Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L, 7.4L (Replaces 865615Q06, 57-865615Q06, 18-15102)
Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L, 7.4L (Replaces 865615Q06, 57-865615Q06, 18-15102) 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 (Replac...
Product Details
This aftermarket Serpentine Belt – Fits MerCruiser V8 5.0L, 5.7L, 6.2L, 7.4L Engines is designed for a range of V8 sterndrive and inboard models, primarily from 1998–2004. It is engineered for specific configurations, including engines equipped with a high mount alternator, power steering, and a closed cooling system.
It serves as a direct replacement for MerCruiser part numbers 865615Q06, 57-865615Q06, 865615006, 57-865615006, 8638766, 57-8638766, 8610491, and 57-8610491, as well as Sierra 18-15102.
- Installation involves external engine components.
- Constructed from an OEM-grade rubber compound for durability.
- Designed for the primary engine belt drive system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 865615Q06 / 57-865615Q06 |
| MerCruiser | 865615006 / 57-865615006 |
| MerCruiser | 8638766 / 57-8638766 |
| MerCruiser | 8610491 / 57-8610491 |
| Sierra | 18-15102 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser Engines: Please verify your model, year, and serial number range. Fitment is specific to models with Power Steering, Closed Cooling, and a High Mount Alternator, unless otherwise noted.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 5.0L Bravo | 5.0L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 5.0L Alpha | 5.0L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 350 Mag Alpha | 5.7L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 350 Mag Bravo | 5.7L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 5.7L Alpha | 5.7L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 5.7L Bravo | 5.7L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | MX 6.2L MPI | 6.2L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | MX 6.2L MPI Horizon | 6.2L | 4-Stroke | 2002–2004 | 865615Q06 | With Power Steering, Closed Cooling, High Mount Alternator (0M600000+) |
| MerCruiser | 454 Mag MPI | 7.4L | 4-Stroke | 1998–2001 | 865615Q06 | With 5 3/4 Inch Pulley (0L010029-0M024999) |
| MerCruiser | 7.4L MPI | 7.4L | 4-Stroke | 1998–2001 | 865615Q06 | With 5 3/4 Inch Pulley (0L010003-0M024330) |
| MerCruiser | 502 Mag MPI | 8.2L | 4-Stroke | 1998–2001 | 865615Q06 | With 5 3/4 Inch Pulley (0L017000-0M024999) |
Technical Specs
- Product Type
- Serpentine Belt
- Installation
- External Engine Component
- Belt Length
- 2,667 mm (105 inches)
- Belt Type
- Serpentine (Multi-rib)
- Material
- OEM-grade Rubber Compound
- Application
- Primary Engine Belt Drive System
- Compatibility
- High Mount Alternator, Power Steering, Closed Cooling
- Dimensions
- 2,667 mm Length
- Other Technical Attributes
- Matches original OEM specifications for proper fitment and function
What’s in the Box
- 1 x Serpentine Belt (865615Q06)
Installation Notes
- Disconnect the boat's battery for safety.
- Locate the serpentine belt and the automatic tensioner pulley. It is helpful to sketch or photograph the belt's routing path around the pulleys before removal.
- Use a serpentine belt tool or a long-handled breaker bar/ratchet to rotate the tensioner pulley and release tension from the belt.
- Carefully slide the old belt off the pulleys.
- Visually compare the new belt with the old one to ensure the length and rib count match.
- Route the new belt according to your diagram, starting with the crankshaft pulley and leaving the tensioner or an idler pulley for last.
- Release the tensioner to apply pressure to the new belt. Ensure the belt is properly seated in all pulley grooves.
- Reconnect the battery, start the engine, and briefly run it to confirm the belt is tracking correctly.
Troubleshooting & FAQ
How do I confirm this belt fits my specific engine?
The most reliable method is to check your engine's serial number against the ranges listed in the compatibility table notes. The model, year, and accessory configuration (e.g., power steering, high-mount alternator) are all critical for confirming fitment.
What are the signs that my old serpentine belt is failing?
Common indicators include loud squealing or chirping noises from the engine bay, visible cracks or fraying on the belt's surface, glazing or shininess on the ribs, or issues with systems driven by the belt, such as the alternator (low battery voltage) or power steering (stiff steering).
What is the recommended replacement interval for this belt?
As a general best practice, serpentine belts should be inspected for wear at every service interval and typically replaced every 3-5 years, depending on usage hours and conditions. Always refer to your engine manufacturer’s service manual for specific recommendations.
What does "High Mount Alternator" mean for fitment?
This refers to the physical location of the alternator on the engine. Different mounting positions (high vs. low) create different belt routing paths and require belts of different lengths. This belt is specifically for the high-mount configuration noted in the compatibility table.
What is the difference between an OEM and an aftermarket part?
This listing is for an aftermarket replacement, not a component sourced from the original equipment manufacturer (OEM). It is engineered to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How fast do you ship and what is the cost?
We ship worldwide quickly, with typical transit times between 5–15 days for most destinations. Standard shipping is free. If expedited options are available for your location, they will be presented at checkout.
What is your warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window, provided the part is unused and in its original condition. See our full 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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