21664189 Filler Cap | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta TAD7 Cooling-System Filler Cap - Part Number: 21664189

A pressure-rated coolant filler cap used on the designated TAD7 radiator or expansion-tank cooling package.

⚙️ Key Features

• Cooling-system pressure cap

• Controls pressure and vacuum recovery

• Heat- and coolant-resistant sealing element

• Correct filler-neck locking profile

• Designed for heavy-duty generating-set service

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Current OEM reference: 21664189

OEM / Related Numbers:

• 21664189

• 21661750 - Related expansion tank

• 21661739 / 21883422 - Related radiators

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

• Volvo Penta TAD7 radiator and expansion-tank systems specifying cap 21664189

• Cap pressure rating and filler-neck profile must match the cooling package

🔌 Function

The cap seals the cooling system, maintains operating pressure and allows controlled coolant recovery as the engine cools.

Common signs of failure or damage:

• Coolant venting at normal temperature

• Pressure not retained

• Hardened or cracked seal

• Cap difficult to lock

• Repeated coolant loss

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging