803751 Mercury MerCruiser Liner Water Pump | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Pump Liner - Part Number: 803751

Genuine Quicksilver/Mercury stainless steel water pump cup liner for selected Mercury and Mariner small outboard water pump housings. This OEM liner is used inside the 803750A02-style water pump housing to provide the correct wear surface for the impeller.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM water pump liner

• Stainless steel cup liner for lower-unit water pump housing

• Used with 803750A02 water pump housing applications

• Helps restore correct impeller sealing and pump efficiency

• Designed for selected 6HP, 8HP, 9.8HP and 9.9HP outboards

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 803751

• 803751 1 related listing reference

OEM / Related Numbers:

• 803751

• 8037511

• 803751 1

• 803750A02 related water pump housing

• Tohatsu: 350-65011-1 related liner reference

Aftermarket / Verified Equivalents:

• Tohatsu / Nissan: 350-65011-1

• Aftermarket liner equivalents available where matched to 803750A02 pump housing

🚤 Compatibility

Commonly used on:

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

• Water pump housings using the 803750A02 liner-style cup

• Mercury / Tohatsu-built small outboard pump assemblies

Typically suits:

• Engine models:

• Mercury / Mariner 6HP outboards using 803750A02 water pump housing

• Mercury / Mariner 8HP outboards using 803750A02 water pump housing

• Mercury / Mariner 9.8HP outboards using 803750A02 water pump housing

• Mercury / Mariner 9.9HP outboards using 803750A02 water pump housing

• Tohatsu / Nissan small outboard applications using 350-65011-1 liner reference

• Mercury / Mariner service applications where 803751 liner is specified in the gearcase water pump parts diagram

• HP Range: 6HP - 9.9HP

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

• Year Range: Application dependent by serial number and 803750A02 water pump housing fitment

🔌 Function

The water pump liner forms the stainless wear surface inside the pump housing where the impeller rotates. A good liner helps the impeller seal correctly, maintain water pressure and pump cooling water efficiently.

Common signs of failure:

• Weak or inconsistent tell-tale water stream

• Poor water pressure after impeller replacement

• Scored, worn or distorted liner surface

• Engine overheating at idle or low speed

• Pump not priming correctly

• Visible grooves or corrosion inside the pump cup

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging