Serpentine Belt for MerCruiser V8 5.0L, 5.7L, 6.2L and 7.4L Engines – Replaces 865615Q06 and 57-865615Q06
Serpentine Belt for MerCruiser V8 5.0L, 5.7L, 6.2L and 7.4L Engines – Replaces 865615Q06 and 57-865615Q06 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 Belt for MerCruiser V8 5.0L, 5.7L, 6.2L and 7.4L Engines...
Serpentine Belt for MerCruiser V8 5.0L, 5.7L, 6.2L and 7.4L Engines – Replaces 865615Q06 and 57-865615Q06 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket serpentine belt is intended for selected MerCruiser V8 engines in 5.0L, 5.7L, 6.2L and 7.4L configurations. It is a replacement belt for the engine accessory drive and may be used on applications equipped with power steering, a high-mount alternator and closed cooling when those features and the engine serial-number range match the original application.
Always compare the original belt, pulley arrangement, accessory configuration and engine serial number before ordering. Similar MerCruiser engines can use different belt lengths or routing arrangements.
- Aftermarket replacement for the primary engine accessory belt drive.
- Designed for external engine installation.
- Single serpentine belt; installation hardware is not included.
Part Number References
These references identify the application associated with this replacement belt. Verify the complete engine application before purchase.
| Brand | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 865615Q06 | Replacement reference |
| MerCruiser | 57-865615Q06 | Replacement reference |
| Sierra | 18-15102 | Aftermarket reference |
Engine Compatibility
This belt is listed for selected MerCruiser V8 applications with 5.0L, 5.7L, 6.2L and 7.4L engines. Fitment depends on the exact model, production year, serial-number range and accessory layout.
| Brand | Engine Family | Displacement | Important Fitment Conditions |
|---|---|---|---|
| MerCruiser | V8 | 5.0L | Confirm belt routing, accessory configuration and serial-number range. |
| MerCruiser | V8 | 5.7L | Confirm belt routing, accessory configuration and serial-number range. |
| MerCruiser | V8 | 6.2L | Confirm belt routing, accessory configuration and serial-number range. |
| MerCruiser | V8 | 7.4L | Confirm belt routing, accessory configuration and serial-number range. |
Important: The displacement alone does not confirm fitment. High-mount and low-mount alternator layouts, power-steering equipment, closed-cooling equipment and pulley arrangements can change the required belt.
Technical Specifications
- Product Type
- Serpentine belt
- Application
- MerCruiser V8 engine accessory drive
- Listed Engine Displacements
- 5.0L, 5.7L, 6.2L and 7.4L
- Installation Location
- External engine component
- Construction
- Aftermarket rubber serpentine belt
- Reference Numbers
- 865615Q06, 57-865615Q06 and 18-15102
- Fitment Requirements
- Exact model, serial number, belt routing and accessory configuration must be verified before installation
What’s in the Box
- 1 x Serpentine belt
Installation Notes
- Disconnect the boat’s battery and allow the engine to cool before beginning work.
- Record or photograph the existing belt routing before removal.
- Relieve tension at the tensioner, where equipped, using the appropriate tool.
- Remove the old belt and compare the replacement belt’s length, rib profile and overall routing requirements.
- Route the new belt around the pulleys according to the engine manufacturer’s diagram.
- Make sure every rib is seated correctly in the pulley grooves and that the belt is not twisted.
- Restore tension, reconnect the battery and briefly run the engine while checking belt tracking.
- Stop immediately if the belt walks off a pulley, squeals excessively or shows abnormal movement.
Troubleshooting & FAQ
How do I confirm that this belt fits my engine?
Compare the complete MerCruiser model and serial number with the applicable parts diagram or service information. Also verify the pulley arrangement, belt routing and accessory configuration, including the alternator and power-steering layout.
Why can the same engine displacement use a different belt?
Accessory mounting locations, pulley sizes, cooling equipment and belt-routing designs can vary within the same displacement family. Engine displacement by itself is not sufficient to confirm fitment.
What are common signs of a worn serpentine belt?
Squealing or chirping, visible cracking, fraying, glazing, rib damage and belt misalignment can indicate wear or an underlying pulley or tensioner problem. Inspect the complete drive system before installing a new belt.
Is this an OEM belt?
No. This listing is for an aftermarket replacement belt. The reference numbers are provided to help compare applications and should not be interpreted as a claim that the belt is manufactured by MerCruiser or Sierra.
Does the package include a tensioner, pulleys or installation tools?
No. The package contains one serpentine belt only. Tensioners, pulleys, fasteners and tools are not included.
Safety & Important Information
- Verify the model, serial number, pulley arrangement and belt routing before purchase.
- Do not operate the engine with a belt that is incorrectly routed or not fully seated.
- Inspect pulleys, tensioners and accessory bearings if the original belt failed prematurely.
- Professional installation is recommended when the correct routing or application is uncertain.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for a range of marine repair applications.
- Application-Focused Information — Use the listed reference numbers together with your engine model and serial number to verify fitment.
- Support When Needed — Contact our support team with your engine details if you need help comparing the application.
Payment & Security
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