# 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

## Details

- **Price:** 2.24 AUD
- **Vendor:** BRP (Evinrude/Johnson)
- **Tags:** Evinrude Johnson Outboard Parts | BRP Marine Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2.24 AUD | In stock |

## Images

- 0311598 Evinrude Johnson Washer | Genuine OEM BRP Outboard Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/0311598-washer)
> Updated: 2026-07-11