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Sierra 18-6089 Magnesium Anode for MerCruiser Bravo Stern Drive Trim Rams

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-6089
07/13/2036 12:00 AM
Sale Price

$29.08

In Stock (9)

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-6089 is a magnesium sacrificial anode engineered for MerCruiser Bravo stern drive trim cylinder rams. Sacrificial anodes protect metal underwater components from galvanic corrosion by acting as the preferred corrosive target, dissolving slowly over time to safeguard the drive and associated hardware.

Key Features:

  • Magnesium construction — specifically formulated for fresh water use only; magnesium provides superior electrochemical activity in low-conductivity fresh water environments
  • Designed to protect Bravo trim cylinder arm/rod assemblies, including Bravo I, Bravo II, Bravo III, XR, XZ, and Blackhawk drives
  • Replaces OEM MerCruiser part numbers: 806190, 806190A1, 806190B4, 806190Q1, 97-806190Q1, 97-806190T1, 97-8M0059342
  • Sierra products meet or exceed OEM specifications for a reliable, direct-fit replacement
  • Simple drop-in installation — no modification required

Anode Material Selection Guide:

  • Magnesium — Fresh water applications (this product)
  • Zinc — Salt water applications
  • Aluminum — Brackish or mixed salt/fresh water environments

Manufactured by Sierra International (a Seastar Solutions brand), a trusted name in marine engine replacement parts. Routine anode inspection and replacement is recommended as part of standard seasonal maintenance to ensure ongoing corrosion protection for your stern drive.

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Quick and easy. Could have left or right side in description though. Other than that 1 phone call cleared up the left and right confusion and placed my order. Great service. I even used again for my rear Lateral arms I just purchased

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