Volvo Penta Heat Exchanger / Aftercooler O-Ring 3581070 | D2 D3 Diesel OEM
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Volvo Penta OEM O-Ring – Part No. 3581070
Part Information
- Part Number: 3581070
- Brand: Volvo Penta (Genuine OEM)
- Product Type: O-Ring / Cooling System Seal
- System: Cooling System – Heat Exchanger / Aftercooler
- SKU: 3581070
Compatible Applications
- Volvo Penta D2-50F diesel inboard
- Volvo Penta D2-55 diesel inboard
- Volvo Penta D2-60F diesel inboard
- Volvo Penta D2-75 diesel inboard
- Volvo Penta D3 family diesel inboards (multiple variants)
- Additional compact Volvo Penta diesel applications – confirm via serial number and parts diagram
Serial Number Fitment Notice
Fitment can vary by engine build date, heat exchanger version, and serial number range. Always confirm part number 3581070 against your engine serial number and the correct Volvo Penta cooling system diagram before ordering. Similar O-rings appear in nearby end-cap and stack sealing positions on these engines.
System & Diagram Position
This O-ring seals the end-cap / end-cover interface on the heat exchanger or aftercooler assembly. It is located at the point where the end cover meets the heat exchanger body or cooling stack. On most D2 and D3 applications, multiple O-rings of this type may be required for a complete reseal — check your engine's parts diagram for the exact quantity per assembly.
Specifications
- Material: OEM-spec elastomer (heat and coolant resistant)
- Application: Heat exchanger end-cap / aftercooler sealing
- Quantity Required: Varies by engine and assembly – confirm via parts diagram
- Weight: ~20 g
When to Replace
Replace this O-ring whenever the heat exchanger or aftercooler has been opened for service, or when the original seal shows signs of flattening, hardening, swelling, seepage, or damage during removal. It is also recommended as a routine replacement during periodic cooling system service if the end caps are being removed for inspection or cleaning.
Installation Notes
Clean the sealing grooves thoroughly before installation. Inspect end caps and mating surfaces for corrosion or damage. Lubricate the O-ring lightly with clean coolant or a compatible O-ring lubricant before seating. Do not reuse the original O-ring after removal. On many compact diesel applications, more than one O-ring is required for a complete reseal — order accordingly.
Related Parts
- Volvo Penta Heat Exchanger O-Ring 3580818 – companion heat exchanger seal
- Volvo Penta Heat Exchanger / Oil Cooler O-Ring 3583831
- Volvo Penta Cooling System O-Ring 3583832
- Volvo Penta Thermostat Cooling O-Ring 3586514
- Volvo Penta Heat Exchanger Screw 3858994
- Volvo Penta Heat Exchanger 3861786
- Volvo Penta Raw Water Pump Impeller Kit 21700445 – recommended cooling system service companion
- Volvo Penta Coolant Pump Gasket 862596
Parts Desk Insights
The 3581070 is one of the most commonly overlooked parts during heat exchanger service on D2 and D3 engines. The O-ring itself is inexpensive, but skipping it during a cooling system opening is a frequent cause of callbacks — the original seal rarely survives removal in reusable condition. Best practice is to order this O-ring (and the companion 3580818) before starting any heat exchanger or aftercooler job, so the engine isn't sitting open while you wait on parts.
A common issue: customers order one O-ring when their engine requires two or more for a complete reseal. Check your specific engine's parts diagram for the correct quantity before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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