Volvo Penta D3 Oscillation Damper 31258122 | OEM Crankshaft Torsional Damper
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Part Information
- Part Number: 31258122
- Brand: Volvo Penta
- Official Product Type: Oscillation Damper — Crankshaft Torsional Vibration Control
- Supersedes: No supersession on record
- Replaced By: No current supersession on record
- Diagram Position: Object Key 36 — Crank Mechanism / Front Crankshaft & Pulley Assembly (D3-110I-F schematic)
Overview
The Volvo Penta 31258122 is a genuine OEM oscillation damper for Volvo Penta D3 marine diesel engines. It mounts at the front of the crankshaft alongside the crankshaft pulley and is designed to absorb and control torsional vibration generated through the rotating assembly during engine operation. This is a crankshaft-front damper — not a belt tensioner or engine-mount vibration isolator. Keeping this component in good condition is important for protecting the crankshaft, pulley, and front-end accessories from the effects of torsional vibration over time.
Compatible Applications
- Volvo Penta D3-110I-D / E / F / G / H
- Volvo Penta D3-140A-D / E / F / G / H
- Volvo Penta D3-140I-E / F / G / H
- Volvo Penta D3-150I-D / E / F / G / H
- Volvo Penta D3-170A-D / E / F / G / H
- Volvo Penta D3-170I-D / E / F / G / H
- Volvo Penta D3-200A-D / E / F / G / H
- Volvo Penta D3-200I-D / E / F / G / H
- Volvo Penta D3-220A-D / E / F / G / H
- Volvo Penta D3-220I-D / E / F / G / H
Confirm your complete engine model, generation suffix, and serial number against the Volvo Penta D3 crank mechanism diagram before ordering. Crankshaft and front-engine components can vary by generation and serial range.
Serial Number Requirements
Volvo Penta revised crankshaft, pulley, and related front-engine components across D3 generations. Always confirm your engine model, generation suffix, and serial number against the applicable Volvo Penta D3 crank mechanism parts diagram before ordering.
System
Engine Internal — Crank Mechanism / Front Crankshaft & Pulley Assembly
Related Parts — D3 Crank Mechanism
The following components are part of the D3 front crankshaft assembly and should be inspected during damper service:
- Crankshaft — 31293424
- Crankshaft Pulley — 30777171
- Crankshaft Nut — 3531111
- Flange Screws — 984755
- Oil Pump — 30777092
- Sealing Ring — 9458178
Dimensions & Weight
- Weight: Approximately 2.2 kg
- Dimensions per Volvo Penta D3 crank mechanism specification
When This Part Needs Replacement
Inspect and replace the oscillation damper if any of the following are present:
- Deteriorated, cracked, or separated damping material
- Distortion or physical damage to the damper body
- Excessive vibration from the crankshaft or front pulley area
- Wobble or misalignment at the front crankshaft assembly
- Damage discovered during crankshaft or pulley service
It is also good practice to inspect the damper whenever adjacent crankshaft or pulley components are already removed, as damper wear can be difficult to detect without access to the front assembly.
Installation Notes
Inspect the crankshaft nose, pulley, and mounting hardware before installation. Tighten all components to the torque values specified in the applicable Volvo Penta D3 service documentation. Compare the removed damper carefully against the replacement before installation to confirm correct fitment.
Technical FAQ
Q: What does the oscillation damper do?
A: It absorbs and controls torsional vibration at the front of the crankshaft, reducing stress on the rotating assembly and protecting the crankshaft, pulley, and front-end components from vibration-related wear over time.
Q: Is this the same as a belt tensioner or engine mount?
A: No. This is a crankshaft torsional vibration damper mounted at the front pulley assembly. It is not a belt tensioner, idler pulley, or engine-mount vibration isolator.
Q: How do I confirm this fits my D3 engine?
A: Match your engine model, generation suffix (D through H), and serial number to the Volvo Penta D3 crank mechanism diagram. Confirm the damper position at the front crankshaft and pulley assembly.
Q: When should I inspect the damper?
A: Any time the front crankshaft or pulley assembly is apart for service, or if the engine shows unusual vibration from the front end. Damper wear can be gradual and is easiest to catch during planned service when the area is already accessible.
Parts Desk Insights
This part is sometimes confused with belt tensioners or engine mounts because customers search for “vibration damper” — it’s worth clarifying upfront that 31258122 is specifically the crankshaft torsional damper at the front pulley assembly. The other common issue is customers matching only by engine family and skipping the serial-number check. On D3 engines, front-end crankshaft components can vary by generation, so the serial number is the most reliable way to confirm correct fitment. If the crankshaft pulley or front seals are also being replaced, it’s a good opportunity to inspect the damper at the same time — the labor is already done.
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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