21255090 Seawater Pump | Genuine Volvo Penta Part

🔧 Product Description

Genuine raw-water cooling pump used on Volvo Penta 4.3L and 5.0L petrol marine engines equipped with the double V-belt drive arrangement.

🚤 Compatibility

Typically suits:

• Volvo Penta 5.0GL-F
• Volvo Penta 5.0GL-FF
• Volvo Penta 4.3GL-E
• Volvo Penta 4.3GL-EF

⚙️ Key Features

• Genuine Volvo Penta seawater pump assembly
• Double V-groove pulley
• 1-1/4-inch inlet port
• 1-inch outlet port
• Approximately 6-3/4-inch pulley diameter
• Uses service impeller 22307636 or corresponding replacement

🔌 Function

The pump draws seawater through the drive or hull inlet and circulates it through the engine cooling system and exhaust.

⚠️ Common Signs of Failure

• Reduced water discharge
• Water leaking from the shaft seal
• Bearing noise or pulley movement
• Damaged impeller blades
• Seized pump shaft
• Corroded pump housing

🛠️ Service Notes

• Close the seacock before starting work, and make sure it is fully open again before the engine is started
• Never let the pump run dry — an impeller can be ruined in seconds without water, so fill the strainer or pour water into the pump housing to help it pick up prime after fitting
• Renew the O-rings, gaskets and hose clips on refitting, and check the hoses and strainer for perishing, softening and blockage while access is good
• Check drive belt condition and pulley alignment where the pump is belt driven, and turn the engine over by hand before starting to be sure nothing binds
• Start up and confirm a strong, steady discharge with the exhaust water, then check the pump body and joints for weeps and check again after the first proper run

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21255090 → Supersedes 3812520

OEM / Related Numbers

• 3812520 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Impeller: 22307636
• Earlier Impeller References: 21212794, 21213664
• JMP Marine: JPR-VP5090G
• Albinus: 05-01-045
• JMP Impeller: 7136K
• JMP Impeller Reference: 09-812B

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging