0338484 Evinrude Johnson Gasket, Water Pump | Genuine OEM BRP Outboard Part

🔧 Product Description

Genuine BRP Evinrude Johnson Large-Gearcase Water Pump Gasket - Part Number: 0338484

A genuine BRP water-pump gasket for selected high-horsepower Evinrude and Johnson outboard gearcases.

The gasket seals the water-pump plate or impeller-housing assembly against the gearcase, preventing cooling-water pressure loss and reducing the risk of exhaust gas entering the pump inlet area.

⚙️ Key Features

• Genuine BRP OEM water-pump gasket

• Correct OEM part number 0338484

• Common unprefixed number 338484

• Used beneath the water-pump plate or housing

• Suitable for selected large V4, V6, V8 and E-TEC gearcases

• Sierra, SEI, GLM, Mallory and independent replacements available

🔄 Supersession & Cross Reference

OEM / Related Numbers:

• 0338484

• 338484

• 0324701

• 324701

• OEM Description: Water Pump Gasket

• Related impeller-housing seal: 0331353

• Associated wear plate, cup and pump housing vary by gearcase

Aftermarket / Verified Equivalents:

• Sierra: 18-2557

• Sierra: 18-2557-9

• SEI Marine: 95-306-02

• GLM: 33730

• Mallory: 9-60401

• Outboard Spares: OSWG338

• Generic water-pump gaskets replacing 0338484 / 0324701

Aftermarket packaging note:

• Sierra 18-2557-9 is commonly supplied as a multi-gasket package.

• Confirm package quantity when setting inventory or selling individually.

🚤 Compatibility

Commonly used on selected:

• Evinrude and Johnson 90HP-275HP two-stroke outboards from approximately 1980 onward

• Evinrude E-TEC 75HP-300HP gearcases from approximately 2005 onward

• V4 and V6 standard-rotation lower units

• Counter-rotation gearcases

• High-performance and commercial lower units where 0338484 is specified

Important fitment note:

• Gearcase design—not horsepower alone—determines gasket fitment.

• Confirm the water-pump plate and housing arrangement.

• The gasket can appear similar to other OMC pump gaskets but differ in water-passage shape and bolt pattern.

🔌 Function

The gasket seals the stationary water-pump components to the gearcase.

Common signs of gasket failure:

• Weak cooling-water pressure

• Engine overheats

• Pump draws exhaust gas

• Gasket is torn during disassembly

• Water leaks around the plate

• Corrosion damages the gasket surface

• Pump fails to prime after service

Installation considerations:

• Remove the old gasket completely

• Clean both mating surfaces

• Do not gouge the aluminium gearcase

• Confirm all water passages align

• Use sealant only when specified by the service manual

• Tighten the pump housing evenly

• Replace the impeller and seals where required

• Check tell-tale flow and water pressure after installation

📦 Condition

• Genuine BRP Evinrude Johnson OEM part

• Brand new

• Supplied in genuine or equivalent protective packaging