exHaust vaLve
rotors, alL manU¹aCtUred by one manU¸aC·
turer, are optIonaL In thIs CyLInder assemü
BLyý ûwo o¸ tHese optIonaL rotors wáLL ro·
tate In eItHe³ dIreCtþonµ ûÅe otHe³ optIonaL
roto³ WáLL ³otate In one dIrectIon onLy½
Changº
Ò
3ÿÓ0Ó
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