Mercury MerCruiser Quicksilver Washer Assembly 12-55073A2
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Mercury Quicksilver Washer Assembly – Part No. 12-55073A2
This is a genuine OEM Mercury Marine / Quicksilver washer assembly used in MerCruiser engine and sterndrive applications. The A2 suffix designates a revised assembly version — this is the current production specification and supersedes earlier revisions. At this price point, this is a precision washer assembly (such as a thrust washer stack, sealing washer assembly, or bearing-interface washer set) rather than a simple flat washer. Always confirm the correct diagram position using your engine model and serial number before ordering.
Part Details
- Part Number: 12-55073A2 (also referenced as 55073A2)
- Brand: Mercury Marine / Quicksilver
- Official Product Type: Washer Assembly
- Revision: A2 — current production specification
- System: Engine or drive assembly — confirm via parts diagram
- Condition: New OEM
Compatible Applications
- MerCruiser engine and sterndrive assemblies — specific position varies by model and serial number range
- Verify fitment using the Mercury parts diagram, engine model, and serial number before ordering
- The A2 revision supersedes earlier versions — if your diagram shows an earlier suffix, this is the correct current replacement
Installation Notes
- Clean all mating surfaces before installation
- Confirm orientation using the Mercury service manual — washer assemblies are often directional
- Replace all seals and gaskets disturbed during disassembly
- Follow Mercury service manual torque specifications for all associated fasteners
- Do not reuse a washer assembly that shows wear, deformation, or scoring on sealing surfaces
Service Interval
Replace whenever the assembly is disassembled for overhaul or repair, when leakage or wear is detected at the washer interface, or when the assembly shows visible deformation or surface damage. Mercury service procedures typically specify replacing washer assemblies rather than reusing them after disassembly.
Parts Desk Insights
Best use case: Overhaul and rebuild work where the washer assembly is disturbed or shows wear. The A2 revision designation means this is the updated production part — it is the correct replacement regardless of which earlier revision was originally installed. If you’re sourcing parts for a full rebuild, order this alongside related seals and gaskets for the same assembly to avoid a second parts run.
Common mistakes: Ordering by the short number (55073) without the A2 suffix and receiving an older revision — always use the full part number including the revision letter. Also confirm the diagram position: Mercury uses several washer assemblies across different engine and drive locations that share similar part number formats but are not interchangeable.
Related Parts
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
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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.
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