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Quicksilver 863631T1 Water Distribution Housing Assembly MerCruiser Standard Cooling

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

863631T 1
09/12/2036 5:50 AM
Sale Price

$257.96

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Quicksilver 863631T1 Water Distribution Housing Assembly is a genuine OEM Mercury Marine component engineered for MerCruiser stern drive and inboard gas engine cooling systems. This housing serves as the central hub of the engine's freshwater cooling circuit, directing coolant flow to and from the thermostat housing, fuel cooler, water circulating pump, and exhaust elbow to maintain safe, regulated operating temperatures.

Designed as a direct-fit replacement, this assembly features a 3 and 7-point drain configuration for standard cooling systems, making winterization and routine maintenance straightforward. It is the factory-authorized successor to earlier part numbers 863802T2 and 863444T2.

Key Features:

  • Genuine Quicksilver / Mercury Marine OEM factory part
  • 3 and 7-point manual drain ports for standard cooling configuration
  • Engineered for precise fitment on MerCruiser Alpha and Bravo stern drives and inboard applications
  • Replaces superseded part numbers: 863802T2 and 863444T2
  • Backed by Mercury Marine's 1-year factory warranty against defects in materials and workmanship

Compatible Engine Displacements:

  • 4.3L (262 CID) V6
  • 5.0L (305 CID) V8
  • 5.7L (350 CID) V8 — including 350 Mag MPI Alpha/Bravo, Horizon, MIE, and Ski variants
  • 6.2L (377 CID) V8 — including 377 Mag MPI Bravo
  • 383 Mag Stroker (383 CID)
  • Quicksilver Manufactured 5.7L 350 CID MPI Alpha and Bravo engines

OEM / Cross-Reference Part Numbers: 863631T1 | 863631A1 | 863802T2 | 863444T2

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