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Quicksilver 806612T Knock Sensor for MerCruiser GM V-8 Engines

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

806612T
09/12/2036 7:01 AM
Sale Price

$163.82

In Stock (10+)

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Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The Quicksilver 806612T Knock Sensor is a genuine OEM Mercury Marine replacement part designed to protect MerCruiser and MIE inboard/sterndrive engines from damaging detonation. The knock sensor monitors engine vibration frequencies associated with pre-ignition and detonation events, signaling the engine control module (ECM) to retard ignition timing and prevent internal engine damage.

This is a direct factory replacement part, ensuring correct fit, function, and durability consistent with original Mercury Marine engineering standards.

Key Features:

  • Genuine OEM Quicksilver/Mercury Marine replacement knock sensor
  • Monitors engine block vibrations to detect detonation and pre-ignition
  • Signals ECM to adjust ignition timing, protecting engine internals
  • Direct fit replacement — no modifications required
  • Compatible with MCM (sterndrive) and MIE (inboard) configurations

Cross-Reference Part Numbers:

  • Mercury/Quicksilver OEM: 806612T
  • Sierra Marine: 18-7677
  • Crusader: R020027
  • Evinrude/Johnson OMC/BRP: 3850357
  • Volvo Penta: 22024631

Restore proper engine management and detonation protection with this factory Quicksilver knock sensor — the reliable OEM choice for MerCruiser GM V-8 powered vessels.

A+, great prices

Easy transaction

Best prices, fast shipping, good service. Thank you!

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Great price and easy ordering. Had a problem with the sensor not turning on the fans. Used an old sensor and everything is working good now.

Shipping seems a bit high even with the discount

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