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Sierra 18-5910 Starter for Mercruiser Small Block V6 & V8

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

18-5910
06/01/2036 2:41 AM
Sale Price

$269.72

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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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 Sierra 18-5910 is a high-quality replacement starter designed for Mercruiser marine engines with small block V6 and V8 configurations. This starter is engineered to meet or exceed OEM specifications for reliable engine cranking performance in marine environments.

Key Specifications:

  • Designed for small block V6 and V8 Mercruiser engines
  • Compatible with 14-1/4 inch flywheel applications
  • Bottom mount configuration with offset bolt pattern
  • Standard rotation design
  • Direct replacement for Mercruiser part numbers 50-12177A2 and 50-99418A2

This starter features a durable construction built to withstand the harsh marine environment, including corrosion-resistant components and sealed housing to protect against moisture intrusion. The offset bolt pattern ensures proper fitment on compatible Mercruiser engine blocks, while the standard rotation matches factory specifications for reliable starting performance.

Products specifications

Application

Replaces: Mercruiser 50-12177A2, 50-99418A2. OMC: 984456, 986505

Rotation

CW

Type

New

Quick &amp; easy at a phenomenal price!

Quality parts at a good price. Fast delivery. Only reason I did not give five stars was that the parts were not packed securely, and the one package broke open and lost one of the nuts that go to the muffler clamp. Now I have to buy another muffler clamp from the auto parts store. Besides that I was very satisfied with my experience.

Easy

I ordered a truck bed cover and Autoplicity had the lowest price I could find. I was a bit concerned that the delivery time might be longer than from other suppliers but to my surprise it arrived in just over a week. Customer service was good too. They answered all the questions I had about my order prior to shipment.

Good service

No complaints

Exactly what I needed and was very affordable and delivered to my house in only a few days.

Quick and easy with great price

Great place buy what you need for your vehicle. They mad it easy and simple to purchase exactly what I needed right away. Confirmed and shipped it within 24 hours. I would highly recommend using them for all your vehicle needs.

Great Deal Thanks !

There were some communication issues at the beginning. Some confusion about order numbers and shipping led to a couple days of going back and forth with them. In the end, they made every effort to make sure I was satisfied and that my order was complete and correct. Extremely cheap price, I bet I saved almost $100 on 4 EBC rotors. My only complaint is it took almost 2 weeks for shipping, but it did ship directly from the manufacturer so I can't say that's entirely the fault of Autoplicity.<br><br>Order #28295 on 08/26/2012

They have the best prices and fast shipping too.

quick, and easy. low prices as well

Had the parts I wanted and ordering through Amazon account made it easier.

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Great experience

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Almost a perfect score! I was pleased with the customer service but knowledge about their products warranties was lacking. Other than that, the representative that I spoke with on the phone was great. He was friendly and had a good overall knowledge of the products I was asking about. Pointed me in the right direction because I couldn't be happier with my bike rack. They had the best prices, lowest shipping costs, and my order arrived a day early. Great website to work with. I will definitely be doing business again and spreading the word about Autoplicity.com.

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