Heritage 1854› Movement Library› Model 102
Service Manual · Heritage 1854

The
Model 102

9½ Ligne Day & Date · Model 100 Base

A 9½ ligne day and date movement, the Model 100 with the day and date mechanism added. The date may be advanced quickly, and the day disc drops onto the frame over a detent spring.

Hand-wound Day & Date V-Conic Quick Date Advance
The Model 102 movement, dial side and movement side
Factory Service Manual · Model 102 · Dial Side & Movement Side
Technical Specifications
Ligne9½
Diameter21.44 mm
BearingsV-Conic
Basic movementModel 100
FeatureQuick date advance
ManualService Manual · Model 102

Day and Date on the Model 100

The Timex Model 102 is a 9½ ligne day and date movement with “V-Conic” balance bearings. The Model 102 movement is the same as the Model 100 with the addition of the day and date mechanism. The date may be advanced quickly.

Note: The movement underneath is the Model 100 and this manual does not repeat its servicing. For disassembly, cleaning, lubrication and reassembly of the base movement, see the Model 100 guide. The calendar half is the Model 101 with a day disc and a second detent spring added.
Timex Model 102, movement
Photo courtesy of 17jewels.info

Exploded View

Everything below the numbered parts is the basic Model 100 movement.

Model 102 movement, exploded view
Model 102 · Day & Date Parts
Ref.Component
242Cannon Pinion Assembly
255Hour Wheel Assembly
498/1Hour Wheel Washer
751Dial
760Day Disc
850Hour Hand
851Minute Hand
852/1Sweep Second Hand
2557/1Date Ring
2561/1Day / Date Frame Assembly
2573Day Detent Spring
2576Date Detent Spring

Disassembly for Cleaning

Getting the movement out of its case first? Case types and dust seals

Lifting Off the Day and Date

A

Remove all hands.

B

Straighten the dial tabs so they will pass through the holes. Turn the assembly over and lift off the dial, the day disc, the date ring and the day-date frame assembly.

C

Remove the hour wheel washer (A), hour wheel assembly (B) and cannon pinion assembly (C) from the movement.

D

After the above parts have been removed, the basic movement can be disassembled, cleaned, lubricated and reassembled as outlined for the Model 100 movement.

E

The hour wheel washer, hour wheel assembly, cannon pinion assembly and day-date frame assembly may be cleaned using standard watch cleaning solutions.

Caution: Extreme care must be exercised in cleaning dials, hands, day discs and date rings. Solvent type cleaners will often damage the finish on these parts.
The Model 102 dial, day disc, date ring and day-date frame lifted off the movement
Fig. 102.3 · Day & Date Stack

Reassembly

The Detent Springs

A

Make certain the day detent spring and the date detent spring are correctly located in the day-date frame assembly.

B

Lubricate the bearing face of the day detent spring and the date detent spring with a thin film of non-spreading watch oil, Moebius Synt-A-Lube in the factory. Lubricate the vertical wall of the day-date frame with a thin film of spreading type watch oil, Woods AAAA in the factory.

Caution: Avoid excess lubrication, and do NOT lubricate the date wheel area.
Oil points on the day and date detent springs and the vertical wall of the day-date frame
Fig. 102.4 · Figure 1, Detent Springs

The Cannon Pinion

•

Apply non-spreading watch oil to the end of the cannon pinion assembly.

Oiling the end of the cannon pinion assembly
Fig. 102.4 · Figure 2, Cannon Pinion

Replace the parts on the movement in this order: cannon pinion assembly, hour wheel assembly, hour wheel washer, then the day-date frame assembly, oriented as shown on page 102.3 with the bosses seated in the holes.

The Day Disc

•

Note the protrusions on the back of the disc. Place the disc on the day-date frame assembly with any day, Sunday for instance, in line with the crown and stem.

The underside of the day disc, showing its protrusions
Fig. 102.5 · Figure 3, Bottom of Day Disc

Fitting the Day Disc

•

With a fine tweezer, deflect the day detent spring outward until the day disc drops into place.

Deflecting the day detent spring with a tweezer to seat the day disc
Fig. 102.5 · Figure 4, Fitting the Day Disc

The Date Ring

•

Position the date ring centrally on the day-date frame assembly. With a fine tweezer, deflect the date detent spring inward until the date ring drops into place.

Deflecting the date detent spring with a tweezer to seat the date ring
Fig. 102.5 · Figure 5, Date Ring

Orient the dial as shown on page 102.3 with the windows toward the crown and stem and insert the tabs through the day-date frame assembly into the dial plate of the movement. Hold the dial in place on the movement, turn the assembly over and bend the tabs firmly against the back of the dial plate.

Pull the crown and stem out and rotate clockwise until the date changes with a snap. Stop turning the crown immediately and assemble the hands at the 12 o’clock position.

Checking the Change

1

The date should change at 12 o’clock.

2

The day change should be completed by 3:30.