Alternator V-Belt for MerCruiser 3.0L and 3.0L MPI — Replaces Mercury 57-862054Q and 57-862054
Alternator V-Belt for MerCruiser 3.0L and 3.0L MPI — Replaces Mercury 57-862054Q and 57-862054 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Alternator V-Belt for MerCruiser 3.0L and 3.0L MPI — Replaces Mercury 57-862054Q and 57-862054 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement alternator V-belt is designed for the accessory belt system used on MerCruiser 3.0L and 3.0L MPI gasoline engines. It provides the belt drive needed for the alternator and is intended as a replacement for the original belt when it is worn, cracked, glazed, stretched, or slipping.
The belt is listed as a replacement for Mercury and MerCruiser part numbers 57-862054Q and 57-862054. Sierra reference 18-15114 is also included for comparison. Confirm the part number, belt routing, engine serial range, and pulley arrangement before ordering.
- Replacement alternator V-belt for compatible MerCruiser applications.
- Designed for use in marine gasoline engine environments.
- Supplied as one individual V-belt.
- Proper belt tension and alignment are required for reliable operation.
Part Number Matrix
Use the following references to compare the belt with the part removed from your engine. Part-number comparison should be combined with visual and application verification.
| Brand | Part Number | Reference Type |
|---|---|---|
| Mercury | 57-862054Q | Replacement reference |
| Mercury | 57-862054 | Replacement reference |
| MerCruiser | 57-862054Q | Replacement reference |
| MerCruiser | 57-862054 | Replacement reference |
| Quicksilver | 57-862054Q | Reference number |
| Sierra | 18-15114 | Aftermarket reference |
Engine & Model Compatibility
The available product listing identifies this belt for MerCruiser 3.0L and 3.0L MPI applications, including models beginning in 1999 and later. Confirm the complete engine identification and serial number against your service information before installation.
| Brand | Model | Rated HP | Engine Type | Year Coverage | Reference Part No. | Fitment Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 3.0L | 135 HP listing application | Gasoline | 1999 and later listing coverage | 57-862054Q | Verify engine serial number, belt routing, and pulley configuration. |
| MerCruiser | 3.0L MPI | 135 HP listing application | Gasoline | 1999 and later listing coverage | 57-862054Q | Verify engine serial number, belt routing, and pulley configuration. |
Technical Specs
- Product Type
- Alternator V-belt
- Application
- Engine accessory belt system
- Fuel Type
- Gasoline
- Approximate Belt Length
- 1003 mm (39.49 in)
- Installation Requirement
- Set belt tension according to the engine manufacturer's service specifications.
- Primary Function
- Drives the alternator on compatible MerCruiser engine applications.
What’s in the Box
- 1 x alternator V-belt
Installation Notes
- Allow the engine to cool completely and disconnect the battery's negative terminal.
- Locate the alternator and inspect the existing belt routing before removal.
- Loosen the alternator or belt-adjustment hardware to release tension.
- Remove the old belt from all pulleys and compare its width, length, and profile with the replacement.
- Route the new belt according to the engine's belt-routing diagram, making sure it is fully seated in every pulley groove.
- Adjust belt tension according to the engine service manual. Do not over-tighten the belt.
- Tighten the alternator and adjustment hardware securely.
- Reconnect the battery, start the engine, and check for abnormal noise, belt wandering, or slippage.
Troubleshooting & FAQ
How do I confirm this belt fits my specific engine?
Confirm that your engine is a MerCruiser 3.0L or 3.0L MPI application covered by the listing, then compare the original belt and part number with the references shown above. Check the complete engine serial number, pulley arrangement, and belt-routing diagram before purchase or installation.
What are the signs of a failing alternator belt?
Common signs include squealing, visible cracking or fraying, glazing, belt dust, battery-charging problems, or a belt that slips or wanders on the pulleys. Inspect the pulleys and tension adjustment as well as the belt.
How often should I replace the alternator belt?
Follow the maintenance schedule in your engine service manual. Inspect the belt regularly for cracks, glazing, fraying, stretching, contamination, and improper tension, and replace it if any damage or abnormal wear is found.
Is this an OEM belt?
This listing is for an aftermarket replacement belt, not a Mercury or MerCruiser-branded OEM component. Use the listed part numbers and application information to compare it with the belt required for your engine.
What should I do if the belt does not match my engine?
Do not force the belt onto the pulleys or operate the engine with an incorrect belt. Compare the original part, routing, dimensions, and engine serial information, then contact support if you need help confirming the application.
Safety & Important Info
- Disconnect the battery and allow the engine to cool before beginning work.
- Verify the part number, belt profile, length, pulley arrangement, and engine serial information before installation.
- Do not operate the engine if the belt is loose, misaligned, damaged, or contacting another component.
- Professional installation is recommended if you are unfamiliar with marine engine belt replacement.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for common marine service and repair applications.
- Application-Focused Listings — Product descriptions include available part-number and fitment references to support careful selection.
- Support for Installation Questions — Contact support with your engine model, serial information, and original part number when application assistance is needed.
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