Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 (Replaces 57-865615Q10)
Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 (Replaces 57-865615Q10) 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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Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L...
Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 (Replaces 57-865615Q10) is backordered and will ship as soon as it is back in stock.
Product Details
This is a high-quality aftermarket Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 Engines (Replaces 57-865615Q10). It is designed for reliable performance in Mercury MerCruiser 5.0L, 5.7L, and 6.2L V8 engines, including standard and MPI Horizon models manufactured between 2001 and 2008.
This belt is a direct replacement for Mercury part numbers 57-865615Q10, 57-865615010, 865615010, and 865615Q10.
- Drives the engine alternator and water pump.
- Constructed from durable, reinforced rubber to resist wear and heat.
- Engineered to meet or exceed OEM specifications for fit and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 57-865615Q10 |
| Mercury | 57-865615010 |
| Mercury | 865615010 |
| Mercury | 865615Q10 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser Engines: This belt fits specific V8 models listed below. Always verify your engine's model and serial number range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 5.7L MPI Horizon MIE | 350 | 4-Stroke | 2008 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | 5.7L MPI MIE (FWC) | 350 | 4-Stroke | 2008 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | MX 6.2L MPI MIE | 377 | 4-Stroke | 2002–2007 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | MX 6.2L MPI Horizon MIE | 377 | 4-Stroke | 2002–2008 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | 350 Mag MPI Horizon MIE | 350 | 4-Stroke | 2002–2007 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | 350 Mag MPI MIE | 350 | 4-Stroke | 2002–2007 | 57-865615Q10 | 2195 mm belt |
| MerCruiser | 377 MPI MIE | 377 | 4-Stroke | 2008 | 57-865615Q10 | 2195 mm belt |
Technical Specs
- Product Type
- Serpentine Belt
- Installation
- Engine Accessory Drive
- Housing Material
- Reinforced Rubber
- Housing Color
- Black
- Dimensions
- 2195 mm (length)
- Other Technical Attributes
- Drives alternator and water pump
What’s in the Box
- 1 x Serpentine Belt (57-865615Q10)
Installation Notes
- Disconnect the negative battery terminal to prevent accidental starts.
- Locate the serpentine belt and the automatic tensioner pulley.
- Use a suitable wrench or belt tensioner tool to rotate the tensioner, releasing pressure on the belt.
- Carefully slip the old belt off the pulleys. Note the routing path before removal.
- Compare the old belt with the new one to ensure they are the same length.
- Route the new belt around the pulleys according to your engine's diagram. It is often easiest to leave a smooth, non-grooved pulley for last.
- Release the tensioner to apply pressure to the new belt.
- Double-check that the belt is correctly seated in all pulley grooves.
- Reconnect the battery terminal and start the engine to check for proper operation.
Troubleshooting & FAQ
How can I confirm this belt fits my engine?
The surest way is to match your original part number to one of the cross-references listed in our Part Number Matrix. You can also review the Engine & Model Compatibility table, but always verify against your specific engine model and year.
What are the signs of a failing serpentine belt?
Common signs include squealing or chirping noises from the engine bay, visible cracks or fraying on the belt, and accessories like the alternator or water pump failing to operate correctly, which may cause overheating or battery issues.
How often should this serpentine belt be replaced?
While there is no fixed interval, it is best to inspect the belt during regular engine maintenance. Replacement is typically recommended every 500-1000 hours of operation, or if signs of wear like glazing, cracking, or fraying are visible.
Can I install this belt myself?
If you have experience with marine engine maintenance and the correct tools (like a tensioner wrench), installation is straightforward. However, due to the importance of correct routing and tension, we recommend professional installation for safety and optimal performance.
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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