3580778 Water Pump | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta water pump from the Cooling System group, weighing 5.067 kg and listed for six applications across TMD, AD, TAMD and MD series engines. It supersedes part number 860785.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD31A
• Volvo Penta TMD31B
• Volvo Penta AD31B
• Volvo Penta TAMD31A
• Volvo Penta TAMD31B
• Volvo Penta MD31A

• Engine Family: TMD, AD, TAMD, MD

⚙️ Key Features

• 5.067 kg
• Supersedes 860785
• Six applications across four engine series

🔌 Function

Circulates coolant through the engine and heat exchanger circuit.

⚠️ Common Signs of Failure

• Overheating with the thermostat and heat exchanger proved good
• Weeping from the pump seal or weep hole
• Bearing noise or roughness when turned by hand
• Play felt at the pulley or impeller
• Coolant staining below the pump

🛠️ Service Notes

• Six water pumps appear in this run between 4.8 and 5.8 kg — the superseded number is the reliable guide
• A weep hole that drips is the pump seal telling you it has failed; do not simply retighten the belt

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3580778 → Supersedes 860785 → Supersedes 859126 → Supersedes 858485

OEM / Related Numbers

• 860785 earlier number superseded by this part
• 859126 earlier number superseded by this part
• 858485 earlier number superseded by this part

📦 Condition

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