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

🚤 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

🔄 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

📦 Condition

• Genuine Quicksilver part
• Brand new
• Supplied in original or equivalent packaging