# 0310327 Evinrude Johnson O-Ring | Genuine OEM BRP Outboard Part

🔧 Product Description

  

Genuine BRP Gearcase Head O-Ring - Part Number: 0310327

  

A genuine BRP O-ring used to seal the gearcase head or propeller-shaft bearing housing on selected Evinrude and Johnson outboards.

  

The seal fits around the outside of the gearcase head and prevents lower-unit lubricant escaping while blocking water from entering the gear and bearing cavity. Its approximate dimensions are 1-7/8-inch inside diameter, 2-1/8-inch outside diameter and 1/8-inch cross-section.

  

⚙️ Key Features

  

• Genuine BRP OEM gearcase-head O-ring

• Correct OMC part number 0310327

• Seals the gearcase head or propeller-shaft housing

• Approximate 1-7/8-inch inside diameter

• Cross-references with Sierra, GLM, Mallory and SEI replacements

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 0310327 current OEM gearcase-head O-ring reference

• 0910582 related OMC O-ring reference with matching dimensions

  

OEM / Related Numbers:

  

• 0310327

• 310327

• 0910582

• 910582

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-7173

• Sierra: 18-7173-9

• GLM: 82250

• Mallory: 9-76501

• SEI Marine: 95-265-01

  

🚤 Compatibility

  

Commonly used on:

  

• Evinrude and Johnson small and midrange outboard gearcases

• Gearcase-head and propeller-shaft bearing-housing assemblies

• Lower units using the 0310327 / 310327 sealing ring

  

Typically suits:

  

• Engine models:

• Johnson 1.5HP Model 1R70R - 1970

• Evinrude 3HP and 4HP weedless-drive gearcase applications

• Johnson 5HP Model LD-12 - 1967

• Evinrude / Johnson 35HP gearcases using bearing housing 0435274

• Evinrude / Johnson 40HP gearcases using 0310327

• Evinrude / Johnson 48HP gearcases using 0310327

• Evinrude / Johnson 50HP gearcases using 0310327

  

• HP Range: Approximately 1.5HP - 50HP

• Engine Type: Evinrude / Johnson small and midrange two-stroke outboard

• Year Range: Approximately 1960s - 1990s, dependent on gearcase design

  

🔌 Function

  

The O-ring seals the outer circumference of the gearcase head or bearing housing. It retains gear lubricant and prevents water from bypassing the housing into the lower unit.

  

Common signs of failure:

  

• Gear oil leaking around the propeller-shaft housing

• Milky or water-contaminated lubricant

• Gearcase fails pressure or vacuum testing

• O-ring flattened, hardened, pinched or cut

• Corrosion around the gearcase-head sealing groove

• Leakage begins after bearing-housing removal or installation

  

📦 Condition

  

• Genuine BRP part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 7.08 AUD
- **Vendor:** BRP (Evinrude/Johnson)
- **Tags:** Evinrude Johnson Outboard Parts | BRP Marine Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 7.08 AUD | In stock |

## Images

- 0310327 Evinrude Johnson O-Ring | Genuine OEM BRP Outboard Part
- 0310327 Evinrude Johnson O-Ring | Genuine OEM BRP Outboard Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/0310327-o-ring)
> Updated: 2026-07-11