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This is a generic jumping hour click spring for the Rolex Caliber 3186 movement, part number 3186-657-1. This spring is a critical component of the independent GMT jumping hour mechanism, providing distinct detent feel and positioning force when adjusting the GMT hand, ensuring the independent hour hand jumps precisely in one‑hour increments. Replacing the original spring when it becomes fatigued, deformed, or broken restores smooth adjustment feel and accurate jumping of the GMT hand.
Generic Replacement – Designed for Rolex Caliber 3186; non‑original but matches OEM dimensions and tension.
Jumping Hour Core – Provides detent feel and positioning force for the independent GMT hand, enabling crisp one‑hour jumps.
Precision Manufactured – Made of quality spring steel for stable tension and fatigue resistance.
Essential for Service – Replace when GMT hand adjustment feels vague, jumps inconsistently, or fails to hold position.
Direct Replacement – Same mounting as the original; no modification required.
| Parameter | Details |
|---|---|
| Part Name | Jumping Hour Click Spring |
| Part Number | Rolex 3186-657-1 |
| Compatible Movement | Rolex Caliber 3186 (GMT‑Master II, e.g., 116710LN) |
| Material | Spring steel |
| Function | Provides detent and positioning force for the independent jumping GMT hand |
Rolex Caliber 3186 automatic (GMT‑Master II references such as 116710LN, 116713LN, 116718LN).
Repair of abnormal GMT hand adjustment feel (no jump, vague jump, or incorrect jump angle).
Replacement of aged, deformed, or broken jumping hour click springs during movement service.
1. Is this a genuine Rolex jumping hour spring?
No. It is a generic aftermarket replacement, not original, but matches the OEM dimensions and tension.
2. What are the symptoms of a damaged jumping hour spring?
Typical symptoms: when the crown is pulled to position 2 to adjust the GMT hand, there is no distinct click feel; the hand may spin freely or jump inaccurately.
3. What should I pay attention to during installation?
The spring is tiny. Use fine tweezers to place it correctly, ensuring the spring leg engages the locating hole and the spring arm contacts the jumping cam properly. Follow the Rolex technical guide. Professional installation is strongly recommended.
4. Does this spring fit Caliber 3185 or 3187?
No. Caliber 3185 has a different jumping hour mechanism. Caliber 3187 (Explorer II 216570) also uses a different design. Do not mix.
5. Does the new spring require lubrication?
No separate lubrication is needed, but a tiny amount of dedicated grease may be applied to contact points (e.g., spring leg and cam) to reduce wear and ensure smooth operation. Refer to the Rolex technical guide.
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