V-Belt Alternator Belt for MerCruiser 3.0L Alpha One & MPI EC Engines – Replaces 57-862054Q
V-Belt Alternator Belt for MerCruiser 3.0L Alpha One & MPI EC Engines – Replaces 57-862054Q is backordered and will ship as soon as it is back in stock.
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V-Belt Alternator Belt for MerCruiser 3.0L Alpha One & MPI EC E...
V-Belt Alternator Belt for MerCruiser 3.0L Alpha One & MPI EC Engines – Replaces 57-862054Q is backordered and will ship as soon as it is back in stock.
Product Details
This V-belt is a replacement alternator belt for selected MerCruiser 3.0L marine engines. It is specified for MerCruiser 3.0L Alpha One engines and 3.0L MPI EC engines within the serial-number ranges listed below. The belt measures 39-1/2 inches in length.
Documented reference numbers for this belt include Mercury/MerCruiser 57-862054Q, 862054, and 8M2017519. Use the engine model and serial-number information—not only the engine displacement—to confirm fitment before ordering.
- V-belt for the engine alternator drive.
- Designed for specified MerCruiser 3.0L Alpha One and 3.0L MPI EC applications.
- 39-1/2-inch belt length.
- Supplied as one individual belt.
Part Number Matrix
These are the documented manufacturer reference numbers associated with this belt.
| Brand | Reference Part Number |
|---|---|
| Mercury / MerCruiser | 57-862054Q |
| Mercury / MerCruiser | 862054 |
| Mercury / MerCruiser | 8M2017519 |
Engine & Model Compatibility
Check both the engine model and the complete serial number against the application details below. The listed serial ranges are part of the fitment specification.
| Brand | Engine Model | Serial Number Condition | Application | Reference Part Number |
|---|---|---|---|---|
| MerCruiser | 3.0L Alpha One | 1A002000–1A020543 | Alternator V-belt | 57-862054Q |
| MerCruiser | 3.0L Alpha One | 1A020544 and up | Alternator V-belt | 57-862054Q |
| MerCruiser | 3.0L MPI EC | 1A072812 and up | Alternator V-belt | 57-862054Q |
Technical Specs
- Product Type
- V-belt
- Application
- Alternator belt
- Compatible Engine Family
- Selected MerCruiser 3.0L engines
- Compatible Models
- 3.0L Alpha One and 3.0L MPI EC
- Length
- 39-1/2 inches
- Length in Millimeters
- Approximately 1003.3 mm
- Quantity
- One belt
What’s in the Box
- 1 x V-belt
Installation Notes
- Turn off the engine and disconnect the battery before beginning work.
- Confirm the replacement belt length and reference number against the belt being removed.
- Note or photograph the existing belt routing before removal.
- Loosen the alternator mounting hardware or belt-adjustment mechanism to release tension.
- Remove the old belt and inspect the pulleys for wear, damage, contamination, or misalignment.
- Install the new belt in the correct pulley grooves, following the original routing.
- Adjust the belt tension according to the engine manufacturer's service procedure. Do not rely on a generic deflection value if the service manual specifies a different setting.
- Check that the belt is centered and properly seated on every pulley before tightening the mounting hardware.
- Reconnect the battery and run the engine briefly while observing the belt for smooth tracking, abnormal noise, or slippage.
Troubleshooting & FAQ
How do I confirm that this belt fits my MerCruiser 3.0L engine?
Match your engine model and complete serial number to the compatibility table. This belt is documented for 3.0L Alpha One engines with serial numbers 1A002000–1A020543 and 1A020544 and up, and for 3.0L MPI EC engines with serial number 1A072812 and up.
What component does this belt drive?
The company application identifies this as a MerCruiser 3.0L alternator belt. Confirm the belt routing on your specific engine before installation.
What are common signs that an alternator belt needs replacement?
Cracks, fraying, glazing, looseness, visible wear, belt dust, or squealing during operation can indicate belt or pulley problems. Inspect the pulleys and alignment as well as the belt.
Can I install this belt without checking the serial number?
No. The 3.0L displacement alone does not establish fitment. The engine model and serial-number range must also match the documented application.
Should the belt tension be checked after installation?
Yes. Verify routing and tension after installation and recheck them after the initial run. Follow the service procedure for your specific engine.
Is this an OEM belt?
This listing is for a replacement V-belt. Mercury/MerCruiser reference numbers are provided for identification and fitment comparison; the product should not be assumed to be a genuine OEM-branded belt unless explicitly stated by the seller.
Safety & Important Information
- Verify the engine model, serial number, belt routing, and required belt length before installation.
- Disconnect the battery and keep hands, clothing, and tools away from moving components during testing.
- Do not install a belt that is damaged, contaminated, incorrectly sized, or not seated correctly.
- Professional installation is recommended if you are not familiar with marine engine belt service.
About Sea Sierra
- Marine Parts Focus — We provide replacement components for marine engine maintenance and repair.
- Fitment-Focused Listings — Model and serial-number information is provided to help support accurate part selection.
- Practical Replacement Solutions — Choose the correct component by comparing the application details and reference numbers with your engine.
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