My Account
Shopping Cart

Quicksilver 87290A4 Thermostat Housing Assembly for MerCruiser GM V6 V8 Engines

Manufacturer

Quicksilver

<p>Since 1950, Quicksilver has been delivering premium marine parts, accessories, and lubricants that set the standard for quality and performance on the water. As the premier supplier of Mercury Marine original-equipment parts and accessories, Quicksilver occupies a unique position in the marine aftermarket industry—it's the only marine brand manufactured and recommended by an original-equipment manufacturer.</p> <h3>Engineering Excellence Backed by Mercury Marine</h3> <p>What sets Quicksilver apart from other aftermarket brands is its direct connection to Mercury Marine's engineering expertise. No aftermarket company comes close to Quicksilver's level of research and design, and literally millions of hours have been spent on fired-engine testing and analysis. This rigorous development process ensures that every component meets the exacting standards required for marine environments, where reliability isn't just a preference—it's essential.</p> <p>Quicksilver offers the widest range of premium replacement parts and lubricants for Mercury engines and drives in the marine industry, while their expertise makes Quicksilver aftermarket parts and lubricants outstanding choices to service most major marine engine brands. Whether you're maintaining a Mercury, Yamaha, Honda, or Suzuki outboard, Quicksilver provides OEM-quality solutions that fit and function like the original components.</p> <h3>Comprehensive Product Range for Every Marine Application</h3> <p>From critical propulsion components to routine maintenance items, Quicksilver covers the full spectrum of marine parts needs. Their <a href="/200836-quicksilver-propellers-quicksilver-7456">propeller selection</a> represents decades of hydrodynamic research, offering precision-engineered designs that maximize thrust, fuel efficiency, and handling across different hull configurations and engine combinations.</p> <p>For fuel system reliability, <a href="/200446-fuel-pumps-kitscarburetor-kits-quicksilver-7456">Quicksilver fuel pumps and carburetor kits</a> deliver consistent performance even in demanding marine conditions where ethanol-blended fuels and temperature extremes can compromise inferior components. The brand's <a href="/200835-quicksilver-manifoldsriserselbows-quicksilver-7456">exhaust manifolds, risers, and elbows</a> are engineered specifically to handle the corrosive marine environment, featuring materials and coatings that resist saltwater degradation.</p> <p>Cooling system maintenance becomes straightforward with <a href="/2208-engine-water-pump-quicksilver-7456">Quicksilver water pumps</a> and impeller kits designed for easy installation and reliable operation. Regular impeller replacement is one of the most critical preventive maintenance tasks for any marine engine, and Quicksilver kits include all necessary gaskets and components for professional-grade results.</p> <p>The brand's <a href="/200382-external-engine-parts-quicksilver-7456">external engine parts</a> portfolio ensures that boat owners and marine technicians can source everything from mounting hardware to trim system components with confidence in fit and durability.</p> <h3>Quality You Can Trust</h3> <p>Quicksilver has earned a loyal following by providing the highest quality products for more than 60 years, and consumers consider it one of the most trusted brands in the markets it serves. With over 40,000 parts across 12 product lines, Quicksilver products can be found throughout the world, supporting recreational boaters, commercial operators, and marine service professionals alike.</p> <p>This commitment to quality extends beyond parts to include specialized marine lubricants, fuel additives, and maintenance products formulated specifically for the unique demands of marine engines. When you choose Quicksilver, you're buying performance, protection, and peace of mind—qualities that matter when you're miles from shore or simply want to maximize your time on the water.</p>

Part Number

87290A 4
07/16/2036 10:55 AM
Sale Price

$492.79

Out of Stock

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Quicksilver 87290A4 Thermostat Housing Assembly is a genuine OEM replacement thermostat housing designed for MerCruiser sterndrive engines equipped with GM V6 and V8 powerplants. This upper thermostat housing mounts at the engine's cooling system outlet and features a threaded port on top to accept a Tee ball valve, which is a standard configuration on these MerCruiser applications.

Key Features:

  • Genuine Quicksilver / Mercury Marine OEM part — not aftermarket
  • Direct factory replacement for MerCruiser part number 87290A4
  • Compatible with GM V6 4.3L and V8 305/5.0L and 350/5.7L MerCruiser sterndrive engines
  • Covers a wide range of model years from 1982 through 1995
  • Threaded top port accommodates Tee ball valve (sold separately)
  • Built to Mercury Marine factory specifications for proper sealing and coolant flow

Cross-Reference Part Numbers:

  • Mercury / MerCruiser OEM: 87290A4
  • Sierra Marine: 18-1994
  • GLM Marine: 13230

This thermostat housing assembly is a critical component in the engine's raw-water cooling circuit. Replacing a cracked, corroded, or leaking housing with a genuine Quicksilver part ensures a precision fit, proper thermostat seating, and reliable engine temperature regulation for inboard and sterndrive marine applications.

Quick and low cost

Ordered on the 20th. Received on the 26th. Parts installed within half an hour of receiving them. No complaints and I'm very happy with the transaction. Would purchase from Autoplicity again.<br> Thanks!

Instant email updates, easy website to navigate. I like that they have multiple payment selections to choose from.

Easy to navigate and find part needed Good Price !

very quick and easy

I had been working with a salesman to purchase an exhaust. In the midst of this, something happened and the price went up. After relaying this to the salesman, he agreed to honor it at the first price. That shows a lot of character for a company that wants to please it's customers! Would definitely buy from them again!

Fast and friendly

best site on the web for any automotive parts.

easy use

By far the most inexpensive price in the web by over 30%! I will continue to do business with this supplier without looking elsewhere. They are a true delight!

Lowest price I found on the Web. Super fast order processing and delivery! It's a pleasure doing business with such a reliable<br>merchant. I'll look here first for all my future auto needs!

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy