21147880 Engine Heater | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta engine coolant heater for TAD740GE, TAD741GE and TWD740GE installations. The heater warms the engine coolant before starting to improve cold-start performance, reduce white smoke and shorten the time required to reach stable operating temperature.

⚙️ Key Features

• Genuine Volvo Penta engine coolant heater
• Confirmed TAD740GE, TAD741GE and TWD740GE fitment
• Supersedes earlier heater 866586
• Installed in the engine cooling circuit
• Electrical rating and connection must match the original heater and regional supply voltage
• Engine type: Volvo Penta 7-litre inline-six industrial diesel

🔌 Function

Adds heat to the engine coolant before starting so the cylinder block and combustion chambers begin closer to operating temperature.

⚠️ Common Signs of Failure

• Heater remains cold when energised
• Repeated tripping of the supply breaker or blown fuse
• Coolant leakage around the heater seal or body
• Damaged cable, plug or electrical insulation
• Hard cold starting and excessive white smoke despite normal fuel and compression

🛠️ Service Notes

• The cooling system must be filled and properly vented before the heater is switched on — energising the element in a dry or air-locked jacket will burn it out
• Isolate the shore supply and let the engine cool before removing or fitting a heater, and drain enough coolant to work below the heater opening
• Renew the sealing ring or gasket at the opening and tighten to the figure in the workshop manual for your engine
• Inspect the element for scale and the housing for corrosion; a heavily scaled element runs hot and will fail again
• Have the electrical connection made off correctly and protected, fed from a properly earthed and protected shore supply, and check the cable and connector for damage each season

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21147880 → Supersedes 866586

OEM / Related Numbers

• 866586 earlier number superseded by this part

📦 Condition

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