0311598 Evinrude Johnson Washer | Genuine OEM BRP Outboard Part

🔧 Product Description

Genuine BRP Gearcase Drain and Fill Plug Washer - Part Number: 0311598

A genuine BRP sealing washer used beneath the lower-unit drain and fill screws on Evinrude, Johnson and OMC marine gearcases. The washer creates a fluid-tight seal around the threaded plug, helping retain gear lubricant and prevent water entering the lower unit.

⚙️ Key Features

• Genuine BRP OEM drain-plug washer

• Correct OMC part number 0311598

• Seals lower-unit drain and fill screws

• Suitable for magnetic and non-magnetic plug applications where specified

• Replace whenever the gearcase plug is removed

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3852105 later OMC / Volvo Penta service reference

• 0311598 original OMC sealing-washer reference

OEM / Related Numbers:

• 0311598

• 311598

• 3852105

• Commonly paired with drain screw 0307551

• Commonly paired with magnetic drain screw 0318544

Aftermarket / Verified Equivalents:

• Sierra: 18-4248

• Sierra: 18-4248-9

• Mallory: 9-60408

🚤 Compatibility

Commonly used on:

• Evinrude and Johnson outboard lower units

• OMC inboard and sterndrive gearcases

• OMC sail-drive and marine-transmission housings

• Gearcases using drain or fill screws 0307551 or 0318544

Typically suits:

• Engine and drive applications:

• Evinrude and Johnson small-outboard gearcases

• Evinrude and Johnson midrange outboard gearcases

• Evinrude and Johnson V4 and V6 gearcases

• Evinrude E-TEC and E-TEC G2 gearcases where 0311598 is specified

• OMC Cobra and related sterndrive lubricant plugs

• OMC inboard and sail-drive fill and drain plugs

• HP Range: Gearcase controlled

• Engine Type: Evinrude / Johnson / OMC outboard, inboard and sterndrive

• Year Range: Model and gearcase controlled

🔌 Function

The washer compresses between the drain screw and gearcase housing, sealing the threaded opening against gear-oil leakage and water intrusion.

Common signs of failure:

• Gear lubricant leaking around the plug

• Water or milky contamination in the gear oil

• Washer flattened, cracked or missing

• Gearcase fails pressure or vacuum testing at the plug

• Plug must be overtightened to stop leakage

📦 Condition

• Genuine BRP part

• Brand new

• Supplied in original or equivalent packaging