Mercury MerCruiser Quicksilver Diesel Air-Cooler Sealing Washer 811483
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Product Description
Mercury MerCruiser Quicksilver 12-811483 is a sealing washer used in specified MerCruiser diesel cooling assemblies. In the D254 Turbo AC air-cooler diagram, it is listed at the anode-plug position.
Key Features
- OEM sealing washer, part 12-811483.
- Air-cooler / aftercooler service location on specified diesel engines.
- Used alongside the separately listed anode plug in the applicable diagram.
Engine Compatibility
Verified applications include MerCruiser D254 Turbo AC VM 254 cu. in. inline-six, 1990–1993, including the Bravo installation. Additional catalog uses include selected D4.2L/200 LD, D4.2L/220 IDI and D4.2L/300 D-Tronic air-cooler assemblies. Confirm the engine and cooler diagram.
Replacement and Installation
Inspect the sealing washer and plug seat when servicing the cooler’s anode or plug. Replace a damaged or compressed washer and clean the mating surfaces. Follow the engine service manual for plug installation, coolant handling and leak checks.
Parts Desk Insight
This washer has a sealing role. Match the air-cooler plug location rather than substituting a general flat washer.
Manufacturer Parts Lookup
Use Mercury’s official parts finder to check the part against your engine or drive serial number.
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.