The following information was kindly scanned and OCR’d for me by Rohit. If you need your vintage Timex repairing but don’t have the time or skills needed please look him up.
The official Timex document can be downloaded as a PDF from here.
Calendar Watch [25.1]
The Timex Model 25 is on 11 ¼’” x 9\t4″‘ calendar movement utilizing the basic construction of the Model 24. Like the Model 24 it features a “V-Conic” Bearing system and rugged two plate design. The entire Calendar mechanism is efficiently housed between the dial plate and dial.
Whereas most watches utilize bridges, TIMEX has constructed the Model 25 movement with full plates to take advantage of the accuracy inherent in this type of design. This accuracy insures complete interchangeability for the escapement and gear train without the need for selective fitting and adjustments which complicate the repair of most watches.
To clean the TIMEX Model 25 it is necessary to remove only the sweep second hand, dial, dote ring, date wheel assembly, ratchet wheel, and balance. The illustrations on pages 25.3 through 25.5 show proper procedures. TIMEX has found through long and careful research that the best method of cleaning is with only the above mentioned parts removed. The cleaning fluid, while removing any contamination from the movement will also remove oil from the gear train, pivots and holes.
If further dismantling is required, removal of the movement plate will expose the gear train and associated parts. Re-assembly should start with the dial plate, exercising normal care to insure proper positioning of pivots in their respective holes. The exploded view of the movement on page 25.2 will guide re-assembly.
Cleaning and re-oiling instructions for the Model 25 movement are given on page 25.6. Re-assembly techniques are shown on page 25.7 and 25.8
The TlMEX model 25 movement (exploded view) [25.2]
100 – DIAL PLATE ASS’Y.
118 – MOVEMENT PLATE ASS’Y.
180/1 – BARREL ASS’Y.
201/1 – 2 ND. WHEEL ASS’Y.
210 – 3 RD. WHEEL ASS”Y.
227 – 4 TH. WHEEL ASS’Y.
242 – CANNON PINION ASS’Y.
260 – MINUTE WHEEL ASS’Y.
401/1 – CROWN a STEM ASS’Y.
416 – RATCHET WHEEL
423/1 – ROCKING BAR BUSHING
437 – ROCKING BAR ASS’Y.
443 – SET LEVER
450 – INTERMEDIATE WIND PINION
450/1 – WINDING STEM PINION
452 – WIND a SET PINION
495 – RATCHET WHEEL WASHER
495/2 – WINDING BRIDGE
498/1 – HOUR WHEEL WASHER
705 – ESCAPE WHEEL ASS’Y.
710 – PALLET LEVER ASS’Y.
721 – BALANCE ASS’Y.
740 – HAIRSPRING WEDGE PIN
751 – DIALS DIAL HOLDER
850 – HOUR HAND
851 – MINUTE HAND
852/1 – SWEEP SECOND HAND
2556 – DATE WHEEL ASS ‘Y.
2557/1 – DATE RING
2558 – HOUR WHEEL
2576 – DETENT SPRING
5100 – PILLAR SCREW
5443 – SET LEVER SCREW
Disassembly of Movement for Cleaning ( model 25) [25.3]
Removing the dial, date ring and hands.
a) Remove sweep second hand. Do not remove the minute or hour hand.
b) The dial holder, to which the dial is clamped is held on the movement by means of three tabs which are bent through dial holes, onto the dial plate.
c) Once the dial is off the movement, the date ring can be removed. There is no need for further dis assembly of the dial assembly for cleaning unless severe contamination is present on the friction and cannon pinions. Should further disassembly be necessary, removal of the minute hand will free the friction and cannon pinion assembly. The friction pinion is held in the cannon pinion by a snap tit.
Disassembly of Movement for Cleaning Cont’d. [25.4]
Removing the Date Wheel and Ratchet Wheel
ASSEMBLY The next step in preparing the movement for cleaning should be the removal of the date wheel and ratchet wheel. Proceed as follows:
a) Remove the date wheel.
b) Grasp the crown with the fingers of one hand and release the click by holding the click away from the ratchet wheel. Let the crown revolve slowly in the fingers being careful not to let the crown slip.
c) When the mainspring has been fully let down, remove the ratchet wheel washer and ratchet wheel. Note: Ta remove the ratchet wheel washer, lift one side free of the lancing in the ratchet wheel and revolve t h e washer approximately ¼ turn.
Removing the Crown and Stem
To remove the crown and stem assembly, invert the movement so that the movement plate is facing you. Turn the set lever screw approximately one turn and lift the tail of the set lever out of engagement with the stem. The crown and stem can now be removed.
Disassembly of Movement for Cleaning Cont’d. [24.5]
Removing the Balance Wheel
Two “V-conic” studs ore used as bearings for the balance staff on the TIMEX Model 25 movement. The bearing on the dial plate is mounted in a screw so that fine endshake adjustment is possible.
Removal of the balance wheel assembly should be carried out in the fol lowing manner:
a) Remove the hairspring wedge pin, being careful not to distort either the pin or the hairspring.
b) Rotate the balance wheel slowly until the hairspring toil is free of the hairspring wedge pin bracket and the regulator.
c) Loosen the balance screw assembly (counter-clockwise direction) using a suitable screw driver, until the end of the balance staff is free of the “V-conic” bearing. During the loosening of the screw, only minimum downward pressure should be applied with the screw driver, as excessive downward pressure could seriously damage the balance staff points.
d) Carefully remove the balance assembly.
Cleaning the Model 25 Movement [25.6]
After removal of the balance wheel, and the other ports mentioned on Pages 25.3 through 25.5, the movement is ready to be cleaned.
If a cleaning machine is used, place the movement in the basket with the dial plate down to insure proper drainage of the fluid from the mainspring barrel. It should be well swirled in the cleaning fluid after which two sets of rinsing fluid should be used. The final cleaning fluid must be absolutely clean. After cleaning, the movement should be thoroughly dried.
If a cleaning machine is not available, the some procedure should be followed manually, by re-inserting the stem into the movement, grasping the movement firmly around the stem and shaking it in the cleaning and rinsing fluids to insure that the fluid will poss through the entire mechanism.
The balance assembly should be cleaned separately in a small jar to prevent damage to the hairspring.
Only standard watch cleaning solutions should be used throughout.
Lubricating the Model 25 Movement
The movement should be re-oiled in the normal manner using only high grade watch oils (oil used in factory assembly is Elgin M56b). The mainspring is permanently lubricated with a solid coating which is not affected by normal cleaning solutions and should, therefore, not be oiled.
The upper pivot of the escape wheel con be oiled through the holes in the
·minute wheel.
The “V-conic” bearings should be oiled ½ to ¾ full before replacing the balance wheel.
Oil both the top and bottom sides of the intermediate wind pinion and wind and set pinions.
OiI the intersection of the rocking bar and set lever.
A slot hos been provided at the base of the center post to facilitate oiling the fourth pinion upper pivot.
If the friction pinion hos been removed from the cannon pinion and cleaned, oil the friction pinion before re-assembly into the cannon pinion. The impulse pin should be oiled at its working surface.
Rubber gaskets used on crowns, such as the type used on waterproof and dust proof models, should be lubricated with silicone grease or silicone oil.
Reassembly of the Model 25 Movement [25.7]
Replace the balance wheel carefully into the movement by tilting the wheel and inserting first, the dial side pivot ( hairspring side) then, the movement side pivot into the “V conic bearing”. Adjust the balance screw enough to hold the balance in place. By rotating the balance wheel, insert the hairspring into the regulator slot and hairspring wedge pin bracket. Before re-pinning the hairspring, make certain the impulse pin is within the slat in the fork of the Pallet Lever. Re-pin the hairspring making sure that the wedge pin is straight and true, as any distortion ta the pin could interfere with the normal “breathing” of the hairspring. The endshake is now finally adjusted using caution to apply only minimum downward pressure to the balance screw, as excessive pressure could damage the points of the balance staff.
Inspect the hairspring to be certain that it is properly adjusted. As shown by the diagram, the hairspring should be in light, permanent contact with the inside edge of the regulator slot. The hairspring should not leave the inside edge of the regulator slot at any time during the complete maxi mum oscillation of the balance.
Reassembly of the Model 25 Movement [25.8]
Use the following procedures in re assembling the date mechanism.
a) Replace date wheel assembly on the movement.
Note: Date wheel must be re placed with large head of bushing toward dial (refer to illustrations on page 25.4)
bl Assemble date ring to the movement making sure that the “Y” shaped end of the detent spring is positioned in the space between two teeth of the date ring.
- Rotate the date wheel assembly clockwise so that the indexing pin touches the exit side of the date ring tooth.
- Position dial assembly to movement with hands set at approximately 2 o’clock. Then bend the lugs on the dial holder to clamp the dial to movement. It is essential that the dial be clamped tight to the movement. Take care that the position of the hands, date ring and date wheel assembly are not changed during this operation.
- Once the dial is clamped to the movement, the action of the date indexing can be checked. Indexing should start between the hours of 11 and 1 2. Also, the date ring, during the indexing and near completion of its travel, must indicate a “snapping effect” (darts forward) of date numeral to its position in the date window.
If the minute hand has been re moved, replace it on the dial assembly• together with the friction and cannon pinions before the dial assembly is put on the movement.
Replace the sweep second hand by driving it just below the end of the sweep second staff as shown in the diagram. Be certain the sweep hand is set below the chamfer on the top of the staff.