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

🚤 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

🔄 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

📦 Condition

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