21416784 Level Sensor | Genuine Volvo Penta Part

🔧 Product Description

Coolant level sensor installed in the expansion tank used on specified Volvo Penta D11 marine engines. The sensor is supplied as part of expansion tank assembly 21505289 and provides the engine monitoring system with a low-coolant warning signal.

🚤 Compatibility

• Engine Family: D

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta expansion-tank level sensor
• Integrated with expansion tank assembly 21505289
• Provides low-coolant warning input to the engine control system
• Sealed sensor connection for marine engine compartments
• Electrical sensor requiring full diagnostic coverage
• Engine type: Volvo Penta D11 inline six-cylinder marine diesel

🔌 Function

Detects when coolant in the expansion tank falls below the calibrated level and sends a warning signal to protect the engine from coolant loss and overheating.

⚠️ Common Signs of Failure

• False low-coolant warning with correct level
• No warning when coolant level is low
• Intermittent warning caused by connector or wiring faults
• Corrosion or coolant ingress at the sensor terminals
• Sensor remains open or shorted during electrical testing

🛠️ Service Notes

• Note the wiring and the sensor's orientation before removal, and isolate the circuit so nothing is live while the sender is out
• Check the float or probe moves freely through its full travel before fitting, and that nothing inside the tank or reservoir can foul it
• Seal the thread or flange as the installation specifies, and be sparing with sealant on a sender that earths through its body — an insulated sender reads nothing at all
• Do not over-tighten; these are thin-walled sensor bodies going into thin-walled tanks and housings
• Prove the installation end to end afterwards, confirming the gauge or alarm responds correctly at both ends of the range rather than assuming a new part must be good

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21505289 - expansion tank assembly containing the sensor

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D13C3-B MH, D13C1-B MH, D13C1-A MP, D13C2-A MP, D13C4-A MP, D13B-A MP, D13B-H MP, D13B-G MP, D13B-L MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-K MP, D13B-N MH, D13B-N MH (FE), D13B-B MP, D13B-D MP, D13B-J MP, D13B-M MP, D13B-C MP, D13C6-A MP, D13C1-A MH, D13C1-A MG
• Volvo Penta D9A2J, D9A2G, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2A, D9A2C, D9A2E
• Volvo Penta D11A-A, D11A-B, D11A-C, D11A-E, D11A-C MP, D11A-D MP