17251612 Pressure Cap | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta pressure cap for the cooling system, sealing the system and holding it at its designed operating pressure. It is listed for TAD-series industrial diesel engines. A pressure cap that no longer holds its rating lowers the coolant boiling point and risks overheating.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD1643VE-B
• Volvo Penta TAD1640-42GE-B
• Volvo Penta TAD1640VE-B
• Volvo Penta TAD1641VE-B
• Volvo Penta TAD1642VE-B
• Volvo Penta TAD1641VE
• Volvo Penta TAD1642VE
• Volvo Penta TAD1643VE
• Volvo Penta TAD1650VE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TAD1640-42VE-C

• Engine Family: TAD

⚙️ Key Features

• Pressure-regulating coolant cap
• Used on selected Volvo Penta industrial cooling systems
• Includes pressure and vacuum-valve functions
• Maintains cooling-system pressure and coolant recovery
• Pressure rating and filler-neck profile must match the original tank
• Engine type: Application dependent

🔌 Function

The pressure cap seals the cooling system and holds it at a set pressure, which raises the coolant's boiling point. It also releases above that pressure and admits air back as the system cools, protecting against both over-pressure and vacuum.

⚠️ Common Signs of Failure

• Coolant loss or overflow with no visible external leak
• Overheating or coolant boiling at normal operating temperature
• Perished, swollen or damaged cap seal
• Weak, seized or corroded pressure relief spring
• Hoses collapsing on cooldown, indicating the vacuum valve is not opening

🛠️ Service Notes

• Only ever remove a pressure cap on a cold system; hot coolant under pressure comes out at you
• Fit the cap specified for your engine — its pressure rating is part of the cooling system design, and a cap that vents at the wrong pressure causes overheating or collapsed hoses
• Check the seat in the filler neck is clean and undamaged first, as a good cap cannot seal against a corroded or distorted seat
• Fit the cap right home to its stop so both the pressure valve and the vacuum valve can work as intended
• When hoses collapse or the level in the expansion tank swings and never returns, suspect the cap's vacuum valve before chasing bigger faults

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 17214674 - related expansion-tank reference where specified

📦 Condition

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