V-Belt for Volvo Penta 8.1 Gi/Gsi Stern Drive and OMC Cobra Applications (Replaces 21132390, 3817290, 3861034, 3889126)
V-Belt for Volvo Penta 8.1 Gi/Gsi Stern Drive and OMC Cobra Applications (Replaces 21132390, 3817290, 3861034, 3889126) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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V-Belt for Volvo Penta 8.1 Gi/Gsi Stern Drive and OMC Cobra Applica...
V-Belt for Volvo Penta 8.1 Gi/Gsi Stern Drive and OMC Cobra Applications (Replaces 21132390, 3817290, 3861034, 3889126) is backordered and will ship as soon as it is back in stock.
Product Details
This marine V-belt is listed for Volvo Penta 8.1 Gi and 8.1 Gsi stern-drive applications. It is also associated with Volvo Penta stern/out-drive and OMC Cobra stern/out-drive applications. Use the exact engine and drive identification to confirm fitment before ordering.
The supplier lists Volvo Penta reference numbers 21132390, 3817290, 3861034, and 3889126 for this belt. These numbers are provided as reference identifiers; confirm the number and belt routing against your original part and engine configuration.
- Single replacement marine belt; this is not a kit.
- Listed for Volvo Penta 8.1 Gi and 8.1 Gsi applications.
- Suitable for specified stern-drive and out-drive belt applications when the reference number and routing match.
Part Number Matrix
The following reference numbers are listed for this replacement belt. They should be used together with the exact engine and drive configuration for fitment verification.
| Brand or Application | Reference Number |
|---|---|
| Volvo Penta | 21132390 |
| Volvo Penta | 3817290 |
| Volvo Penta | 3861034 |
| Volvo Penta | 3889126 |
Engine & Model Compatibility
The company fitment record identifies the following Volvo Penta engine applications. The available record does not provide specific production years, serial-number ranges, horsepower ratings, or individual model suffixes, so verify those details before purchase.
| Brand | Engine Model | Engine Description | Application | Reference Numbers |
|---|---|---|---|---|
| Volvo Penta | 8.1 Gi | 8.1L gasoline inboard/stern-drive application | Stern drive / out drive | 21132390, 3817290, 3861034, 3889126 |
| Volvo Penta | 8.1 Gsi | 8.1L gasoline inboard/stern-drive application | Stern drive / out drive | 21132390, 3817290, 3861034, 3889126 |
| OMC Cobra | Specific model not stated | Application association listed by the supplier | Stern drive / out drive | Verify the original belt and routing |
Technical Specs
- Product Type
- Marine V-belt
- Product Configuration
- Single replacement belt
- Listed Engine Applications
- Volvo Penta 8.1 Gi and 8.1 Gsi
- Listed Drive Applications
- Volvo Penta stern/out-drive and OMC Cobra stern/out-drive applications
- Primary Listed Reference
- 21132390
- Additional Listed References
- 3817290, 3861034, 3889126
What’s in the Box
- 1 x Marine V-belt
Installation Notes
- Switch off the engine and disconnect the vessel's battery before beginning work.
- Locate the belt-routing information for your specific engine and drive. If no diagram is available, document the existing routing before removing the old belt.
- Release the belt tension using the appropriate tensioner or adjustment mechanism for your engine. Do not force the belt over a pulley.
- Remove the old belt and inspect the pulleys, tensioner, and related components for damage, misalignment, corrosion, or seizure.
- Install the replacement belt following the original routing and ensure it is fully seated in every pulley groove.
- Apply the tension specified for your engine. The tensioning method may vary by engine and drive configuration.
- Rotate the system by hand where possible and recheck belt alignment before reconnecting the battery.
- After installation, run the engine only when it is safe to do so and check for abnormal noise, slipping, or belt misalignment.
Troubleshooting & FAQ
How do I confirm this belt fits my engine?
Confirm that your engine is a Volvo Penta 8.1 Gi or 8.1 Gsi, or that your application is the specified Volvo Penta or OMC Cobra stern-drive/out-drive configuration. Also compare the original belt, routing, and one or more listed reference numbers: 21132390, 3817290, 3861034, or 3889126. Model suffixes, serial ranges, and routing can vary, so check the complete engine identification before ordering.
Is this a serpentine belt or a V-belt?
This listing is for a marine V-belt. The original page incorrectly described it as a serpentine belt and included unsupported 4.3L, 5.0L, and 5.7L fitment. Confirm the belt profile and routing on your engine before installation.
What are common signs that a belt needs replacement?
Inspect for cracking, fraying, glazing, hardening, excessive wear, damaged edges, or visible loss of profile. Squealing, slipping, or abnormal belt vibration can also indicate belt or pulley problems. Find and correct the underlying cause before installing a replacement.
Do I need a special tool for installation?
The required tools depend on the engine and drive configuration. Some applications use an adjustable belt system, while others may use a tensioner. Use the service procedure for your exact engine and avoid prying the belt onto a pulley.
Is this an OEM belt?
This listing is for a replacement marine belt and is not identified as a Volvo Penta or OMC-branded OEM component. The listed reference numbers are provided for application identification.
What is included?
The package contains one replacement marine V-belt. No additional hardware or installation tools are specified.
Safety & Important Information
- Verify the exact engine model, drive configuration, original belt profile, routing, and reference number before purchase.
- Do not rely on horsepower, engine displacement, or a general model family alone to confirm fitment.
- Disconnect the battery and keep hands, clothing, and tools away from moving components during inspection and testing.
- Professional installation is recommended when the belt system, tensioning method, or routing is unclear.
About Sea Sierra
- Marine Parts Focus — Replacement components for marine engine and drive applications.
- Application-Focused Listings — Verify model and reference-number details before ordering.
- Support When Needed — Contact support with your engine identification and original part information if you need help confirming an application.
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