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This is a generic bezel gasket designed for the Rolex Sea-Dweller Deepsea 116660, a high-performance diver‘s watch rated to 3,900 meters (12,800 feet) . Made from durable nylon, this O-ring gasket sits between the rotating bezel and the case, providing a watertight seal and the correct rotational friction for the unidirectional bezel. As a single-use component, it must be replaced whenever the bezel is removed to maintain the watch‘s extreme depth rating and crisp bezel action .
About the Rolex Sea-Dweller Deepsea 116660
The Rolex Sea-Dweller Deepsea reference 116660 is a professional-grade diver‘s watch with exceptional specifications:
| Specification | Details |
|---|---|
| Reference | 116660 (Deepsea) |
| Case diameter | 44 mm |
| Water resistance | 3,900m / 12,800ft |
| Bezel | Ceramic (Cerachrom) unidirectional 60-minute |
| Crystal | Sapphire (5.5mm thick) |
| Movement | Caliber 3135 |
The bezel gasket is installed between the rotating bezel assembly and the watch case. It serves two critical functions:
Water resistance: Creates a watertight seal preventing moisture ingress
Bezel rotation control: Provides the correct friction for smooth, unidirectional bezel rotation with distinct clicks
When to Replace:
Whenever the bezel is removed for service or repair – gaskets are single-use components
If the bezel rotation becomes loose, gritty, or has excessive play
If water resistance is compromised (e.g., fogging under the crystal)
As part of regular maintenance every 5-10 years
Proper Handling:
Keep clean: Before installation, ensure the gasket and gasket channel are free of dirt, sand, or old grease
Inspect: Check for any cracks, deformation, or flat spots on the old gasket
Do not stretch: Avoid over-stretching the O-ring during installation
Single use: Always use a new gasket – never reuse an old gasket
Signs of Gasket Failure:
Bezel feels loose or wobbles
Bezel rotation is gritty or uneven
Visible gaps between bezel and case
Water condensation inside the watch
CRITICAL WARNING: The Rolex Sea-Dweller Deepsea 116660 is designed for 3,900m water resistance. Bezel and gasket replacement requires specialized tools and expertise. Improper installation can compromise the watch‘s water resistance and potentially cause catastrophic failure at depth.
Tools Required:
Bezel removal tool (specific for ceramic Deepsea bezel)
Crystal press with appropriate dies
Case holder
Non-metallic tweezers
Silicone grease (for gasket lubrication)
Rodico cleaning putty
Lint-free cloth
Water resistance testing equipment
Step-by-Step Installation:
Step 1: Remove the Bezel Assembly
Use a specialized bezel removal tool to carefully lift the entire bezel assembly from the case
Work on a soft surface to prevent damage
The bezel is held by spring tension and a retaining ring
Step 2: Remove the Old Gasket
Remove the old compressed gasket from the case recess
Clean the gasket channel thoroughly using Rodico and isopropyl alcohol
Remove all old grease, dirt, and debris
Inspect the case and bezel for damage
Step 3: Prepare the New Gasket
Inspect the new nylon O-ring for any defects
Apply a very thin layer of silicone grease to the gasket
Do not over-grease – excess grease can attract dirt
Step 4: Install the New Gasket
Carefully place the gasket into the case recess
Ensure the gasket is seated evenly without twists or kinks
The gasket should sit flat in the channel
Step 5: Reinstall the Bezel
Position the bezel assembly over the case
Use a crystal press with appropriate dies to press the bezel evenly back into place
Apply steady, even pressure
Rotate the bezel to confirm smooth operation with distinct clicks
Step 6: Water Resistance Testing
MANDATORY: Professional water resistance testing is required after any bezel or gasket replacement
The Deepsea should be tested to its rated 3,900m specification
Important Notes:
The Deepsea 116660 features a thicker crystal (5.5mm) and larger case than standard Sea-Dweller models
The gasket is a single-use component and must be replaced with a new one
Professional installation by a Rolex-trained watchmaker is strongly recommended
Common Reasons for Bezel Gasket Replacement:
| Reason | Description |
|---|---|
| Loose bezel rotation | Gasket has compressed or worn over time |
| Bezel feels gritty or rough | Dirt or debris in gasket channel |
| Water ingress | Failed gasket compromising water resistance |
| Bezel removal for service | Gasket must be replaced whenever bezel is removed |
| Bezel no longer clicks properly | Gasket deformation affecting rotation mechanism |
Diagnostic Process:
Visual Inspection: Under magnification, examine the old gasket for compression, cracks, or deformation.
Bezel Rotation Test: Rotate the bezel through its full range. It should turn smoothly with consistent resistance and crisp clicks at each minute position.
Water Resistance Check: If the watch has been exposed to water or shows signs of fogging, internal damage may have occurred.
Gasket Life Expectancy:
| Factor | Impact |
|---|---|
| Normal wear | 5-10 years typical life |
| Frequent bezel rotation | May accelerate wear |
| Exposure to salt water/sand | Can damage gasket |
| Proper lubrication | Extends life |
Step-by-Step Replacement Process:
Assessment: Examine the old gasket to determine the cause of failure. Check the case and bezel for damage.
Cleaning: Thoroughly clean the gasket channel. Remove all old grease, dirt, and debris.
Gasket Replacement: Always install a NEW gasket when the bezel is removed.
Lubrication: Apply a very thin layer of silicone grease to the new gasket.
Installation: Follow the installation instructions above.
Bezel Test: Rotate the bezel to confirm smooth operation and proper click feel.
Water Resistance Test: MANDATORY – Perform professional water resistance testing to the watch‘s rated 3,900m specification.
When to Seek Professional Help:
You lack a bezel removal tool or crystal press
The ceramic bezel shows signs of cracks or damage
The case is damaged or deformed
The watch requires water resistance testing equipment
The watch has significant monetary or sentimental value
Preventive Maintenance:
Professional service every 5-10 years recommended
Annual water resistance testing if the watch is used for diving
Rinse the watch with fresh water after saltwater exposure
Avoid rotating the bezel underwater when possible
Have gaskets replaced during regular service intervals
Q1: What is the water resistance rating of the Deepsea 116660?
A: The Rolex Sea-Dweller Deepsea 116660 has a water resistance rating of 3,900 meters (12,800 feet) . This is one of the highest ratings for a production mechanical watch, made possible by the Ringlock system and helium escape valve. After any bezel or gasket replacement, water resistance must be professionally tested to this specification.
Q2: Can I reuse the old gasket?
A: No. Bezel gaskets compress over time and should never be reused once the bezel has been removed. Gaskets are single-use components because:
They take a compression set over time
Removal can damage or deform the gasket
Old gaskets lose elasticity and sealing ability
Always install a new gasket whenever the bezel is removed.
Q3: Does this gasket need lubrication?
A: Yes. Apply a very thin layer of silicone grease to the gasket before installation. This:
Aids installation by helping the gasket seat properly
Ensures proper sealing
Prevents the gasket from drying out
Allows smooth bezel rotation
Do not use other lubricants (e.g., watch oil, WD-40, petroleum jelly), as these can damage the nylon material or attract dirt.
Q4: How often should the bezel gasket be replaced?
A: The bezel gasket should be replaced:
Whenever the bezel is removed for service – gaskets are single-use components
If the bezel rotation becomes loose or gritty
Every 5-10 years as part of regular maintenance
If water resistance is compromised
Unlike case back gaskets which are often replaced at every service, bezel gaskets are specifically single-use and must be replaced if the bezel has been taken off.
Q5: Can I install this gasket myself?
A: Not recommended for inexperienced users. The Rolex Sea-Dweller Deepsea is a professional diver‘s watch rated for 3,900m water resistance. Bezel removal and gasket replacement require specialized tools (bezel removal tool, crystal press) and expertise. The ceramic bezel is brittle and can crack under uneven pressure. Professional installation by a Rolex-trained watchmaker is strongly advised. After installation, professional water resistance testing is mandatory to verify the 3,900m seal.
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