Volvo Penta Thermostat Cooling O-Ring 3583830

Volvo Penta 3583830 is a genuine OEM O-ring used in Volvo Penta cooling-system service. Current fitment trails support this seal in compact Volvo Penta diesel applications, with the strongest public evidence pointing to thermostat and cooling-system sealing use on D1, D2, D4, and D6 engine families, depending on the exact serial-number-based application. Current parts references also show earlier number 888623 updating to 3583830.

Key Features

• Genuine Volvo Penta OEM O-ring, part number 3583830.
• Used in Volvo Penta cooling-system sealing applications.
• Strong current fitment trail includes D1, D2, D4, and D6 diesel platforms, depending on the exact engine and diagram position.
• Current supersession references show 888623 updated to 3583830.

Engine Compatibility

The strongest supportable fitment trail for Volvo Penta 3583830 is with Volvo Penta diesel cooling-system applications. Current public references specifically associate it with D1-13, D1-20, D1-30, D2-40, D2-55, plus a broader set of D4 and D6 diesel models. Because O-rings like this can be used in more than one nearby cooling-system position depending on engine family and revision, the safest fitment standard is the exact Volvo Penta serial-number-based parts diagram for the engine being serviced.

Serial Number Fitment Notice

Fitment can vary by engine family, thermostat housing, and cooling-system revision. Confirm Volvo Penta part number 3583830 against your engine serial number and the correct Volvo Penta cooling-system diagram before ordering, especially where similar O-rings appear in nearby thermostat or cooling-stack positions. The current public fitment trail is broad enough that serial-number verification matters on this one.

When This Part Needs Replacement

Replace this O-ring whenever the thermostat housing or related cooling-system connection has been opened, or when the original seal shows flattening, hardening, swelling, seepage, or damage during removal. It is also a smart replacement during routine cooling-system service because small seals like this are much cheaper to renew while the assembly is already apart. This replacement guidance is based on the part type and the current cooling-system fitment trail.

Installation Notes

Match this O-ring to the exact Volvo Penta application before installation. The strongest current references support thermostat and cooling-system use, so confirming both the part number and exact diagram position is the safest cross-check before ordering or reassembly. Clean the groove and sealing surfaces carefully, and avoid reusing an old compressed seal if the cooling assembly has already been opened.

Alternate/Superseded Part Numbers

Current parts references show 888623 as an earlier number updated to 3583830. Use 3583830 as the current primary OEM ordering number for this listing.

Parts Desk Insight

Small cooling-system O-rings are easy to underestimate because they look simple on the bench. On Volvo Penta diesel engines, matching the exact serial-number-based diagram first is usually much safer than trying to compare an old seal by diameter alone.

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