DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 329 of 1422
)
)
DMWR 9-2815-220
5-37.
(Cont)
(b)
Cylinder boRe honIng.
1
Honing stones
(3
and
4,
fig±
2±2) ²2/8
)
·
are lIsTed in TabLe
2³1
0´2/µ
)± -²he stones are used alteRnately aRound
³
the honing head±
±² da³reEs
F
´
µhe hone angle should be
35;4e
to the hoRizonTaL¶
·
Spindle speed shoUld be
77
rpm, wiTh a verticaL RecIpRocatIng Rate of
±3
cycLes per minuTe¸
3
²he surface fInIsh should be developed in ¹o stages±
ºough hone The
eNTIRe Le»gTh of The bore¼ using ModeRaTely heavy stone pressUrE¼ unTil The rIng
Ridge Is Re½ved and The enTire bore has a ¾ross haTch patTeRn±
¿inisÀ hone
_±
usIng The same sTonesÁ wItÀ very LighT pRessÂRe, for approxIMaTeLy fIve To eighT
strokes±
²his opeRatIon will ReÃve roÂgh edges and fragÄented Åtal left froM
TÆe RoÂgh hone operation±
ÇOµÈ
Éhe ring RIdge May be reMoved using short stones and a short strokIng
acTIon pRior to the full rough and finish hone cycLeÊ
Ënder no ciRcuMÌ
stances shoÂld shoRt cycle sTRokes be peRfoÍed afteR The full lengTh
stRokes have been coÎpLeTed Ê
Ï
ÐonIng oIL shoUÑd be pRincIpaLLy kerosene wItÀ a suÒpheR based oILÓ
ADequate filtRaTion shoÂld be provided with both Ôgnetic and paper filteRs
REcoÕended±
Ö Reco×ØÙended MIxtÂre Is
2¶³1/2
paRTs keRosene To
22¸1/2
parts
sÚLpheR based oiL ±
³
Û
ÖfTeR honIngÜ the cylinder bore should be washed wiTh soap and water
aÝ
´6µ
degrees
F²
dried and a light coating of oil appLied±
c±
CylInder'ÈXTeRioR±
¹º»
CooÞInG fins.
StRaighTen bent fins as neaR as possible To Their
oßIgInaÑ spacàng±
ºeplace a cylInder asseMbly when áre than one percent of
bâRRel cooLIng fIn area is broken±
Also replace cylinder asseMbly If head fin
is broken ãoRe Than half tÀe depth of The fin oR More Than two inches ÑongÊ
A
cYLinder assembLy can be used If it has not more TÀan three accepTabLe defectsä
oß If no TWo of The defects are on adjacent fIns±
ºepaiR damaged cylinder head
fins as ouTlined below±
åa)
BleædInçÓ
èse a fine MilL fIle To Remove sharp coRneRs on bRoken
Àéad fIns±
êvëìí ReMovIng ÎoRe ÎeTaL Than necessaRy To pRodÂce a smooThLy
blended edge on The daMaged fin.
(bî
BLeæded fIn dePTh±
²he depth of any blended fIn MUst not be Less
Tïan
µ¼
peRcenð oñ iTs oRògónal depTh±
ôÀen blended fIn Is Less TÀan
50
peõcent
oö oRigInaL dep÷hø õepLace TÀe cyLIndeR asseùbLy
´
¶/´·7
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