Volvo Penta OEM Heat Exchanger O-Ring | Part 3580818

Volvo Penta OEM Heat Exchanger O-Ring — Part No. 3580818

Part Number: 3580818
Brand: Volvo Penta
Official Product Type: Gaskets, Seals & O-Rings
System: Cooling System — Heat Exchanger / Oil Cooler Sealing
Diagram Position: Heat exchanger or oil cooler end-cap sealing position — confirm via Volvo Penta parts diagram for your engine serial

This is a genuine Volvo Penta OEM O-ring used in the heat exchanger and oil cooler sealing service of compact Volvo Penta marine diesel engines. The material compound, cross-section diameter, and inner diameter are specific to this application — a generic O-ring matched by size alone may not provide the same resistance to coolant, oil, and heat cycling that the OEM part is designed for.

Compatible Applications

• Volvo Penta D2-50F — heat exchanger / oil cooler sealing
• Volvo Penta D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-55F — heat exchanger / oil cooler sealing
• Volvo Penta MD22L, MD22P — heat exchanger / oil cooler sealing
• Volvo Penta TAMD22P-B — heat exchanger / oil cooler sealing
• Volvo Penta TMD22B, TMD22P-C — heat exchanger / oil cooler sealing
• Other Volvo Penta compact diesel applications where Part No. 3580818 is specified
• Confirm fitment using your engine model and serial number against the Volvo Penta cooling system diagram before ordering

Serial Number Requirement

Fitment can vary by engine version and cooling component revision. Always verify Part No. 3580818 against your engine serial number and the applicable Volvo Penta parts diagram — particularly on MD22 / D2 / TMD22-family engines where cooling component configurations can differ between production ranges.

Dimensions & Weight

• Weight: Approximately 0.05 kg (estimated — includes packaging)
• Exact O-ring dimensions (ID, cross-section): confirm via Volvo Penta parts diagram for your engine serial

Supersession

Order using Part No. 3580818 as the active number. No confirmed supersession or replacement part number has been identified in current Volvo Penta catalog data. If a supersession exists for your engine serial, it will appear in the official Volvo Penta parts lookup.

Service Interval

Replace this O-ring any time the heat exchanger, oil cooler, or end-cap assembly is removed during service. O-rings are single-use components — once compressed and disturbed, they should not be reused. Replace as part of any heat exchanger cleaning, oil cooler service, or cooling system overhaul where the sealed joint is opened.

Installation Notes

Clean the sealing groove and mating surface thoroughly before installation. Inspect for corrosion, scoring, or debris that could prevent proper seating. Lightly lubricate the O-ring with clean coolant or the appropriate Volvo Penta-approved lubricant before installation to prevent tearing during assembly. Do not stretch or twist the O-ring during fitting. Confirm the sealing location matches the diagram position for your engine serial before reassembly.

Related Parts

Customers servicing the heat exchanger or cooling system alongside this O-ring often need:

• Volvo Penta Thermostat Cooling O-Ring 3586514
• Volvo Penta Thermostat 3587597
• Volvo Penta Thermostat 21437904
• Volvo Penta Thermostat Kit 3831426
• Volvo Penta Thermostat Kit 3831424
• Volvo Penta End Cover 22369744
• Volvo Penta OEM Water Pump Gasket 3580576

Technical FAQ

Can I substitute a generic O-ring by measuring the original?
Not recommended. O-ring material compound affects resistance to coolant, oil, and heat cycling — a ring that matches the dimensions but uses the wrong compound can swell, harden, or fail prematurely in a marine cooling application. OEM replacement is the safest approach.

How do I confirm this is the right O-ring for my engine?
Use your engine model and serial number to locate the correct Volvo Penta cooling system diagram. Find the heat exchanger or oil cooler assembly and confirm that Part No. 3580818 appears at the sealing position you are servicing. If a different number appears, use that number instead.

Should I replace all O-rings in the heat exchanger at the same time?
Yes, if the heat exchanger is being fully disassembled for cleaning or service. Replacing all seals at once avoids a repeat teardown if an adjacent O-ring fails shortly after. Check the Volvo Penta parts diagram for all sealing positions in the assembly and order accordingly.

Parts Desk Insights

The most common issue we see with this part is customers trying to source a generic substitute by measuring the old O-ring — the dimensions might match, but the material compound is what matters in a heat exchanger application where the seal is exposed to both coolant and oil under temperature cycling. The other frequent situation is a single O-ring being replaced while adjacent seals in the same assembly are left in place, leading to a leak from a different position shortly after. Best used as a direct OEM replacement during any heat exchanger cleaning, oil cooler service, or cooling system overhaul on the applicable D2, MD22, or TMD22-family engine — and worth replacing all seals in the assembly at the same time while it’s apart.