4789980 Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump Impeller - Part Number: 47-89980

Genuine Quicksilver/Mercury water pump impeller for selected vintage Mercury and Mariner small outboard lower-unit water pump assemblies. This OEM impeller is designed for the correct small-outboard pump shaft and helps restore proper cooling-water flow through the gearcase water pump.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM water pump impeller

• Designed for selected vintage Mercury and Mariner small outboards

• Used in lower-unit water pump assemblies on smaller 2-stroke models

• Helps restore correct cooling-water pressure and tell-tale flow

• Direct replacement for matching 89980-series Mercury impeller applications

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 47-89980

• 47-68988 earlier related Mercury impeller reference

OEM / Related Numbers:

• 47-89980

• 89980

• 4789980

• 47-68988

• 68988

• 89980B

Aftermarket / Verified Equivalents:

• Sierra: 18-3054

• REC: REC47-89980

🚤 Compatibility

Commonly used on:

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

Typically suits:

• Engine models:

• Mercury / Mariner 3.5HP 2-Stroke small outboard water pump applications

• Mercury / Mariner 3.6HP 2-Stroke small outboard water pump applications

• Mercury / Mariner 4HP 2-Stroke small outboard water pump applications

• Mercury / Mariner 4.5HP 2-Stroke small outboard water pump applications

• Mercury / Mariner 7.5HP 2-Stroke small outboard water pump applications

• Mercury / Mariner 9.8HP 2-Stroke small outboard water pump applications

• HP Range: 3.5HP - 9.8HP

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

• Year Range: Application dependent; commonly used on older Mercury / Mariner small outboard pump assemblies where the 47-89980 impeller size is specified

🔌 Function

The impeller rotates inside the lower-unit water pump housing to draw cooling water through the gearcase and push it into the engine cooling passages. Correct impeller size is important on these smaller outboards because the 47-89980 and 47-89981 applications use different shaft/bore configurations.

Common signs of failure:

• Weak or inconsistent tell-tale water stream

• Engine overheating at idle or low speed

• Cracked, stiff or missing impeller vanes

• Reduced cooling-water pressure after storage

• Pump not priming correctly

• Rubber fragments found in the cooling system

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging