Mercury MerCruiser Quicksilver Outboard Gearcase and Mounting Washer 8M0135942
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.
Product Description
Mercury Quicksilver 12-8M0135942 is a washer used in specified outboard gear-housing, driveshaft-housing and mounting arrangements. It is the replacement for earlier washer 12-853701.
Key Features
- OEM number: 12-8M0135942.
- Replaces 12-853701.
- Four used at the referenced gear-housing fastening position.
Compatibility and Fitment
Verified in the 8 hp 209 cc FourStroke Command Thrust gear-housing diagram and in 15 hp EFI two-cylinder steering-arm diagrams for serial range 0R833820 through 1R162636. Its exact location and required quantity depend on the assembly.
Replacement and Installation
Replace a distorted, heavily corroded or missing washer and inspect the matching fastener and seating surface. Follow the assembly drawing for washer placement and the engine service procedure for tightening.
Alternate / Superseded Part Numbers
12-8M0135942 replaces 12-853701.
Mercury Parts Finder
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Parts Desk Insight
This washer appears in both lower-unit and mounting diagrams. Order against the callout being repaired; its use in one assembly does not establish the quantity needed in another.
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.