21412647 Thermostat | Genuine Volvo Penta Part

🔧 Product Description

Engine-coolant thermostat with a 76°C opening temperature for specified Volvo Penta D11 marine engines. It controls coolant flow through the engine heat-exchanger circuit and is used across D11A and D11B propulsion variants where the 76°C specification is required.

🚤 Compatibility

Typically suits:

• Volvo Penta D11C1-A MP
• Volvo Penta D11C3-A MP
• Volvo Penta D11C2-A MP
• Volvo Penta D11C4-A MP
• Volvo Penta D11B3-A MP
• Volvo Penta D11B4-A MP
• Volvo Penta D11A-A
• Volvo Penta D11A-B
• Volvo Penta D11A-C
• Volvo Penta D11A-E
• Volvo Penta D11B2-A MP
• Volvo Penta D11A-C MP
• Volvo Penta D11A-D MP
• Volvo Penta D11B1-A MP

• Engine Family: D

⚙️ Key Features

• Genuine Volvo Penta 76°C thermostat
• Designed for D11 marine cooling systems
• Controls warm-up and normal coolant circulation
• Different temperature specification from D9 thermostat 21412646
• Engine type: Volvo Penta D11 inline six-cylinder marine diesel

🔌 Function

Regulates coolant flow so the D11 reaches operating temperature quickly and remains within the intended marine cooling range.

⚠️ Common Signs of Failure

• Engine temperature remains below normal
• Overheating or restricted coolant flow
• Temperature swings during steady operation
• Thermostat stuck open or closed
• Corrosion or damaged sealing surface

🛠️ Service Notes

• Let the engine cool fully and drain coolant to below the housing before opening it, catching what comes out
• Clean both faces of the housing without scoring them, and fit a new gasket or sealing ring with the thermostat — the old seal should never be reused
• Fit the thermostat the right way round, with the sensing element towards the engine and any vent or bleed hole positioned as the original was, and check it is properly seated before the cover goes on
• Pull the housing fasteners down evenly and to the figure in the workshop manual for your engine; an unevenly tightened cover distorts and weeps
• Refill with the specified coolant, vent the system, then run up to temperature and check both for leaks and that the engine reaches and holds its normal running temperature

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21412647 → Supersedes 21264668

OEM / Related Numbers

• 21264668 earlier number superseded by this part
• Related Volvo thermostat family references include 21412642 and 3887780; verify temperature before substitution

Aftermarket / Verified Equivalents

• RECMAR: RM21412647
• Calorstat by Vernet: THS18201.76
• Calorstat by Vernet: THCT18201.76

📦 Condition

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