430232 Mercury Tube Seal | Genuine Used Part

🔧 Product Description

Genuine Mercury Water Pump Tube Seal - Part Number: 430232

A genuine used Mercury moulded water-tube seal installed in the lower-unit water-pump assembly. The seal closes the connection between the water-pump housing or guide and the copper cooling-water tube leading into the engine midsection.

Correct sealing at this joint allows the impeller to deliver pressurised cooling water into the powerhead without leakage or air entering around the tube.

⚙️ Key Features

• Genuine Mercury water-pump tube seal
• Correct part number 430232
• Also formatted as Mercury 43023-2
• Used in lower-unit water-pump assemblies from approximately 30HP to 125HP
• Cross-references with Sierra, GLM and SEI replacement seals

🚤 Compatibility

Commonly used on

• Mercury and Mariner outboard lower-unit water pumps
• Gearcases using the 43026-series impeller and 430232 water-tube seal
• Two-stroke, four-stroke, EFI, Jet and OptiMax gearcases where the water-pump diagram specifies 430232

Typically suits

• Engine models:
• Mercury / Mariner 30HP outboards using the 43026-series water pump
• Mercury / Mariner 35HP outboards using seal 430232
• Mercury / Mariner 40HP 2-cylinder, 3-cylinder and 4-cylinder gearcases
• Mercury / Mariner 45HP and 50HP gearcases using seal 430232
• Mercury / Mariner 55HP and 60HP gearcases using seal 430232
• Mercury 65 Jet and Mercury / Mariner 70HP gearcases
• Mercury / Mariner 75HP 3-cylinder and four-stroke gearcases
• Mercury / Mariner 75HP four-stroke - serial 0G960500 to 0T800999
• Mercury 80 Jet and Mercury / Mariner 90HP gearcases
• Mercury / Mariner 100HP, 115HP and 125HP gearcases using seal 430232
• Mercury 115 OptiMax gearcases where the serial-numbered water-pump diagram specifies 430232
• HP Range: Approximately 30HP - 125HP
• Engine Type: Mercury / Mariner outboard lower-unit cooling system
• Year Range: Approximately mid-1980s through the 2010s, dependent on gearcase

🔌 Function

The seal directs all output from the water-pump housing into the engine water tube. It prevents pressure loss at the pump outlet and helps the impeller maintain reliable cooling-water delivery.

⚠️ Common Signs of Failure

• Weak tell-tale or exhaust-water flow
• Engine overheats despite a serviceable impeller
• Water leaks around the pump-to-tube connection
• Seal becomes split, hardened, distorted or displaced
• Water tube does not remain centred in the pump outlet

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 430232 current original Mercury seal reference
• 43023-2 formatted Mercury reference

OEM / Related Numbers

• 430232
• 43023-2
• 43023
• 27-430331 - Related water-pump gasket
• 47-43026T2 - Related impeller
• 26-43036 - Related driveshaft oil seal
• 26-43035 - Related oil seal
• 3044-2501 / 30442501 - Cross-reference number
• 62-4899 - Cross-reference number

Aftermarket / Verified Equivalents

• Sierra: 18-1838
• GLM: 85190
• SEI Marine: 96-205-12E
• Aftermarket seal referencing Mercury 430232 / 43023-2

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated