---
product_id: 2410457
title: "Sierra 18-3899 Marine Cover Gasket for Johnson/Evinrude Outboard Motor"
brand: "sierra"
price: "21151CFA"
currency: XOF
in_stock: true
reviews_count: 11
category: "Sierra"
url: https://www.desertcart.sn/products/2410457-sierra-18-3899-marine-cover-gasket-for-johnson-evinrude-outboard
store_origin: SN
region: Senegal
---

# Marine-grade durability Precision machined fit OEM-exceeding reliability Sierra 18-3899 Marine Cover Gasket for Johnson/Evinrude Outboard Motor

**Brand:** sierra
**Price:** 21151CFA
**Availability:** ✅ In Stock

## Summary

> ⚓ Seal your power with confidence — don’t let leaks sink your ride!

## Quick Answers

- **What is this?** Sierra 18-3899 Marine Cover Gasket for Johnson/Evinrude Outboard Motor by sierra
- **How much does it cost?** 21151CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/2410457-sierra-18-3899-marine-cover-gasket-for-johnson-evinrude-outboard)

## Best For

- sierra enthusiasts

## Why This Product

- Trusted sierra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Perfect OEM Fit:** Meets or exceeds original equipment specs for seamless installation
- • **Proven Leak-Free Seal:** Customer-verified zero leaks even after decades of engine use
- • **Marine-Grade Durability:** Resists harsh saltwater and weather conditions for long-lasting protection
- • **Trusted by Professionals:** Backed by Sierra’s industry-leading customer satisfaction warranty
- • **Engineered for High Horsepower:** Built to handle 20-35 HP Johnson/Evinrude motors with flawless performance

## Overview

The Sierra 18-3899 Marine Cover Gasket is a precision-machined, OEM-quality replacement part designed for 20-35 HP Johnson/Evinrude outboard motors. Engineered to withstand harsh marine environments, it ensures a perfect, leak-free seal backed by Sierra’s top-tier warranty and trusted by professionals for reliable, long-term performance.

## Description

Sierra products are engineered to meet today’s high horsepower engine demands and stand up in the harsh marine environment. All Sierra products meet or exceed the original equipment part it replaces. Sierra supplies many OEM engine manufacturers and boat builders hundreds of quality parts every day

Review: 35 hp - Gasket lined up and fit perfectly on 1979 Johnson 35hp. No leaks. I’m very happy and shipping was on time as projected. Thank you.
Review: Worked great! - No leaks even with two snapped off bolts. Be careful when removing the bolts, i was working on an engine that sat for 20 years, sprayed the bolts with blaster for 2 days and still rung off two bolts.

## Features

- For : 20, 25, 25C, 30, 35
- All Sierra parts qualify for and are covered under Sierra's industry leading customer satisfaction warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001IV030M |
| Best Sellers Rank | #511,500 in Automotive ( See Top 100 in Automotive ) #711 in Powersports Engine Gaskets |
| Brand | Sierra |
| Customer Reviews | 4.6 4.6 out of 5 stars (116) |
| Date First Available | October 20, 2008 |
| Exterior | Machined |
| Global Trade Identification Number | 00808282244118 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.317 ounces |
| Item model number | 18-3899 |
| Manufacturer | Sierra |
| Manufacturer Part Number | 183899 |
| Model | Water Cover Gasket |
| OEM Part Number | OMC 327674 |
| Product Dimensions | 0.39 x 0.39 x 0.39 inches |
| Shape | Round |
| UPC | 808282244118 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Sierra
- **Manufacturer:** Sierra
- **Shape:** Round
- **UPC:** 808282244118
- **Unit Count:** 1.0 Count

## Images

![Sierra 18-3899 Marine Cover Gasket for Johnson/Evinrude Outboard Motor - Image 1](https://m.media-amazon.com/images/I/51oGMaBxkgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 35 hp
*by P***T on September 11, 2021*

Gasket lined up and fit perfectly on 1979 Johnson 35hp. No leaks. I’m very happy and shipping was on time as projected. Thank you.

### ⭐⭐⭐⭐⭐ Worked great!
*by J***3 on June 11, 2022*

No leaks even with two snapped off bolts. Be careful when removing the bolts, i was working on an engine that sat for 20 years, sprayed the bolts with blaster for 2 days and still rung off two bolts.

### ⭐⭐⭐⭐⭐ Perfect fit....
*by W***K on July 29, 2021*

Fit was perfect. Problem solved!

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**Shop now:** [https://www.desertcart.sn/products/2410457-sierra-18-3899-marine-cover-gasket-for-johnson-evinrude-outboard](https://www.desertcart.sn/products/2410457-sierra-18-3899-marine-cover-gasket-for-johnson-evinrude-outboard)

---

*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-03-12*