Sierra Power Pack 18-99323 for Johnson Evinrude CD3/6 Outboard Engines

The Sierra 18-99323 is a power pack built for Johnson Evinrude outboard engines using the CD3/6 ignition system. The power pack is the central switching module of a capacitor discharge ignition setup, controlling spark timing and delivery to the engine's cylinders. As an ignition system component, it plays a direct role in reliable starting and smooth running, and is a common replacement part when an outboard develops hard-starting, misfiring, or intermittent ignition symptoms tied to the CD3/6 system.

This part is sold under Sierra part number 18-99323 and is identified by UPC 736983850171. It is intended as a direct fit for Johnson Evinrude outboards equipped with the CD3/6 power pack ignition arrangement, allowing an owner or technician to replace a failed or aging unit with a like-for-like component rather than sourcing a used original part.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99323
• Product Category: Evinrude Outboard Power Pack
• UPC: 736983850171
• Weight: 0.64 pounds

Fitment

• Johnson Evinrude outboard engines with CD3/6 ignition

Replaces (OEM)

• No OEM cross-reference numbers published for this part

Frequently Asked Questions

What engines does the Sierra 18-99323 power pack fit? The 18-99323 is built for Johnson Evinrude outboard engines that use the CD3/6 ignition system.

What is a power pack on an outboard engine? A power pack is the ignition control module in a capacitor discharge (CD) ignition system, and on the Johnson Evinrude CD3/6 setup the Sierra 18-99323 serves as this switching and timing component.

How much does the 18-99323 power pack weigh? It weighs 0.64 pounds.

How can I confirm I am ordering the correct part? Sierra part number 18-99323 and UPC 736983850171 both identify this specific Johnson Evinrude CD3/6 power pack, so matching either number confirms the correct item.

Is the 18-99323 a new part or refurbished? The Sierra 18-99323 is sold as a replacement power pack unit for Johnson Evinrude CD3/6 outboards.

What symptoms indicate a power pack needs replacement? Hard starting, misfiring, or intermittent spark on a Johnson Evinrude outboard with CD3/6 ignition are common signs pointing to the power pack, which the 18-99323 is designed to replace.

Does the 18-99323 include mounting hardware or wiring? The listing covers the Sierra 18-99323 power pack unit itself for Johnson Evinrude CD3/6 outboards.

Can this power pack be used on both Johnson and Evinrude branded outboards? Yes, the Sierra 18-99323 is designated for Johnson Evinrude outboards with the CD3/6 ignition system, covering both brand names under that shared ignition platform.

What ignition system does the CD3/6 designation refer to? CD3/6 refers to the capacitor discharge ignition arrangement used on the Johnson Evinrude outboards that the Sierra 18-99323 power pack is built to fit.