Description

Volvo Penta 1542591 is a genuine OEM pressure cap used on Volvo Penta cooling-system applications. Volvo Penta’s official parts shop lists 1542591 as an active genuine pressure cap, and current reviewed dealer references identify it more specifically as an expansion / header tank pressure cap. Current reviewed public sources do not publish a confirmed pressure rating, diameter, or cap-neck dimension for this exact OEM number.

Key Features

• Genuine Volvo Penta OEM part number 1542591.
• Used as an expansion / header tank pressure cap in the cooling system.
• Individual service cap sold separately rather than as part of a kit.
• Current reviewed public sources do not provide a reliable OEM pressure-spec or dimensional listing for this exact number.

Engine Compatibility
Current public sources confirm the OEM number clearly, but they are stronger on the cooling-system function than on a broad official marine engine fitment list. The clearest reviewed descriptions identify 1542591 as a Volvo Penta engine expansion/header tank pressure cap, so fitment should be confirmed by exact engine serial number and by matching the existing cap and tank neck before ordering.

Serial Number Fitment Notice
Pressure caps can vary by cap height, locking tabs, pressure setting, and tank-neck design. Confirm Volvo Penta 1542591 by engine serial number and by matching the original cooling-system cap before ordering. Volvo Penta’s parts guidance also directs owners to identify the correct engine, shield, or drive when locating genuine parts.

When This Part Needs Replacement
Replace this cap when the original seal is hardened or damaged, the spring tension is weak, the cap no longer holds pressure correctly, or there are visible signs of leakage or cooling-system loss around the expansion tank neck. Because current reviewed sources identify 1542591 specifically as an expansion/header tank pressure cap, replacement is typically tied to cooling-system sealing and pressure-control issues.

Installation Notes
Install only after confirming the exact cap style and cooling-system application. Compare the replacement directly to the original cap and inspect the tank neck and sealing surfaces during service. Since current public references confirm the part number more clearly than they publish full specs, serial-number verification and direct comparison remain the safest checkpoints before installation.

Alternate/Superseded Part Numbers
Current reviewed aftermarket-equivalent references show Orbitrade 15591 as a replacement part for Volvo Penta 1542591. Current confirmed Volvo Penta ordering number is 1542591.

Parts Desk Insight
For cooling-system caps like 1542591, the strongest buying checkpoint is the exact tank neck and cap style, not the word “pressure cap” alone. Current reviewed sources point clearly to expansion/header tank use, so matching the original cap and confirming by serial number is the cleanest way to avoid ordering the wrong cap.

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