478993T Mercury MerCruiser Impeller | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump Impeller - Part Number: 47-89983T

Genuine Quicksilver/Mercury water pump impeller for selected Mercury and Mariner 2-stroke outboard lower-unit water pump assemblies. This OEM impeller is designed to restore correct cooling-water flow through the gearcase pump, helping protect the engine from overheating and cooling-system damage.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM water pump impeller

• Designed for selected Mercury and Mariner 35HP-70HP 2-stroke outboards

• 6-blade neoprene impeller for lower-unit cooling-water pump assemblies

• Helps restore correct tell-tale flow and water pressure

• Direct replacement for earlier Mercury 20268, 65959 and 89983 impeller references

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 47-89983T → Supersedes 47-89983

• 47-89983 → Supersedes 47-65959

• 47-65959 → Supersedes 47-20268

• 47-20268 earlier OEM reference

OEM / Related Numbers:

• 47-89983T

• 89983T

• 4789983T

• 47-89983

• 89983

• 47-65959

• 65959

• 47-20268

• 20268

• 47-89983T2 kit/reference association where listed

Aftermarket / Verified Equivalents:

• Sierra: 18-3007

• Mallory: 9-45300

• GLM: 89830

• SEI: 96-264-03

• REC: REC47-89983T

🚤 Compatibility

Commonly used on:

• Mercury / Mariner 2-stroke outboard lower-unit water pump assemblies

• Early Mercury / Mariner 35HP-70HP gearcase cooling systems

Typically suits:

• Engine models:

• Mercury / Mariner 35HP 2-Stroke, serial range 1217222 and up

• Mercury / Mariner 35HP 2-Stroke, 2-cylinder Australian-market application, serial 8005335 and up

• Mercury / Mariner 40HP 2-Stroke, serial range 1224481 - 4860102

• Mercury / Mariner 40HP 2-Stroke Australian-market application, serial range 8005335 - G053313

• Mercury 402 40HP 2-Stroke, serial range 8005335 - G053313

• Mercury / Mariner 45HP 2-Stroke, serial range 1279685 and up

• Mercury / Mariner 45HP 4-Cylinder Australian-market application, serial 8063985 and up

• Mercury / Mariner 50HP 2-Stroke, serial range 1421113 - 0D000749

• Mercury / Mariner 50HP 4-Cylinder Australian-market application, serial 2863739 and up

• Mercury / Mariner 50HP 3-Cylinder, serial range 62861 - D000749

• Mercury / Mariner 60HP 2-Stroke, serial range 6428681 - 0D000749

• Mercury / Mariner 60HP 3-Cylinder, serial range 62861 - D000749

• Mercury 65HP 2-Stroke, serial range 3293184 - 4571651

• Mercury / Mariner 70HP 2-Stroke, serial range 4571652 - 0B110053

• HP Range: 35HP - 70HP

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

• Year Range: Application dependent, commonly used across earlier 35HP-70HP Mercury/Mariner 2-stroke outboard gearcase assemblies by serial range

🔌 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 system. A correctly functioning impeller is essential for maintaining water pressure, engine temperature control and reliable cooling performance.

Common signs of failure:

• Weak or inconsistent tell-tale water stream

• Engine overheating alarm

• Reduced cooling-water pressure

• Overheating at idle or low speed

• Cracked, hardened, worn or missing impeller blades

• Rubber impeller fragments found in the cooling system

• Pump not priming correctly after storage or service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging