Description

Volvo Penta 125017 is a genuine OEM O-ring used in multiple Volvo Penta marine installations. Volvo Penta’s official parts shop lists 125017 as an active genuine O-ring and notes that it “can be used in multiple installations,” which makes it best presented as a general sealing O-ring for engine and drive service where exact part-number matching matters.

Key Features

• Genuine Volvo Penta OEM part number 125017.
• Individual O-ring service part, sold separately rather than as a kit.
• Current reviewed sources describe it as a sealing component used to help prevent leaks in engine and drive systems.
• Current aftermarket cross-reference listings associate Volvo Penta 125017 with Sierra 18-7178.

Engine Compatibility
Current public references confirm the OEM number clearly, but the broadest current application language points to use across engine, cooling, pump, fuel, and driveline sealing points rather than one single engine family. One current fitment source shows very wide Volvo Penta compatibility, including AQ and 100S/110S families among many others, while Volvo Penta’s own listing keeps the application general. Fitment should be confirmed by exact engine or drive serial number and by matching the original O-ring location before ordering.

Serial Number Fitment Notice
O-rings can vary by inside diameter, cross-section, material, and the exact sealing groove where they are used. Confirm Volvo Penta 125017 by engine or drive serial number and by matching the original O-ring dimensions and installed location before ordering. Volvo Penta’s current parts guidance also directs owners to identify the correct engine, shield, or drive when locating genuine parts.

When This Part Needs Replacement
Replace this O-ring whenever the related component is removed for service, or when the original shows flattening, hardening, cracking, swelling, seepage, or loss of sealing tension. Because current reviewed references describe 125017 as a general sealing O-ring used across engine and drive systems, renewing it during disassembly is the right service practice for reliable reassembly.

Installation Notes
Install only on clean sealing surfaces and compare the new O-ring directly to the original before final assembly. A light application of the correct assembly lubricant can help prevent twisting or pinching during installation where appropriate for the system being serviced. Since Volvo Penta’s public listing confirms the part number more clearly than the exact installed location, serial-number verification and direct comparison to the removed seal are the safest checkpoints.

Alternate/Superseded Part Numbers
Current reviewed aftermarket interchange references connect Volvo Penta 125017 with Sierra 18-7178, GLM 82130, and Mallory 9-76555 in the same O-ring application family. Current confirmed Volvo Penta ordering number is 125017.

Parts Desk Insight
For small sealing parts like 125017, the strongest buying checkpoint is the exact groove and O-ring size, not appearance alone. Current references show that this number is used broadly enough that serial-number confirmation and direct size matching are the cleanest way to avoid ordering the wrong O-ring for the job.

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