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Sierra 18-2756 U-Joint Bellows for MerCruiser Bravo and Blackhawk

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

118-2756
06/01/2036 5:59 AM
Sale Price

$66.58

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Sierra 18-2756 U-Joint Bellows is a premium aftermarket replacement component designed for MerCruiser Bravo and Blackhawk sterndrive systems. This essential bellows seals the drive shaft as it passes through the transom, protecting critical drivetrain components from water intrusion and ensuring reliable performance in harsh marine environments.

Complete Assembly Includes:

  • U-Joint bellows assembly
  • Hose clamp (4-1/16" to 5" diameter)
  • Bellows flange ring
  • Bellows ground clip

Key Features:

  • Fits all MerCruiser Bravo I, Bravo II, and Bravo III drives
  • Compatible with Blackhawk sterndrive models
  • Engineered to meet or exceed OEM specifications
  • Constructed from durable materials designed for marine environments
  • Direct replacement for Mercury/MerCruiser part numbers 86840A3, 86840A05, and 8M0062406

Sierra Marine parts are manufactured to rigorous quality standards, providing reliable performance and long service life. This U-Joint bellows is also cross-referenced with GLM 89140 and Mallory 9-72702, making it a versatile choice for sterndrive maintenance and repair.

Satisfied

Cheapest price around. We&#039;ll see how fast I get it.

So far EXCEPTIONAL!!! I know the helmet will be as well.

everything went smooth and well

received

I placed the order online with no problem, and I received my order a couple of days later. Item was as described and the price was competitive with other vendors.

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