Mercury MerCruiser Quicksilver Gasket-Thermostat 804878
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
The Mercury MerCruiser Quicksilver Gasket-Thermostat 804878 is cataloged as Mercury-Mercruiser 27-804878 GASKET-THERMOSTAT.
This number is listed in Mercury catalog data as no longer made or no longer available; confirm current availability before ordering old-stock or replacement inventory.
Key Features
- Part number: 804878
- Product type: Gasket-Thermostat
- Category: Seals, Gaskets & O-Rings
- Exact part-number listing
- Status: no longer made/no longer available in current listing data
- Mercury-Mercruiser 27-804878 GASKET-THERMOSTAT
Product Details
- Mercury-Mercruiser 27-804878 GASKET-THERMOSTAT
- Mercury-Mercruiser 27-804878 GASKET-THERMOSTAT is no longer made and is no longer available
Engine Compatibility
Use this part where the Mercury, MerCruiser, or Quicksilver parts diagram calls for this exact number. If the product has a known application note above, match that note to the installed engine, drive, or assembly before ordering.
Fitment Notice
Verify the part number against the current Mercury parts diagram, model, serial number, and assembly location. Similar Mercury hardware, seals, electrical parts, and drive components can vary by production range.
When This Part Needs Replacement
Replace during disassembly, resealing work, leakage diagnosis, or whenever the old sealing surface is crushed, hardened, torn, flattened, or contaminated.
Installation Notes
Clean the mating surfaces, replace related seals or gaskets disturbed during disassembly, and follow the Mercury service manual for orientation, lubrication, tightening sequence, and torque.
Alternate/Superseded Part Numbers
- Requested/listed number: 804878
Parts Desk Insight
Order Mercury parts by the number in the diagram first, then use the product name as a secondary check. This is especially important on repowered boats or assemblies that may have been updated under a superseded number.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.