The function of a dial washer is to prevent the hour wheel from rising and disengaging from the pinion on the minute wheel that drives the hour wheel.

The dial washer is also critical for keeping the hour wheel in place when the watch is turned over into the dial down position.

Typical style dial washer

Sometimes the minute hand sits close enough to the pipe on the hour wheel and suffices to stop the hour wheel from rising.

Watches with curved dials on which there is an exaggerated gap between the hour wheel and the back of the dial should have a dial washer or sometimes two — one with the convex side up, the other with the concave side down.

Dial washer shown in place on hour wheel

To test the dial washer, once the dial is on the watch try lifting the hour wheel. If the dial washer is working properly, the hour wheel will snap back down into proper position.

The dial washer should be the proper size so that it can’t move to one side and get caught between the teeth on the hour wheel and the minute wheel pinion. If the watch uses a single washer, you can place it any way that you wish. I generally put them in concave side up.

Hour wheel shown centered in opening in dial

On some watches a dial washer is not needed. On these 2 Rolex models, the date wheel holds the hour wheel in proper position.

Rolex 3135 shows date wheel that will hold the hour wheel in proper position.
Ladies Rolex shows the date ring that will hold the hour wheel in position

It depends on the age of the watch and the amount of play in the hour wheel against the cannon pinion.

On some watches, notably pocket watches there can be quite a bit of play between the two. Not only does the dial washer hold the hour wheel down it also helps to keep the hands in a parallel plane, so as the hands on the watch go around they don’t get hung up on one another. 

Picture shows the hour and minute hands of a pocket watch held in proper position because of a dial washer.

Mark Sirianni
25 Fraley St.
Kane, PA. 16735
watchdoctorpa@gmail.com
1-814-558-4818 Cell
1-814-837-9435