Daytona running indefinitely?

[Porsche91101]

can you leave chrono second hand running all the time and screw back the pushers to ensure water resistance? or does the pusher need to be unscrewed for it to run? Thanks!

[kritameth]

Y. N.

[padi56]

Originally Posted by Porsche91101

can you leave chrono second hand running all the time and screw back the pushers to ensure water resistance? or does the pusher need to be unscrewed for it to run? Thanks!

You might lose a few hours of power reserve with the crono function running continuously,and screwvdown pushers have nothing to do with any W/R all they are for is to stop activating the chrono when not needed to time something.

[jamesgames]

the screwdown just prevents you from pushing again, helpful esp underwater. They can be screwed down while the chrono second hand is running.

[garyk]

That's one I've never explored?!

[Tools]

Originally Posted by Porsche91101

can you leave chrono second hand running all the time and screw back the pushers to ensure water resistance? or does the pusher need to be unscrewed for it to run? Thanks!

You can if you want, but it serves no useful purpose.

As mentioned, adding the chrono into the work-cycle will draw down the power reserve a bit and slightly alter timing - you don't get something for nothing in physics.

Also, as mentioned, the screwdowns are lock-nuts only; no affect on water resistance at all, they simply keep them from being pushed while under water..

[LarryB]

I have a 116520 and notice whenever running the chrono second hand the watch will stop keeping time in the middle of the night when I am not wearing it. I typically wear it all day and take off before bedtime.

It would be nice if it could run all of the time.

[Edwardfry3]

You can leave the chronograph second hand running all the time, but it's important to ensure that the pushers are properly screwed down to maintain water resistance.

[cornerstore]

I’ve tried it a few times and I find it seems to slow the watch down outside of normal plus or minus.

[Calatrava r]

'Since 1965, screw-down pushers have gradually replaced the non-screw-down versions of the original models, helping to further reinforce the waterproofness of the case.'

This is from the Rolex website. If you intend to keep the chrono running in water, I would tighten the screw down pushers as you suggested.

[77T]

I believe Rolex's website left out a phrase that would have illuminated how screw down pushers "reinforce" water resistance.

The phrase "by avoiding activation of the pusher in water" helps non-WIS understand better.


Sent from my iPhone using Tapatalk Pro

[mpkRolex]

Originally Posted by Tools

You can if you want, but it serves no useful purpose.

As mentioned, adding the chrono into the work-cycle will draw down the power reserve a bit and slightly alter timing - you don't get something for nothing in physics.

Also, as mentioned, the screwdowns are lock-nuts only; no affect on water resistance at all, they simply keep them from being pushed while under water..

Thanks as I was looking for this answer as well

[mpkRolex]

Originally Posted by LarryB

I have a 116520 and notice whenever running the chrono second hand the watch will stop keeping time in the middle of the night when I am not wearing it. I typically wear it all day and take off before bedtime.

It would be nice if it could run all of the time.

I had left them running last night so in total for about 14-15 hours and the watch was still running. I think the 72 hours reserve helped. I wear like you just during the day time.

[fabR]

Was told to me from a Rolex technician better not , reason why the system can be worn-out easily
i m just repeating

[Tools]

Originally Posted by fabR

Was told to me from a Rolex technician better not , reason why the system can be worn-out easily
i m just repeating

This is actually true for some chronographs. The chrono on some is an add-on module and isn't designed into the overall lube/geartrain operation.

The Daytona is a ground-up integrated chronograph design and the chrono part gets the same lube and mechanical integrity as the rest of the movement.

[Henrimontgomery]

Do what you want, life is meant to be enjoyed.

As other said, you’re going to use more energy and then see the watch lose accuracy/reserve faster than otherwise.

[fabR]

good poin
thanks Tools

[padi56]

Originally Posted by Edwardfry3

You can leave the chronograph second hand running all the time, but it's important to ensure that the pushers are properly screwed down to maintain water resistance.

Why dont you read the thread before you reply the pushers have nothing to do with W/R

[subtona]

Thought you had discovered a perpetual perpetual.

Modern Daytona in house 4130, you may leave running.
Not so for zenith movement.

[Calatrava r]

"Screwed-down position (crown in
position 0, pushers screwed down)
The crown and pushers are completely
screwed down against the case.
When the crown and pushers are in
this position, the Oyster Perpetual
Cosmograph Daytona is guaranteed
waterproof to a depth of 100 metres
(330 feet)." From the Rolex website.

I have no idea why so many people think the screw down pushers on the Daytona are just to prevent accidental activation when the Rolex website explicitly and clearly states the watch is guaranteed WR to 100 meters when they are completely screwed down. Particularly when the crown systems all work optimally WR resistance wise when they are fully screwed down. Given the pressure needed to push the activators and reset, accidental activation is unlikely in any event and not a good sole reason for the dysfunctional cumbersome screw down pushers.

[SearChart]

Originally Posted by Tools

This is actually true for some chronographs. The chrono on some is an add-on module and isn't designed into the overall lube/geartrain operation.

The Daytona is a ground-up integrated chronograph design and the chrono part gets the same lube and mechanical integrity as the rest of the movement.

I'm sorry Larry but that simply isn't true. Only the vertical clutch and the seconds wheel counter get lubricated, the minute and hour counters run dry and will accumulate more wear and potentially shorten the service interval when running indefinitely.

[CaptT]

Originally Posted by Tools

You can if you want, but it serves no useful purpose.

As mentioned, adding the chrono into the work-cycle will draw down the power reserve a bit and slightly alter timing - you don't get something for nothing in physics.

Also, as mentioned, the screwdowns are lock-nuts only; no affect on water resistance at all, they simply keep them from being pushed while under water..

I may have missed it within this thread or others in the past, but out of curiosity, is it possible that the actual pushing of the chrono buttons/pushers is the thing that could compromise water resistance, hence the recommendation to keep them locked when in water? And that in a static/stationary position, the fact that the chrono pusher isn’t screwed down will have little/no impact on water resistance?

[Tools]

Originally Posted by SearChart

I'm sorry Larry but that simply isn't true. Only the vertical clutch and the seconds wheel counter get lubricated, the minute and hour counters run dry and will accumulate more wear and potentially shorten the service interval when running indefinitely.

Thanks.. Always looking for knowledge.

So, in this context we can run the chrono all of the time, but we will likely put unnecessary wear on these sub-counters reducing the service interval needs for these parts.

[SearChart]

Originally Posted by Tools

Thanks.. Always looking for knowledge.

So, in this context we can run the chrono all of the time, but we will likely put unnecessary wear on these sub-counters reducing the service interval needs for these parts.

Correct

It's not dramatic, only a few extra parts that would wear and are included in official Rolex service prices anyway.
So if one wants to let it run all the time, fine, it's not going to be destroying anything. But I myself just don't see the need to do that.

[Tools]

Originally Posted by CaptT

I may have missed it within this thread or others in the past, but out of curiosity, is it possible that the actual pushing of the chrono buttons/pushers is the thing that could compromise water resistance, hence the recommendation to keep them locked when in water? And that in a static/stationary position, the fact that the chrono pusher isn’t screwed down will have little/no impact on water resistance?

Yes.

The pushers have a single o-ring on the stem for water resistance. Pushing the pusher can deform that o-ring slightly, allowing water to get past at depths enough to put positive pressure against them.

[Calatrava r]

Originally Posted by CaptT

I may have missed it within this thread or others in the past, but out of curiosity, is it possible that the actual pushing of the chrono buttons/pushers is the thing that could compromise water resistance, hence the recommendation to keep them locked when in water? And that in a static/stationary position, the fact that the chrono pusher isn’t screwed down will have little/no impact on water resistance?

Most chronograph manufacturers advise not to activate the pushers under water, but I am sure if you look you will find several watches which can be activated under the water per the manufacturer. Rolex does not advise to do so and specifically says they must be screwed down for warranty coverage. The screw down pusher is basically just an O ring which is different from the Rolex crown designs. What anybody can surmise about the screw down pushers is when they are fully screwed down, they create a metallic shell over the seals of the pushers resulting in less water pressure directly on the seals and reduced water intrusion should the seals fail. While the underlying seals in the pushers may by themselves protect up to 100 WR, Rolex, apparently is not comfortable having these seals directly exposed to the WR.