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Quicksilver 860256A 4 Thermostat Housing Assembly MerCruiser V6 V8 Bravo Sterndrive

Manufacturer

Quicksilver

<h3>Quicksilver: The Marine Enthusiast&apos;s Trusted OEM Brand</h3><p>For boaters who refuse to compromise on quality, <strong>Quicksilver</strong> has been the benchmark for marine parts, accessories, and engine care products since 1950. Based in Fond du Lac, Wisconsin, Quicksilver operates as the parts and accessories brand of Mercury Marine — and that heritage is central to everything it makes. As the only marine aftermarket brand manufactured and recommended by an original-equipment manufacturer, Quicksilver brings factory-level engineering directly to boat owners, professional technicians, and weekend warriors alike.</p><p>What sets Quicksilver apart from generic aftermarket suppliers is its direct lineage to the engineers who designed the engines in the first place. Every component is engineered, tested, and manufactured with the same exacting standards as the original equipment it replaces. The result is a product line that fits right the first time and delivers the reliability boaters depend on — whether they&apos;re navigating calm inland lakes or pushing through demanding saltwater conditions.</p><p>Quicksilver&apos;s catalog spans more than 40,000 parts across 12 product lines, covering outboard and sterndrive engines from Mercury, Mariner, Yamaha, Honda, Evinrude, Johnson, Suzuki, and more. Among the most critical components in that lineup are Quicksilver Fuel Pumps, which are built to deliver factory fit and consistent fuel delivery across a wide range of outboard applications. Reliable fuel delivery is the foundation of engine performance, and Quicksilver&apos;s fuel system components are engineered to handle the demanding conditions of marine use — including compatibility with current fuel formulations.</p><p>Beyond fuel systems, Quicksilver is a go-to source for Propeller Parts &amp; Accessories that help boaters maintain and optimize their propulsion systems. From hub kits that protect both prop and gearcase to installation hardware and prop tools, these components are designed to the same tolerances as the drives they support. Proper propeller maintenance is one of the most impactful things a boat owner can do for performance, efficiency, and engine longevity — and Quicksilver makes that job straightforward.</p><p>The brand&apos;s commitment extends across lubricants, impellers, thermostats, anodes, fuel filters, oil filters, maintenance kits, and complete service packages — all engineered for the marine environment and tested to meet or exceed the standards of major engine manufacturers. Whether you&apos;re performing routine seasonal maintenance or tackling a more involved repair, Quicksilver provides the parts that restore your engine to peak operating condition.</p><ul style="list-style:disc"><li>OEM-backed engineering from Mercury Marine</li><li>Compatible with Mercury, Yamaha, Honda, Evinrude, Johnson, Suzuki, and Mariner engines</li><li>Over 40,000 parts spanning 12 product lines</li><li>Formulated and tested for freshwater and saltwater environments</li><li>Trusted by DIY boaters and professional marine technicians since 1950</li></ul><p>When reliability on the water is non-negotiable, Quicksilver delivers the peace of mind that only a true OEM-backed brand can provide.</p>

Part Number

860256A 4
09/12/2036 9:25 AM
Sale Price

$383.59

In Stock (5)

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Product Details

The Quicksilver 860256A 4 is an OEM genuine factory thermostat housing assembly designed for MerCruiser inboard and sterndrive applications. This housing is a critical component of the engine's closed cooling system, directing coolant flow to maintain optimal operating temperature and prevent overheating in marine environments.

Key Features:

  • Genuine OEM Quicksilver / Mercury Marine part — not aftermarket
  • Designed for MCM/MIE GM V-6 and V-8 engines (305 & 350 CID) equipped with Bravo sterndrives
  • Compatible with MerCruiser 4.3L V6, 5.0L, 5.7L, and 6.2L V8 engine configurations
  • Four-pipe thermostat housing design for proper coolant routing
  • Direct OEM replacement for worn, cracked, or damaged thermostat housings
  • Sold as a single housing assembly (gaskets, bolts, seals, and plugs not included)

Replaces / Cross-Reference Part Numbers:

  • Mercury / Quicksilver OEM: 860256A2, 860256A3, 861006A1, 87290A4, 8M0061381
  • Aftermarket: MAL9-42500, SIE18-1989, 18-3530, 18-35301, 855470

This is a genuine Mercury Marine factory part backed by Mercury Marine's standard 1-year factory warranty against defects in materials and workmanship. Ensure proper fitment by confirming your MerCruiser engine serial number prior to ordering.

Website looks good. Product description a little confusing. Not sure if I was ordering a set or a single item.

Shipping could be a little cheaper, probably should have shopped around more but I'm tired of being on the internet, I give up and just pay it.

Easy to use site with competitive pricing.

easy to find most parts could not find front emblem for grill

Tried to call support but stayed on hold for 32 minutes with it saying I'm next in line but it is what it is

quick easy and best price

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