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

🚤 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

🔄 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

📦 Condition

• Genuine BRP part
• Brand new
• Supplied in original or equivalent packaging