Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L & 7.4L Engines (Replaces 57-865615Q06, 865615006)
Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L & 7.4L Engines (Replaces 57-865615Q06, 865615006) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L & 7.4L En...
Product Details
This is a direct-replacement Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L & 7.4L Engines, specifically designed for MerCruiser V8 models including 5.0L, 5.7L, and 6.2L Bravo/Alpha engines (2002–2004) as well as 7.4L/454 Mag MPI engines (1998–2001). It ensures reliable power transmission for engine accessories.
It serves as a direct interchange for Mercury part numbers 57-865615Q06, 865615006, 57-8638766, and 57-8610491.
- Installation: Mounts to the engine accessory drive to power components like the alternator, power steering pump, and water pump.
- Application: Designed for V-belt systems in marine environments.
- Warranty: Includes a 1-year warranty from JLM Marine against manufacturing defects.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 57-865615Q06 |
| Mercury | 865615006 |
| Mercury | 57-8638766 |
| Mercury | 57-8610491 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser owners, verify your engine's serial number is within the specified range for a guaranteed match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 5.0L Bravo/Alpha | 250-300 HP | 4-Stroke | 2002–2004 | 57-865615Q06 | Serial 0M600000+ |
| MerCruiser | 350 Mag Bravo/Alpha | 300-350 HP | 4-Stroke | 2002–2004 | 57-865615Q06 | Serial 0M600000+ |
| MerCruiser | 6.2L Bravo/Alpha | 350-375 HP | 4-Stroke | 2002–2004 | 57-865615Q06 | Serial 0M600000+ |
| MerCruiser | 454 Mag MPI | 385-425 HP | 4-Stroke | 1998–2001 | 57-865615Q06 | Serial 0L010029-0M024999 |
| MerCruiser | 502 Mag MPI | 385-425 HP | 4-Stroke | 1998–2001 | 57-865615Q06 | Serial 0L010029-0M024999 |
| MerCruiser | 7.4L | 385-425 HP | 4-Stroke | 1998–2001 | 57-865615Q06 | Serial 0L010029-0M024999 |
Technical Specs
- Product Type
- Serpentine Belt
- Installation
- Engine Accessory Drive
- Length
- 2667 mm (105")
- Width
- 20.6 mm (13/16")
- Material
- Rubber with fiber reinforcement
- Housing Color
- Black
- Dimensions
- 2667 mm × 20.6 mm (L × W)
- Application
- V-belt system for accessory drive
- Warranty
- 1 year (JLM Marine)
- Other Technical Attributes
- Standard rotation
What’s in the Box
- 1 x Serpentine Belt (57-865615Q06/865615006)
Installation Notes
- Disconnect the boat's battery for safety.
- Locate the serpentine belt and the automatic tensioner pulley.
- Use a wrench or breaker bar to rotate the tensioner, releasing pressure on the belt.
- Carefully slide the old belt off the pulleys.
- Inspect all pulleys for wear, damage, or misalignment before proceeding.
- Route the new belt according to the engine's diagram, ensuring it is seated correctly in all pulley grooves.
- Release the tensioner to apply pressure to the new belt.
- Double-check belt alignment and tension.
- Reconnect the battery and start the engine to verify proper operation.
Troubleshooting & FAQ
How do I confirm this belt is the correct one for my engine?
The best way is to match your existing part number to one of the cross-references listed in our Part Number Matrix. If you cannot find a part number, check your engine model, year, and serial number against our compatibility table. When in doubt, compare the length and width of your old belt to our technical specs.
What are common signs of a worn or failing serpentine belt?
Look for visible cracking, fraying, or glazing on the belt's surface. Squealing noises during engine operation, especially on startup or when turning, are also a key indicator. Overheating or a loss of power steering can signal a complete belt failure.
What is the recommended replacement interval for a marine serpentine belt?
While there is no fixed interval, it is good practice to inspect the belt annually for signs of wear. Under typical marine use, replacement is often recommended every 3-5 years or 300-500 operating hours, whichever comes first, to prevent unexpected failure.
Is this belt the same quality as an OEM Mercury part?
Yes, this aftermarket belt is manufactured to meet or exceed OEM specifications. It is made from high-strength, fiber-reinforced rubber designed to withstand the harsh marine environment, ensuring comparable performance and durability to the original part.
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.
Payment & Security
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