Sierra 18-99177 Johnson/Evinrude Power Pack, Replaces 583110, Fits 1986-1987 4-Cylinder 88/90/110 HP

The Sierra 18-99177 is a power pack built for Johnson/Evinrude 4-cylinder outboard engines, serving as a direct replacement for the original equipment power pack used on 1986-1987 model year 88 HP, 90 HP, and 110 HP engines. The power pack is a core component of the outboard's capacitor discharge ignition system, and this unit is cataloged under the CD4 designation for 4-cylinder applications. It cross-references directly to OEM part number 583110, making it a straightforward swap when an original power pack fails or needs replacement. At 0.6 pounds, it is a compact, lightweight electronic component designed to bolt into the stock mounting location used by the original unit.

This power pack is intended for boat owners and marine technicians servicing Johnson or Evinrude 4-cylinder outboards within the listed horsepower and year range. Ordering by the correct fitment (engine cylinder count, model year, and horsepower) is important, since power packs are engine-specific and not interchangeable across unrelated engine families.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99177
• Product Category: Evinrude Outboard Power Pack
• Compatible Engine Type: Johnson/Evinrude 4-cylinder outboard
• Fitment Years: 1986-1987
• Horsepower Compatibility: 88 HP, 90 HP, 110 HP
• Replaces OEM Number: 583110
• Weight: 0.6 pounds
• UPC: 808282393755

Fitment

• Johnson/Evinrude 4-cylinder outboards, 1986-1987, 88 HP, 90 HP, and 110 HP

Replaces (OEM)

• 583110

Frequently Asked Questions

What does the Sierra 18-99177 power pack replace? The Sierra 18-99177 power pack replaces OEM Johnson/Evinrude part number 583110.

Which engines is the Sierra 18-99177 power pack compatible with? It fits Johnson/Evinrude 4-cylinder outboards from 1986-1987 rated at 88 HP, 90 HP, or 110 HP.

Does the 18-99177 power pack fit 6-cylinder Johnson or Evinrude outboards? No. The Sierra 18-99177 is built specifically for 4-cylinder Johnson/Evinrude outboards, not 6-cylinder engines.

How much does this power pack weigh? The Sierra 18-99177 power pack weighs 0.6 pounds.

Is the Sierra 18-99177 an OEM part or an aftermarket equivalent? It is an aftermarket power pack that cross-references to and replaces the OEM number 583110.

What horsepower ratings use the 583110 replacement power pack? Engines rated 88 HP, 90 HP, and 110 HP on 1986-1987 Johnson/Evinrude 4-cylinder outboards use this power pack.

Will the 18-99177 fit a 1988 or later Johnson/Evinrude outboard? The Sierra 18-99177 is confirmed for 1986-1987 model year 4-cylinder Johnson/Evinrude engines; compatibility outside that year range is not specified.

What is the part number for this power pack? The part number is Sierra 18-99177, which replaces OEM number 583110.

Does the 18-99177 install in the same location as the original power pack? Yes, since it is designed as a direct replacement for OEM part 583110, the 18-99177 fits the stock mounting location used by the original power pack on compatible 4-cylinder Johnson/Evinrude outboards.

What type of ignition system does the Sierra 18-99177 power pack belong to? This power pack is a component of the capacitor discharge (CD) ignition system used on 4-cylinder Johnson/Evinrude outboards, cataloged under the CD4 designation.