Volvo Penta D3 Turbocharger Oil Return Sealing Ring 31251439 | OEM
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Part Information
- Part Number: 31251439
- Brand: Volvo Penta
- Official Product Type: Sealing Ring — Turbocharger Oil Return / Drain Connection
- Supersedes: 30637866, 1397775, 8670312
- Replaced By: No current supersession on record
- Diagram Position: D3 Inlet / Exhaust System — Turbocharger oil-return pipe connection, alongside exhaust manifold components
Overview
The Volvo Penta 31251439 is a genuine OEM metal sealing ring used at the turbocharger oil-return (drain) connection on Volvo Penta D3 marine diesel engines. It seals the oil-return pipe where it connects to the turbocharger, preventing oil seepage at this junction. This seal is specific to the turbocharger oil-return circuit — it is not a sterndrive, propeller-shaft, or general engine seal. It supersedes earlier references 30637866, 1397775, and 8670312.
Compatible Applications
- Volvo Penta D3-110I
- Volvo Penta D3-130A / D3-130I
- Volvo Penta D3-140A / D3-140I
- Volvo Penta D3-150I
- Volvo Penta D3-160A / D3-160I
- Volvo Penta D3-170A / D3-170I
- Volvo Penta D3-200A / D3-200I
- Volvo Penta D3-220A / D3-220I
Confirm your complete engine model and serial number against the Volvo Penta D3 inlet / exhaust system diagram before ordering. Several gaskets and sealing rings are used around the turbocharger oil-pressure and oil-return connections — verify the exact diagram position before ordering.
Serial Number Requirements
Always confirm your engine model and serial number using the Volvo Penta D3 inlet and exhaust system parts diagram. Multiple seals are used in close proximity around the turbocharger oil connections — matching the exact diagram position is the most reliable way to ensure you order the correct seal.
System
Exhaust / Turbocharger System — Turbocharger Oil Return (Drain) Connection
Related Parts — D3 Turbocharger Assembly
The following components are part of the D3 turbocharger assembly and should be inspected during sealing ring service:
- Turbocharger — 3847392
- Oil Pressure Pipe — 3584290
- Oil Return Pipe — 3584289
- Plane Gasket — 420641
- Exhaust Manifold — 3812601
- Gasket — 30729340
- Previous Sealing Ring — 30637866 (superseded by 31251439)
Dimensions & Weight
- Weight: Approximately 0.05 kg
- Ring dimensions per Volvo Penta D3 turbocharger oil-return assembly specification
When This Part Needs Replacement
Replace the sealing ring whenever the turbocharger oil-return connection is separated for service, or if inspection reveals any of the following:
- Oil seepage around the return pipe connection
- Visible flattening, deformation, or surface damage to the ring
- Loss of sealing tension
- Leakage following turbocharger or exhaust manifold service
Metal sealing rings should always be replaced rather than reused once disturbed.
Installation Notes
Install the new sealing ring on clean, undamaged mating surfaces. Verify that the oil-return pipe is correctly aligned before tightening the associated hardware. Inspect the oil-return pipe, pressure pipe, and surrounding turbocharger fittings for corrosion or damage during service.
Technical FAQ
Q: What superseded part numbers does 31251439 replace?
A: 31251439 supersedes earlier references 30637866, 1397775, and 8670312. Always order by the current active OEM number.
Q: Is this the same as a sterndrive or shaft seal?
A: No. This is a metal sealing ring specific to the turbocharger oil-return connection in the D3 inlet and exhaust system. It is not a sterndrive, propeller-shaft, or general engine seal.
Q: Are there other seals in the same turbocharger area?
A: Yes — several gaskets and sealing rings are used around the turbocharger oil-pressure and oil-return connections. Confirm the exact diagram position before ordering to ensure you get the correct seal for your specific connection point.
Q: Should I replace this seal every time I remove the turbocharger?
A: Yes. Metal sealing rings should always be replaced when the connection is disturbed. Reusing a compressed or deformed ring risks oil seepage after reassembly.
Parts Desk Insights
This seal is easy to overlook during turbocharger service because it’s small and inexpensive, but oil seepage at the return connection is a common post-service issue when it’s reused or forgotten. It’s worth including it automatically any time a customer orders turbocharger or oil-return pipe parts for the D3. The most common confusion is customers searching for a “turbocharger seal” and landing on sterndrive or shaft seals — this part is specific to the oil-return drain connection in the D3 inlet and exhaust assembly.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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