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

🚤 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.

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

⚠️ Common Signs of 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

🔄 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
• 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.

📦 Condition

• Genuine BRP Evinrude Johnson OEM part
• Brand new
• Supplied in genuine or equivalent protective packaging