Heritage 1854› Movement Library› Model 108
Service Manual · Heritage 1854

The
Model 108

13 Ligne Self-Wind Calendar · Model 104 Base

The Model 107 with a date. A 13 ligne self-winding calendar movement on the Model 104 base, with a fast change system for setting the date and a date frame assembly in place of the dial rest.

Self-winding Calendar V-Conic Fast Date Change
The Model 108 movement, dial side and movement side
Factory Service Manual · Model 108 · Dial Side & Movement Side
Technical Specifications
Ligne13
BearingsV-Conic
ConstructionTwo plate
WindingPlanetary gear, self-wind
Basic movementModel 104
FeatureFast change system for the date
ManualService Manual · Model 108
Size (mm)29.45 mm
Height6.40 mm
Jewels0
EscapementPin lever
Beat rate18,000 bph
Power reserve38 h
Size in mm, height, jewels, escapement, beat rate and power reserve: ranfft.org

A Date on the Model 107

The Model 108 movement is a 13 ligne self-wind movement featuring the Timex “V-Conic” bearing system, two plate design and a fast change system for setting the date. The Model 108 contains a planetary gear self-winding system. The routine movement of the wrist of a normally active person is sufficient to keep the watch running without manual winding.

Note: The basic movement is similar to the Timex Model 104, and this manual does not repeat its servicing. For cleaning, lubrication and the base reassembly, see the Model 104 guide. The self-winding work is the same as the Model 107; where that calibre has a dial rest, the Model 108 has a date frame assembly.
Timex Model 108, dial side
Dial side
Timex Model 108, movement side
Movement side
Photos courtesy of ranfft.org

Exploded View

Everything below the numbered parts is the basic Model 104 movement.

Model 108 movement, exploded view
Model 108 · Calendar & Self-Wind Parts
Ref.Component
0032Dial
1004Cannon Pinion Assembly
1011Hour Wheel Assembly
1035Screw
1041Hour Wheel Washer
1100Date Ring
1171Hour Hand
1172Minute Hand
1184Sweep Second Hand
1190Rotor Plate Assembly
1192Rotor Plate Screw
1429Date Detent Spring
1500Date Frame Assembly

Disassembly for Cleaning

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

Freeing the Rotor Assembly

1

Remove the case back. Loosen and remove the two rotor plate screws.

2

Lift the rotor assembly slightly to free the dowels.

The two rotor plate screws on the Model 108
Fig. 108.3 · Figure 1, Rotor Plate Screws

Sliding It Out

3

The rocker arm fits between the rotor frame and the rotor assembly. Position the rotor weight as shown and slide the assembly along the movement plate, toward the balance wheel, until it is free of the rocker arm, then lift the assembly out of the case.

Caution: Any attempt to lift the weight before it is free of the rocker arm will result in damage to the movement.
The rotor assembly positioned to clear the rocker arm
Fig. 108.3 · Figure 2, Rotor Assembly

Releasing the Crown and Stem

4

Loosen the set lever screw and raise the lever sufficiently to release the stem, then pull the crown and stem assembly free of the movement and the case.

Note: Some Timex self-wind watches are designed so the movement and dial assembly is removed only through the back of the case. Identify them by removing the case back and checking for a retaining ring on the inside of the bezel instead of the flange shown in figure 1. Where a retaining ring is fitted, do not try to remove the crystal: free the ring from the case groove and take the movement out through the back.
The set lever, set lever screw and crown and stem assembly
Fig. 108.4 · Figure 3, Set Lever

Out of the Case

5

Where there is no retaining ring, turn the assembly over and remove the crystal using a crystal remover. The reflector ring and the movement and dial assembly can then be removed through the front of the bezel.

The crystal, reflector ring, movement and dial assembly, and bezel
Fig. 108.4 · Figure 4, Case

The Dial Tabs

6

Remove all hands. Turn the assembly over and bend the four dial tabs sufficiently to free the dial from the dial rest and the movement.

The four dial tabs and the securing screw
Fig. 108.5 · Figure 5, Dial Tabs

Off the Date Frame

7

Hold the dial in place and turn the assembly over so the dial is up. Carefully lift the dial off the assembly, noting the position of the parts underneath, then lift off the date ring and the date detent spring.

8

Replace the crown and stem assembly in the movement and tighten the set lever screw to assure engagement. Release the mainspring power slowly by holding the crown in the fingers of one hand while the click is held out of engagement with the ratchet wheel, through the hole in the date frame assembly.

9

Turn the assembly over, date frame down, and remove the screw securing the date frame assembly. Turn the assembly over again and lift off the date frame assembly and the ratchet wheel.

10

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

Note: With the above parts removed, the basic movement may be replaced with a Timex reconditioned movement. The parts removed are then assembled to the reconditioned movement.
The dial, date ring, date frame assembly, ratchet wheel and dial plate separated
Fig. 108.5 · Figure 6, Date Frame & Ratchet Wheel

Cleaning

With the above parts removed, the basic movement of the Model 108 may be cleaned and relubricated as outlined for the Model 104 movement. Other metal parts may be cleaned in the same manner as the movement.

Caution: Extreme care must be exercised in cleaning dials and hands. Solvent type cleaners will often damage the finish on these parts.

Reassembly

Greasing the Rotor Frame

•

Apply grease, Moebius special lubricant in the factory, to three points on the rotor frame assembly. Apply grease to the rotor cam at surface A, force grease beneath the rotor staff head at B and to the underside of the rotor cam at C.

The three grease points on the rotor frame assembly
Fig. 108.6 · Figure A, Rotor Frame

Oiling the Slip Tail

•

Assemble the ratchet wheel and date frame and secure with the screw. Rotate the crown until the mainspring and slip tail are positioned as shown, then apply a drop of spreading type oil, Woods AAAA in the factory, in the space between the mainspring and the inside diameter of the barrel, or between the slip tail and the barrel, through the opening in the date frame.

•

Rotate the crown so the mainspring and slip tail make two complete revolutions within the barrel to distribute the oil properly. Release the mainspring power slowly, then remove the screw, date frame and ratchet wheel.

The mainspring and slip tail positioned for oiling
Fig. 108.6 · Figure B, Slip Tail

The Main Arbor and Ratchet Wheel

C

Place spreading type watch oil on the main arbor flat on one side, permitting oil to contact the root of the planet wind pinion teeth. From this point drag the oiler over the top of the planet wind pinion down to the main arbor flat on the opposite side, then apply spreading type oil to the bearing surface between the barrel hub and the movement plate.

D

Apply non-spreading type oil, Moebius Synt-A-Lube in the factory, to six points on the ratchet wheel and planet pinion assembly.

Oil points on the main arbor and the ratchet wheel and planet pinion assembly
Fig. 108.7 · Figures C and D

The Rocker Arm and Winding Ratchet Wheel

E

Apply non-spreading type oil to four points on the rocker arm assembly and winding ratchet wheel.

The four oil points on the rocker arm assembly and winding ratchet wheel
Fig. 108.7 · Figure E

The Date Detent Spring

•

Insert the date detent spring into the date frame assembly as shown, then lubricate its bearing face with a thin film of non-spreading watch oil where shown.

Caution: Avoid excess lubrication, and do NOT lubricate the date wheel area.
Oiling the bearing face of the date detent spring
Fig. 108.8 · Date Detent Spring

The Cannon Pinion

•

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

Oiling the end of the cannon pinion
Fig. 108.8 · Cannon Pinion

Replace the parts on the movement in this order: cannon pinion assembly, hour wheel assembly, hour wheel washer, then the ratchet wheel, making sure it is seated and properly engaged with the click and the rocking bar assembly. Orient the date frame assembly with the slot at the stem and seat the bosses in the holes, turn the assembly over so the date frame is down, then insert and tighten the screw.

Dropping In the Date Ring

•

Position the date ring centrally on the 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. 108.9 · Date Ring

Orient the dial with the window toward the crown and stem assembly and insert the dial tabs through the holes in the date frame assembly. Hold the dial in position on the movement, turn the assembly over and bend the tabs firmly over the edge of the dial plate. Pull the crown and stem out and rotate to turn the hands clockwise until the date changes with a snap, stop turning, and assemble the hands at the 12 o’clock position.

Checking the Change

1

Turn the crown so the hands rotate clockwise until the date advances one position. This should occur about midnight.

2

Rotate the hands counterclockwise to 9, then clockwise until the date advances again.

3

Rotate the hands clockwise through 24 hours and the date should advance one position.

Then: loosen the set lever screw and remove the crown and stem. Position the dial and movement assembly in the bezel, insert the reflector ring and replace the crystal, then insert the crown and stem assembly through the bezel and into the movement and retighten the set lever screw. Reassemble the rotor assembly by sliding it under the rocker arm, notch in the rotor frame towards the balance assembly, and secure with the two screws. Position the case back so the crown is to the left when the words are upright, then recheck the watch for proper function of the date setting mechanism.