DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 19 of 1422
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DMWR 9Ê2815Ë220
1-5.
(Cont±
equipped with an oIl cooled generator.
THe AVDS²³790²20, AV´Sµ³790²2´A¶ and
AV´S²³790·2DR engines are equipped with an air cooLed generator¸
¹a)
ModeLs AVDS²³790²2º and AVDS·»790·2ºA enGine ¼enerator.
½he Models
AVDS²179¾·2C and ¿V´SÀ»7Á0²2CA engines are equipped with a 28 voLt oil cooLed
dE generator capabLe of 650 ampere
Â
output over the engÃne's operating rÄngeÅ
Æhis generator develops an aLteÇÈating current which is rectified withiN the
uNit to produce a dIrect cUrÉent at tHe output terminalsÊ
¹b)
ModeLs AV´S˳790Ë2ÌÍ AV´S²³79¾²2ÎAÏ and AVOS²»790Ð2´R enÑInÒ
Óenerator.
T
ÔodeLs AV´S²³790²20Õ AV´Sл790²2DA and AV´Sг790²2´R engines use
a
Ì
voÖt air cooled d× generator capable of developing 300 ampere outpØtÅ
ºooLÙ
ing air is drawn frÚ the crew cÛparÜment via an air intake tube by a BlÝer
Þ
Ôounted on the generator.
½he intake tube extends aLong the cranKcase BelÝ the
intaKe manifoLd on tHe right side of the engine.
ßxHaust air is conveyed from the
generator by an air exHaust tube elbow connected to tHe rear of the engine sHroud.
à nerator outlet air is exHausted tHrougH tHe engineás rear cooling fan vane.
(5)
ßâãine Starterä
½He engines are eQuIpped WItH a 24 voLt soLenoId
operated starterä
å loW voltage sensing ÔoduLe Is included to prevent starter
æn wIth improperly cHarged batteriesä
/c1 vAft-
±6²
ßnGine lubrication sYstem.
çngine lubrication is provided by a force
feed systeÔ consèsténg of four circuits.
½Hese are the scavenge circuItÕ the
êin or pressUre oIl circuitë the leveling cIrcuitì and the íaKe up circuit.
çach cIrcuit Is operated IndependentLy by a singLe oil pîp consisting of four
separate sections.
¹ï±
çnGine cranKcase breatHer sðstem.
½he engine cranKcase is vented by an
enclosed breatñer systeÔ WHIcH is vented tHrougH tHe crankcase breather tube at
tHe Left tòrbosópercHarger exhaust pipe.
¹ô)
ßnGine Ôanifold heater sõsteÔä
½he engines are equipped witH two
iötaKe manifold heaters that are ÷østalled beÜween the intaKe ùanifold elbows
and tHe turbosuperchargers¸
½Heú ûüeatersë wHen operatedý preheat air entering tHe
cyþinders to facIþitate coLd weather starting and idle operations.
ä
³
´ ,
¹ÿ)
SÔoke ĀeneratiāÑ sðsteĂä
½He engine Is eQuIpped witH a smoKe generă
1
ating systeÔ wHècĄ can be Used to spray vaporized dIeseL fuelý frą the veHicleĆs
µ
JU,
fueL tanKsć dIrectLy Into tHe engine exHaust systeÔ¸
½his creates a dense smoKe
screen to conceal tHe vehicLe's Location and moveĈnts.
c.
´etailed DescriPtionä
¹³±
ºrankcase.
½He crankcase is a oneĉpiece aluĊinum casting WitH forged
aluminuĂ Ôain bearing caps.
ċHe bearIng caps functIon as an integraČ part of tHe
crankcaseä
çacH cap is secUred on stUds With four slotted nuts.
čwo tHru bolts
claĂp tHe Ôain bearing cap in the tunneL slot of the cranKcase.
ĎitH tHis type
of craâKcase and bearďng cap constrUctionë UâiforĂ Load distribution iâ tHe bearĐ
Ing aređ Is obtained ĂaKing possIbLe uniform distrIbUtIon of cĒēbustioâ Forces
over tHe entire cranKcase.
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