21282005 Water Pump | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta engine-coolant circulation pump for MD22-family marine diesels. It replaces earlier pump references 861578 and 859774 and circulates fresh coolant through the cylinder block, cylinder head and heat exchanger.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD22A
• Volvo Penta TMD22B
• Volvo Penta TMD22P-C
• Volvo Penta TAMD22P-B
• Volvo Penta MD22A
• Volvo Penta MD22L
• Volvo Penta MD22P

• Engine Family: TMD, TAMD, MD

⚙️ Key Features

• Genuine Volvo Penta coolant circulation pump
• Confirmed MD22-family application
• Supersedes 861578 and 859774
• Complete pump housing, shaft, bearing and impeller assembly
• Engine type: Volvo Penta MD22 four-cylinder marine diesel

🔌 Function

Circulates fresh coolant through the engine and heat exchanger to control operating temperature.

⚠️ Common Signs of Failure

• Coolant leakage from the seal or housing
• Overheating despite correct coolant level
• Bearing noise, shaft play or pulley wobble
• Reduced circulation caused by impeller damage or corrosion
• Repeated temperature alarms at sustained load

🛠️ Service Notes

• Drain coolant to below the pump, and note the belt routing and hose positions before the old pump comes off
• Clean the mounting face back to bare metal without scoring it, and fit new gaskets or O-rings — a pump will not seal onto old gasket remains
• Turn the new pump by hand before fitting to confirm it runs smooth and free, and handle it by the housing rather than by the impeller or shaft
• Tighten the mounting bolts evenly to the figure in the workshop manual, then set belt tension by the procedure for your engine; an overtensioned belt is the usual reason a pump has a short life
• Refill and vent the cooling system, run the engine to temperature, and check for coolant at the weep hole and around the mounting face

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21282005 → Supersedes 861578 → Supersedes 859774

OEM / Related Numbers

• 861578 earlier number superseded by this part
• 859774 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Crom Marine: 115279

📦 Condition

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