Mercury MerCruiser Quicksilver — Bearing Carrier O-Ring — 8M0214920
In stock items ship same or next day.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury MerCruiser Quicksilver Bearing Carrier O-Ring 8M0214920
Mercury MerCruiser Quicksilver 8M0214920 is a genuine OEM sealing O-ring used primarily around the gearcase bearing carrier or bell-housing assembly on select Mercury, Mariner, and MerCruiser applications. It provides the static seal between the bearing carrier and surrounding gear housing, helping retain gear lubricant and prevent water intrusion.
Compatible Applications
- Select Mercury and Mariner outboard lower-unit bearing-carrier assemblies
- Select Mercury V6 outboard gearcases
- Select legacy Mercury and MerCruiser gearcase or bell-housing applications
- Applications whose OEM diagram specifies 8M0214920, 31534, or another number officially superseded to 8M0214920
Fitment notice: This O-ring is used across multiple gearcase families. Confirm compatibility using the engine or drive serial number and the applicable OEM gearcase diagram. Do not select it by appearance or approximate diameter alone.
Part Details
- Current OEM part number: 8M0214920
- Mercury prefix reference: 25-8M0214920
- Brand: Mercury MerCruiser Quicksilver
- Product type: Bearing carrier O-ring
- System: Lower-unit or gearcase sealing
- Condition: New
Alternate and Superseded Part Numbers
- 31534: Bearing carrier O-ring
- 48451: Earlier O-ring or bell-housing application
Mercury parts references identify both earlier numbers as superseded to 8M0214920.
Key Features
- Genuine OEM sealing component
- Designed to seal the bearing carrier to the gear housing
- Common service item during bearing-carrier, propeller-shaft, or gearcase work
- Current replacement for earlier Mercury O-ring numbers
When to Replace This O-Ring
Replace the O-ring whenever the bearing carrier is removed or if the existing seal is flattened, hardened, cut, nicked, or distorted. Replacement should also be considered when gear lubricant is leaking around the carrier, water is found in the gear lubricant, or propeller-shaft seals and bearing-carrier components are being serviced.
Installation Notes
Clean the O-ring groove and mating surfaces, then inspect them for corrosion, debris, or damage. Install the seal without twisting, excessive stretching, or cutting it against sharp edges. Use the lubricant and assembly procedure specified for the particular gearcase, and follow the applicable service-manual procedure for bearing-carrier installation and retention. Check the gearcase for proper sealing after service.
Technical FAQ
Should this O-ring be reused after removing the bearing carrier?
Replacement is the safer service choice. A previously compressed seal may be flattened or damaged and may not provide the same sealing pressure after reassembly.
Does appearance confirm fitment?
No. Mercury used several similar O-rings across lower-unit and sterndrive assemblies. Match the complete part number to the serial-specific diagram.
What does this O-ring help prevent?
It helps retain gear lubricant and prevent water from entering around the bearing-carrier joint.
Parts Desk Insights
Best use case: Installing a fresh bearing-carrier seal whenever the carrier is removed for propeller-shaft, seal, bearing, or gearcase service.
Most common mistake: Reusing an O-ring that looks acceptable but has been flattened or nicked during removal. Small damage can lead to gear-oil leakage or water intrusion after reassembly.
Fitment guidance: Confirm 8M0214920, 31534, or another officially superseded number on the exact engine or drive diagram before installation.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.