Serpentine Belt Tensioner – Fits Volvo Penta 3.0L-8.2L (Replaces Volvo Penta 3860079, 872984)
Serpentine Belt Tensioner – Fits Volvo Penta 3.0L-8.2L (Replaces Volvo Penta 3860079, 872984) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Serpentine Belt Tensioner – Fits Volvo Penta 3.0L-8.2L (Replaces Vo...
Product Details
This aftermarket Serpentine Belt Tensioner is designed for a broad range of Volvo Penta marine engines from 1989 to the present, including 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L GL, GLM, GSi, GXi, and OSi series. It ensures the serpentine belt maintains the correct tension for optimal accessory drive performance.
This component is a direct interchange for Volvo Penta part numbers 3860079 and 872984, offering a reliable fit and function.
- Engineered as a direct OEM-style replacement for hassle-free installation.
- Features a bolt-on mounting assembly for secure attachment.
- Constructed from high-strength metal and wear-resistant composite materials for durability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3860079 |
| Volvo Penta | 872984 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for Volvo Penta gasoline sterndrive models listed. Verify your specific model and OEM part number before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0GLM-A | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLM-B | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLM-C | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLP-A | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLP-B | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLP-C | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLP-D | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GLP-E | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GSM-A/B/C | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GSMEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GSP-A/B/C | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 3.0GSPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 4.3GXi-A through 4.3GXi-EF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 4.3GiPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 4.3OSi-B/BF/C/CF/D/DF/E/EF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 4.3GIJWTR, 4.3GSJWTR | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 4.3GLPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.0GXi-A through 5.0GXi-JF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.0GXiE-J/JF, 5.0GXiCE-J | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.0GLPEFS, 5.0GiPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.0OSi-A through 5.0OSi-JF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.0OSiE-J/JF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7G | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GL-A through 5.7GL-E | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GSIPEFS, 5.7GSPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GSiI-A | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GXi-A through 5.7GXi-FF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GXiI-A through 5.7GXiI-H | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7Gi-A through 5.7Gi-EF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GiI-A through 5.7GiI-G | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7GiPHUS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7OSXi-AF/B/BF/D/DF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 5.7OSi-AF/B/BF/D/DF | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | 7.4GIPWTR, 7.4GSIPWTR | 160-430 | 4-Stroke | 1989–present | 3860079 | |
| Volvo Penta | 7.4GSiPEFS, 7.4GiPEFS | 160-430 | 4-Stroke | 1989–present | 3860079 | |
| Volvo Penta | 8.2GSIPWTR, 8.2GSiPEFS | 4-Stroke | 1989–present | 3860079 | ||
| Volvo Penta | DPX385XEFS, DPX415XEFS | 4-Stroke | 1989–present | 3860079 |
Technical Specs
- Product Type
- Serpentine Belt Tensioner / Belt Idler Pulley
- Installation
- Direct OEM replacement
- Fuel Type
- Compatible with both gasoline and diesel engines
- Connection
- Bolt-on mounting assembly
- Housing Material
- High-strength metal and wear-resistant composite material
- Housing Color
- Black/Metal
- Fitting Type
- Bolt-mounted tensioner assembly
- Warranty
- 1-year manufacturer warranty against defects
What’s in the Box
- 1 x Serpentine Belt Tensioner (3860079)
Installation Notes
- Disconnect the boat's battery before beginning work.
- Locate the existing serpentine belt tensioner. It is typically mounted on the engine block.
- Use a breaker bar or appropriate tensioner tool to release the tension from the serpentine belt and carefully slip the belt off the pulley.
- Unbolt and remove the old tensioner assembly from its mounting point.
- Clean the mounting surface on the engine block to ensure the new tensioner sits flush.
- Install the new tensioner assembly, torquing the bolts to the manufacturer's recommended specification.
- Route the serpentine belt according to the engine's diagram, ensuring it is seated correctly on all pulleys.
- Apply pressure to the new tensioner to allow the belt to be fully installed, then slowly release it to apply tension.
- Double-check that the belt is properly aligned and under correct tension. Reconnect the battery.
Troubleshooting & FAQ
How do I know if this tensioner fits my specific engine model?
This part fits a wide range of Volvo Penta engines from 1989 to present. The best way to ensure a match is to consult the compatibility table above and verify that your engine model and year are listed. Always cross-reference the OEM part number (3860079) with your existing part or service manual.
What are common signs of a failing belt tensioner?
Symptoms of a bad or failing tensioner include a persistent squealing or rattling noise from the engine bay, premature or uneven wear on the serpentine belt, and accessories (like the alternator or water pump) not functioning correctly due to a loose belt.
What is the recommended replacement interval for a tensioner?
There is no fixed replacement interval, but it is best practice to inspect the tensioner for wear, proper tension, and smooth pulley operation whenever the serpentine belt is replaced. Many mechanics recommend replacing the tensioner and belt at the same time to ensure system reliability.
Is any special tool required for installation?
For most installations, a standard socket set and a long-handled breaker bar or a specific serpentine belt tensioner tool are sufficient to release the belt tension and remove the mounting bolts. No other specialized equipment is typically needed.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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