DIAL SIDE TRAIN SIDE

Scale 1:1

SpecificationsMovement

BULOVA MODELS

11 AOAC11 AOACBAutomaticAutomatic DateAutomatic Day + Date

11 AOACD

Automatic Mechanism

11y,'"Lever escapement17 or 23 jewelsUnbreakable and self-lubricatedmainspringTotal running time: 42 hoursScrewless, beryllium copper balanceCompensating alloy hairspring21,600 beats per hourAdj ustable stud - holderKIF Elastor shock-resisting deviceInstant date settingDiameter of plate 25.60 mmAngle of lift 46°

The oscillating weight, made of heavy alloy, is mountedon its axle located in the center of the movement and isfree to swing in either direction.Mounted partly on the combined bridge and partly onthe pillar plate, the automatic mechanism transmits thewinding movement from the oscillating weight to thebarrel arbor by means of two reversing gear units, aconnecting wheel for auxiliary reverser, a reduction gear,a driving gear for crown wheel, the crown wheel andthe ratchet wheel.Each reversing gear unit consists of a reversing gear anda reversing gear pinion, the latter being held in positionby a spring. Whichever way the weight turns, onereversing gear meshes with the automatic train while theother slips. In either case, a fairly continuous self-windingaction will follow.Winding can also be done by hand, using the stem andcrown.

Designation of TypesCaliber Description

11 AO11 AOC11 AOCD11 AOAC11 AOACD11 AOACB

Handwound, without secondHandwound, wjth center sweep secondHandwound, with center sweep second and dateAutomatic, with center sweep secondAutomatic, with center sweep second and dateAutomatic, with center sweep second, date and day

Height

3.35 mm3.35 mm3.35 mm4.50 mm4.50 mm5.27 mm

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Characteristics11 AOAC1. In this movement, as in the 11 ANAC

series, the hairspring does notmove freely between the boot andpin of the regulator, but leansagainst the pin. It must continueto do so, even when it is atmaximum open position.

2. The oscillating weight axle is partof the combined bridge. In the rarecase that it might be necessary toreplace it, a new combined bridgeis required.

3. The minute wheel spring (129)and clutch lever spring (26) areriveted to the pillar plate in orderto prevent their loss. They aretherefore part of the pillar plate andnot available separately.

4. The beryllium copper bushing forthe top pivot of the sweep secondwheel is fitted inside the bottompart of the oscillating weight axle.Bulova recommends oiling thisbushing from under the bridge,before fitting the latter.

5. In this movement there are twoidentical setting wheels (29). Thesetting wheel which meshes withthe clutch wheel (17) is fitted withthe bevelled side up.

Disassembling thewatchUncasing

The movement is held in place eitherby two casing clamps (191), or by amovement ring.

Removing the dial and thecalendar mechanism

After removing the hands and releasingthe two lateral dial screws (47), thedial may be removed. The day starwith dial disk (591) can be lifted upand the day and date mechanismsremoved.A dial rest (148) is necessary oncaliber 11 AOACB when fitted with aflat dial, and in other models as theneed arises.

Checking the automaticgear train

By moving the oscillating weight (344)in both directions, the transmissionof power from the oscillating weight(344) to the ratchet wheel (13) can bechecked.

Figure 1Removal of the balance wheel andpallet.

Figure 2Removal of the barrel.

Removing the oscillatingweight

The oscillating weight is held in placeby a gib (343). To remove the weight.unscrew the gib screw (366) andremove the gib.

Releasing the mainspring

With the oscillating weight (344)removed, the mainspring can bereleased as follows:

1. Disengage the click (32), holdingit in disengaged position by meansof a pin or a screw inserted in thehole provided for that purpose inthe barrel bridge.

2. Press with a pointed tool on onearm of the Breguet spring (326)through the hole made in the upperbridge for automatic device (341)and at the same time

3. turn the winding crown 1/4 turnforward, then let it turn slowlybackwards until movement iscompletely run down.

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Cleaning the escapement

As shown in figure 1, the balance andpallet fork are readily removed withoutdisassembling any other parts of themovement.

The mainspring barrel

Figure 2 shows how easily the main-spring barrel (1S) is removed withoutdisassembling the self-windingmechanism.Slipping of the brake spring shouldtake place only after 6 completerevolutions of the barrel arbor. Thiscorresponds to a power reserve of over40 hours.An unbreakable and lifetime lubricatedmainspring is used. Therefore, periodiccleaning of the barrel and mainspringis unnecessary.

Do not dismantle the barrelassembly. In case of difficulty withthe duration of run and if the basicmovement seems to perform normally,check the function of the automaticmechanism. If it is completely free,wi nd it fully by hand and let thepiece run down. If total running timeis less than 35 hours, replace thecomplete barrel assembly (1S).

366 .:»

30B------r

317

317D

~.•.Figure 3The minute wheel spring. The clutch lever spring. The guidemark for loading the clutch lever spring.

"'Figure 4The automatic gear train.

~Figure 5Oiling of the cannon pinion of the large driving wheel.

Reassembling andoiling the watch

9. Install, lubricate and adjust asnecessary pallet and balanceassemblies with bridges.

10. Check that the hairspring pressesagainst the pin (Characteristics11 AOAC, point 1).

11. Fit the oscillating weight (344)and oil its axle and gib (343).

large driving wheel (4F) as shownin figure 5. When setting thehands, the cannon pinion slips onthe axle of the wheel, that is whyit is necessary to make sure thatthe friction (torque) between thecannon pinion and the axle is correct.

2. Install the Breguet spring (326)if removed, the gear train and thecombined bridge (226).NOTE: We recommend oiling thetop pivot of the sweep secondwheel (6K) on the bushing fittedunder the oscillating weight axlebefore fitting the bridge.

3. Install the mainspring barrel andits bridge.

4. Lubricate gear train. If the topbushing for sweep second wheelwas not oiled before fitting thebridge, lubricate through theoscillating weight axle with anappropriate oiler.

5. Lubricate lower bearings of theautomatic train.

6. Lubricate stud of connecting wheelfor auxiliary reverser.

7. Lubricate Breguet teeth of bothreversing gears.NOTE: Before installing bothreverser gear units (317C, 317D),check the Breguet spring (326).Normal loading is reached whenthe two arms of the spring attain3/4 the height of the stud of theconnecting wheel for auxiliaryreverser (317).

8. Install automatic mechanism (asshown in figure 4) and lubricateupper pivots.

Dial side

1. The tension of the clutch leverspring (26) is correct when thespring is tangent to the settinglever (25) side of the guide markmade in the pillar plate (figure 3).

2. The functions of the windingmechanism must be lubricated asusual.

3. The centre pipe (106) requiresno lubricant, for the cannonpinion (94A) must turn freely onthe pipe.

4. Lubricate the pivot of the minutewheel (8) and before fitting thelatter, make sure that the minutewheel spring, which is riveted inthe pillar plate, is properly set,i.e. that it is pressing against thepivot of the minute wheel.

5. After fitting the minute-work cock(9) it is very important to check theendshake and the freedom of thecannon pinion (94A), and to makesure that the minute wheel springis pressing the minute wheel againstthe cannon pinion (94A).

Checking the automaticwinding

Wind up the mainspring six turns.Hold the movement or the watch in avertical plane and turn it slowly roundthe axis of the hands. The oscillatingweight will now wind up the main-spring and it should drop under itsown weight. Malfunction may becaused by excessive tension of theBreguet spring (326) or by frictionelsewhere.

Checking the minutewheel spring

After affixing the dial and hands, it isrecommended to check the functioningof the minute wheel spring bypushing the minute hand slightlyforward (clockwise) with the aid of apegwood stick. Under the tension ofthe spring the minute hand mustalways come back to its originalposition. This is necessary in order toovercome normal backlash in thehands caused by the cannon pinionturning freely on the center pipe.

Train side

1. Before installing the gear train,lubricate the cannon pinion of the

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Oiling recommendedMoebius

1. Winding mechanism 83002. Setting wheel studs 83003. Minute wheel pivot 83004. Cannon pinion of the large

driving wheel (4 F) 80305. Gear train 90106. Barrel arbor 80307. Stud of connecting wheel

for auxiliary reverser (317) 83008. Crown wheel 83009. Breguet teeth of both

reversing gears andpignons (317D/317C) 8300

10. Automatic train 803011. Pallet stones 94112. Balance wheel 901013. Oscillating weight axle and

gib (343) 830014. Stud of intermediate

setting wheel datecorrector (630) 8300

15. Stud of intermediate datewheel (581) 8300

16. Stud of date indicator drivingwheel (574) 8300

17. Stud of intermediate daywheel (609) 8300

18. Nose of click driving the dateindicator (on wheel 574) 8030

19. Function of date jumper (596) 803020. Function of day jumper (586) 8030

NOTE: The cannon pinion (94A)turning on the center pipe (106). thepivots of pallet (57) and the pivotingposts of the day and date jumpers(586 and 596) require no lubri-cation.

Calendar mechanismTypeThere are three possi ble positions ofthe winding stem, that is:1. Winding (innermost)2. Hand setting (intermediate)3. Date correcting (outermost)The date is changed instantly simplyby pulling the crown out from first tothird position.

Disassembling andreassemblingDisassembling and reassembling ofthe day and date mechanisms can bedone without difficulty; however,special attention should be given tothe following points:

1. When fitting the date correctorsetting wheel (631) make sure thatthe beak of the finger is locatedexactly opposite the point "E"indicated on the pillar plate, seefigure 8. One half finger width canbe tolerated on either side ofpoint "E".If the setting wheel (631) cannotbe set within the tolerance indi-cated, turn it through 180'. Ifnecessary, change it or change theintermediate date corrector settingwheel (629).Improper positioning of the datecorrector setting wheel (631)would cause the date indicator (576)

.•.Figure 6The date mechanism (dateindicator guard removed).

"'~Figure 7The day and date mechanism(day mechanism guardremoved).

~Figure 8Correct position of the datecorrector setting wheel (631).

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weight functions normally with nocontact against the back of the case.

2. With crown in intermediate position,turn the hands clockwise to make surethat the day and date indicators jumpcorrectly at approximately 12 o'clockmidnight

3. To check operation of the instantdate setting mechanism: withcrown in innermost position. pullcrown out through intermediate tooutermost position. Date mustadvance.

Setting the day and the date

1. With the crown in the intermediateposition, set the day by turning thehands in either direction untilcorrect day appears In the dialaperture.

2. Set date by moving crown backand forth between the innermostand outermost positions until thecorrect date appears in the aperture.Push crown in.

3. Set the time with the crown in theintermediate position, turning thehands a further 12 hours if thesetting is for P.M.

to advance either two days at atime or not at all, when using thestem to change the date.

2. After having fitted the intermediateday wheel (609, cal. 11 AOACB),turn the calendar mechanism bymeans of winding stem and ensurethat the finger of the date indicatordriving wheel (574) comes be-tween two teeth of the inter-mediate day wheel (609) as indi-cated on figure 7, this to preventthe said finger from butting againsta tooth of the intermediate daywheel (609)

3. To fit the day dial disk (591). presson it lightly and, with the aid of apointed tool through the hole, pullthe day jumper (586) backwards(towards the stem) in order to setit between two teeth of the day star.

4. A dial rest (148) is necessary oncaliber 11 AOACB when fitted witha flat dial, as well as on othermodels as the need arises.

Checking the movementin the case

1. After fitting the movement into thecase, make certain the oscillating

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Parts Index

1S4F

56K7891314161718232425282931323537C37037E3839414444A45C4748515454A54B565758596062A636465C70L70R85A94A

106111112191201203212216226308317

317C3170326334

336337341

343344366

Barrel completeLarge driving wheel withcannon pinionThird wheelSweep second wheelHour wheelMinute wheelMinute work cockRatchet wheelCrown wheelWinding stemClutch wheelWinding pinionStud holderClutch leverSetting leverSetting lever springSetting wheelRatchet click springRatchet clickRegulatorCombined bridge screwSpecial combined bridge screwBarrel bridge screwBalance cock screwPallet bridge screwRatchet wheel screwScrew for setting lever springScrew for minute wheel bridgeCasing clamp screw'Dial screwSetting lever screwHairspring stud screwBalance completeBalance with rollerBalanceBalance staffPallet fork completePallet arborEscape wheelRollerHairspring studMinute handHour handSweep second handExit pallet jewelEntry pallet jewelHairspring colletCannon pinion without clamnotchCenter pipeUpper block KI F Elastor completeLower block KI F Elastor completeCasing clamp'Pillar plate'Barrel bridge'Balance bridge'Pallet bridge'Combined bridge'Reduction gearConnecting wheel forauxiliary reverserReversing gear pinionReversing gearBreguet springScrew for upper bridge ofautomatic deviceScrew for screw gibBreguet spring screwUpper bridge for automaticdeviceScrew gibOscillating weightDriving gear for crown wheel

11 AOAC Parts--;.y;; .... i-_.!{IJ .... -_.!, .._. ___J1. .•~ -..~...

~'

28344571574576577578581588E596629

Setting lever springOscillating weightDate indicator guardDate indicator driving-wheelDate indicatorDate indicator guard screwDate jumper springIntermediate date wheelDate corrector leverDate jumperIntermediate setting wheel ofdate correctorSetting wheel of date correctorJumper for intermediatesetting wheel correctorScrew of the jumper for inter-mediate setting wheel corrector

631633

634

28148344571574576577578581586588E591596609611612613629

631633

634

Setting lever springDial restOscillating weightDate indicator guardDate indicator driving wheelDate indicatorDate indicator guard screwDate jumper springIntermediate date wheelDay jumperDate corrector leverDay star with dial diskDate jumperIntermediate day wheelDay jumper springDay mechanism guardDay mechanism guard screwIntermediate setting wheel ofdate correctorSetting wheel of date correctorJumper for intermediate settingwheel correctorScrew of the jumper for inter-mediate setting wheel corrector

All information contained in thisbulletin is based on the latest productinformation available at the time ofprinting. We reserve the right to makechanges at any time without notice.

11 AOACD Additional or varying parts from 11 AOAC

Scale 1:1 Scale 3: 1

,ft)

574

344

~ G -,. ~ 0-578 581 586 588 E 596

591

* ~ ~ '* ,.---609 611 629 631 633612Scale 1:1 Scale 3.

11 AOACB Additional or varying parts from 11 AOAC

28

NOTE: When ordering dial rest (148), in addition to the caliber please indicate thecase reference.When ordering date indicator (576) and day star with dial disk (591), please indicatethe caliber, the number printed under the disk, the colour and the language.

For complete interchangeability of parts, please refer to the BulovaSpare Parts catalogue.

BULOVA WATCH CO.Documentation TechniquePrinted in Switzerland 1972 - 26000

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