Mercury MerCruiser Quicksilver Sterndrive Transom Seal 455771
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Mercury MerCruiser Quicksilver 455771 is a genuine OEM seal used in select MerCruiser sterndrive and transom assembly service applications. The full Mercury part reference is commonly listed as 26-455771, with current Mercury references showing it replaced by 8M0204680. This seal is used in drive-related sealing locations where the correct OEM seal profile is required to help prevent water intrusion, oil leakage, or pressure loss in the serviced assembly.
Key Features
- Genuine Mercury Marine / Quicksilver OEM seal.
- Part number 455771 / 26-455771.
- Current replacement part number: 8M0204680.
- Commonly identified as a MerCruiser lower-unit / drive seal.
- Used in select MerCruiser sterndrive and transom assembly applications.
- Common dimensional references list approximately 0.3125" shaft / inner diameter and 0.4375" outer diameter.
- Small sealing component that should be matched by exact parts diagram, not by visual size alone.
Engine Compatibility
This is not an engine-only part. The strongest supportable fitment is by MerCruiser drive model, transom assembly, and serial-number-based parts diagram.
Commonly associated applications include:
- R / MR / Alpha One sterndrives
- Alpha One Gen II sterndrives
- Bravo One
- Bravo Two
- Bravo Three
- Bravo X / XR / XZ drive families
- Select MerCruiser transom assemblies
- Select Vazer drive and transom applications
Because this seal appears across multiple MerCruiser drive families and service diagrams, the exact installation location should be confirmed before ordering.
Serial Number Fitment Notice
Verify fitment by exact drive or transom serial number and the correct Mercury MerCruiser parts diagram. This seal is used across several sterndrive families, and similar seals can appear in nearby drive, lower-unit, water-pump, or transom service areas.
When This Part Needs Replacement
Replace this seal when the original is worn, flattened, cut, hardened, missing, or removed during drive service. It should also be replaced any time the serviced assembly is opened and the old seal can no longer provide a reliable sealing surface.
Installation Notes
Install 455771 or its current replacement 8M0204680 only after confirming the correct diagram callout. Clean the mating surfaces, inspect the surrounding hardware for corrosion or pitting, and make sure the seal is seated correctly during reassembly. Because this is a small drive seal, improper matching or installation can lead to leaks and repeat service.
Alternate / Superseded Part Numbers
Current replacement part number: 8M0204680.
Related numbers commonly associated with this seal family include:
- 26-455771
- 455771
- 45577
- 26-45577
- 45577B
- 45577B1
- 26-45577B1
- Sierra 18-2944
Parts Desk Insight
The easy mistake with this seal is ordering by size or appearance alone. On MerCruiser drives, small seals can look very similar, so matching the exact drive serial number and diagram callout is the safest way to avoid a leak after reassembly.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.