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Sierra 18-99423 Timer Base for Johnson Evinrude V6 Outboard Engines

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

18-99423
08/07/2036 12:01 AM
Sale Price

$338.84

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 Sierra 18-99423 Timer Base is a premium quality ignition component designed for Johnson and Evinrude 6-cylinder outboard engines. This timer base is a critical part of the electronic ignition system, working in conjunction with the power pack to control ignition timing and ensure proper engine performance.

Key Features:

  • Designed for 1979-1988 Johnson/Evinrude 150, 155, 175, 185, 200, and 235 HP V6 engines
  • Fits cross-flow engines equipped with twin power packs
  • Premium quality construction for extended service life
  • Meets or exceeds OEM manufacturer specifications
  • Includes white glide ring and necessary installation hardware
  • Features 4-pin Amphenol connector for power pack connection

OEM Replacement: This Sierra timer base directly replaces BRP part number 583377 (also 778472) and CDI part number 133-3377. It also supersedes OEM numbers 581985, 582122, 582356, 582357, 582371, 582394, 583129, and 584558.

Sierra marine ignition components are manufactured to rigorous quality standards and are backed by Sierra's limited lifetime warranty. Professional installation by a qualified marine technician is recommended for proper timing and system integration.

No omment

It was exactly what we wanted. Excellent product.

It was what I needed, and worked perfectly, great price

Excellent quick delivery

Simple and seamless process. Great experience.

you have to give the runner 90 feet

It was easy.

None

very good / pleasant experience overall - happily surprised by the fast delivery

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