4789981 Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump Impeller - Part Number: 47-89981

Genuine Quicksilver/Mercury water pump impeller for selected vintage Mercury and Mariner small outboard lower-unit water pump assemblies. This OEM impeller is the matching 89981-series replacement used on specific 3.9HP-9.8HP applications and supports reliable cooling-water flow through the lower unit.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM water pump impeller

• Designed for selected vintage Mercury / Mariner 3.9HP-9.8HP outboards

• Used in lower-unit water pump assemblies with the matching impeller bore size

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

• Direct replacement for earlier 39074 and 65957 Mercury impeller references

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 47-89981 → Supersedes 47-65957

• 47-65957 → Supersedes 47-39074

• 47-39074 earlier Mercury impeller reference

OEM / Related Numbers:

• 47-89981

• 89981

• 4789981

• 47-65957

• 65957

• 47-39074

• 39074

• 89981B

Aftermarket / Verified Equivalents:

• Sierra: 18-3039

• Mallory: 9-45305

• GLM: 89810

• REC: REC47-89981

🚤 Compatibility

Commonly used on:

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

Typically suits:

• Engine models:

• Mercury 3.9HP 1-Cylinder, serial number 2278851 and up where fitted with the 47-89981 pump assembly

• Mercury 4HP 1-Cylinder USA models using 47-89981 impeller

• Mercury 4HP Model 40 1-Cylinder, serial range 2498136 - 3296136

• Mercury 4.5HP 1-Cylinder applications using the matching 47-89981 impeller

• Mercury 7.5HP / Model 75 2-Stroke carbureted applications using 47-89981 gear housing impeller

• Mercury 9.8HP / Merc 110 2-Stroke applications using the matching 47-89981 impeller

• Mariner 4HP / 4.5HP / 7.5HP / 9.8HP small 2-stroke applications using the matching 47-89981 water pump impeller

• HP Range: 3.9HP - 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 water pump assemblies by serial and pump configuration

🔌 Function

The impeller pumps cooling water from the gearcase into the engine cooling passages. This impeller must be matched to the correct pump shaft and housing configuration to avoid poor priming, low water pressure or premature impeller wear.

Common signs of failure:

• Weak tell-tale water stream

• Overheating at idle or low speed

• Impeller vanes cracked, hardened or missing

• Pump not priming after service

• Reduced cooling-water pressure

• Rubber fragments found in cooling passages

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging