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Sierra 18-3901 Marine Piston Rings for Outboard Engines

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3901
10 reviews
Sale Price

$42.89

1 left at this price

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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 18-3901 is a premium aftermarket piston ring set engineered for marine outboard engine applications. Sierra designs its engine components to meet or exceed original equipment manufacturer (OEM) specifications, ensuring reliable performance and a precise fit during engine rebuild or overhaul.

Sierra is one of the most trusted names in marine aftermarket parts, offering high-quality replacements across a broad range of outboard and stern drive platforms. The 18-3901 piston rings are manufactured to maintain proper cylinder seal, support combustion efficiency, and control oil consumption — critical factors for dependable on-water performance.

Key Features:

  • Engineered to meet or exceed OEM specifications
  • Designed for marine outboard engine applications
  • Supports proper cylinder sealing and compression retention
  • Built to withstand the demands of harsh marine environments
  • Drop-in replacement for simplified engine rebuilds
  • Backed by Sierra's industry-leading manufacturer warranty

Sierra part number 18-3901 is a direct OEM-quality replacement piston ring set, ideal for restoring engine compression and performance during a top-end or complete engine rebuild.

Autoplicity shipped on time as promised and the product arrived in perfect condition.

Its was. Very easy thanks

Found exactly what I wanted

Easy

Awsome service and prices,Thanks alot

Great prices for quality OE parts.

Good price and easy website

Great Prices and Very Fast Shipping. Will order again in the future. Customer Service was great when I called about a question with my order.

Have what we needed at the right price with great postage rates. Super quick posting and great communication. Would recommend to anybody to try Autoplicity first. Thank you.

Great service and super quick shipping. Will use them again

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