478M0204676 Mercury MerCruiser Impeller S/S | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump Impeller - Part Number: 47-8M0204676

Genuine Quicksilver/Mercury water pump impeller for selected small Mercury and Mariner outboard lower-unit water pump applications. This OEM impeller replaces earlier 16154-series impeller references and is commonly used on small 2HP-6HP Mercury outboards.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM water pump impeller

• Designed for selected small Mercury / Mariner outboard pump assemblies

• Used on 2HP, 2.2HP, 3.3HP, 4HP, 5HP and 6HP small outboard applications

• Direct replacement for earlier 47-16154 and 47-161543 references

• Helps restore correct cooling-water pressure and pump priming

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 47-8M0204676 → Supersedes 47-161543

• 47-161543 → Supersedes 47-16154

• 47-16154 earlier OEM reference

OEM / Related Numbers:

• 47-8M0204676

• 8M0204676

• 478M0204676

• 47-161543

• 161543

• 47-16154

• 16154

Aftermarket / Verified Equivalents:

• Sierra: 18-3098

• Mallory: 9-45302

• REC: REC47-161543

🚤 Compatibility

Commonly used on:

• Mercury / Mariner small outboard lower-unit water pump assemblies

• Small 2-stroke carburetted outboard cooling systems

Typically suits:

• Engine models:

• Mercury 2HP 2-Stroke small outboard applications using 47-16154-series impeller

• Mercury 2.2HP 2-Stroke small outboard applications using 47-16154-series impeller

• Mercury 3.3HP 2-Stroke with shift, serial D901217 and up

• Mercury 4HP 1-Cylinder, serial A809601 and up

• Mercury 5HP 1-Cylinder, serial A809601 and up

• Mercury 6HP 2-Stroke small outboard applications using 47-16154-series impeller

• Mariner 2HP / 2.2HP / 3.3HP small 2-stroke applications using the matching Mercury pump assembly

• Mariner 4HP / 5HP / 6HP small 2-stroke applications using the matching Mercury pump assembly

• HP Range: 2HP - 6HP

• Engine Type: Mercury / Mariner small 2-stroke outboard lower-unit water pump system

• Year Range: Application dependent by serial number and lower-unit pump configuration

🔌 Function

The impeller rotates inside the lower-unit water pump housing to draw cooling water into the engine. Correct impeller fitment is critical on small outboards because worn or incorrectly sized impellers can quickly reduce water flow and cause overheating.

Common signs of failure:

• Weak or no tell-tale water stream

• Engine overheating at idle

• Pump not priming after storage

• Cracked, stiff or missing impeller vanes

• Reduced cooling-water pressure

• Rubber fragments in cooling passages

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging