21493463 Check Valve | Genuine Volvo Penta Part

🔧 Product Description

A genuine one-way coolant valve used in the optional engine-heater installation on Volvo Penta D3 marine diesel engines. The valve controls coolant direction through the heater circuit, helping the heater circulate warmed coolant through the engine while preventing reverse flow after the heater is switched off.

🚤 Compatibility

• Engine Family: D
• HP Range: 110-220 HP
• Year Range: Approximately 2010 - 2020

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta coolant-system check valve
• One-way design maintains the intended flow direction
• Used as item 7 in engine-heater installation 21493436
• Direct-fit threaded and hose-connected construction
• Suitable for replacement of a leaking, sticking or restricted original valve
• Engine type: 2.4L inline five-cylinder common-rail marine diesel

🔌 Function

Allows coolant to move through the engine-heater circuit in the intended direction and closes against reverse flow. Correct operation supports dependable preheating, even coolant distribution and reduced cold-start wear.

⚠️ Common Signs of Failure

• Engine heater operates but the engine warms slowly
• Coolant circulates in the wrong direction or drains back
• Restricted flow caused by an internally sticking valve
• Coolant seepage around the valve body or hose connections
• Uneven engine temperature after heater operation

🛠️ Service Notes

• Note which way round the valve sits before removing it and fit the replacement the same way — a non-return valve installed backwards will block flow entirely or allow the drain-back it was there to prevent
• Work clean and fit new sealing washers or O-rings on the connections; a small amount of debris is enough to hold a check valve off its seat
• Check the new valve moves freely and seals in the reverse direction before fitting, and blow or flow test it in the correct direction if you are unsure of its orientation
• Hold the valve by its hex or flats when tightening, never by clamping the body, and tighten to the figure given in the workshop manual for your engine
• Run the system afterwards and confirm the symptom has gone as well as that the joints are dry

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21493436 - engine heater kit
• 961657 - hose nipple
• 961665 - hose clamp
• 961669 - hose clamp
• 3581182 - coolant pipe, depending on engine generation
• 22411926 - coolant pipe, depending on engine generation
• 345845 - distribution pipe

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D3-220I-G, D3-140A-D, D3-170A-D, D3-200A-D, D3-220A-D, D3-140I-D, D3-140A-E, D3-170A-E, D3-200A-E, D3-220A-E, D3-140I-E, D3-140A-F, D3-170A-F, D3-200A-F, D3-220A-F, D3-140I-F, D3-140A-G, D3-170A-G, D3-200A-G, D3-220A-G, D3-140I-G, D3-110I-D, D3-150I-D, D3-170I-D, D3-200I-D, D3-220I-D, D3-110I-E, D3-150I-E, D3-170I-E, D3-200I-E, D3-220I-E, D3-110I-F, D3-150I-F, D3-170I-F, D3-200I-F, D3-220I-F, D3-110I-G, D3-150I-G, D3-170I-G, D3-200I-G, D3-110I-H, D3-140A-H, D3-170A-H, D3-200A-H, D3-220A-H, D3-150I-H, D3-170I-H, D3-200I-H, D3-220I-H, D3-140I-H