37-Inch V-Belt for MerCruiser 3.0L Alpha One & 3.0L MPI EC – Replaces 57-65607Q, 57-65607T
37-Inch V-Belt for MerCruiser 3.0L Alpha One & 3.0L MPI EC – Replaces 57-65607Q, 57-65607T 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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37-Inch V-Belt for MerCruiser 3.0L Alpha One & 3.0L MPI EC – Re...
37-Inch V-Belt for MerCruiser 3.0L Alpha One & 3.0L MPI EC – Replaces 57-65607Q, 57-65607T is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket 37-inch V-belt is designed for specified MerCruiser 3.0L Alpha One and MerCruiser 3.0L MPI EC applications. It is intended for the power-steering belt position where the listed engine, drive, and serial-number conditions apply.
The belt has an effective length of approximately 37 inches (940 mm) and a 29/64-inch top width. Confirm the complete engine and serial-number information before ordering.
It is listed as a replacement for MerCruiser references 57-65607Q, 57-65607T, 65607T, 57-65607, and 65607. Listed aftermarket references include Sierra 18-15370, Mallory Marine 9-55005, and OBR MR-624. Johnson/Evinrude references 0509302 and 509302 are also listed for cross-reference.
- Single replacement V-belt; not a pulley or belt kit.
- 37-inch belt length, approximately 940 mm.
- 29/64-inch top width.
- For the specified MerCruiser power-steering applications.
Part Number Matrix
Use these references as a cross-reference aid. Always verify the engine serial number and belt routing for your application.
| Reference Type | Brand or Source | Number |
|---|---|---|
| OEM reference | MerCruiser | 57-65607Q |
| OEM reference | MerCruiser | 57-65607T |
| OEM reference | MerCruiser | 65607T |
| OEM reference | MerCruiser | 57-65607 |
| OEM reference | MerCruiser | 65607 |
| Aftermarket reference | Sierra | 18-15370 |
| Aftermarket reference | Mallory Marine | 9-55005 |
| Aftermarket reference | OBR | MR-624 |
| Cross-reference | Johnson/Evinrude | 0509302; 509302 |
Engine & Model Compatibility
The company fitment record specifies the following MerCruiser applications. The model, drive, displacement, and serial-number conditions must be considered together.
| Brand | Engine / Drive | Displacement | Serial Number Condition | Application |
|---|---|---|---|---|
| MerCruiser | 3.0L Alpha One | 3.0L | 1A002000–1A020543 | Specified power-steering V-belt application |
| MerCruiser | 3.0L Alpha One | 3.0L | 1A020544 and up | Specified power-steering V-belt application |
| MerCruiser | 3.0L MPI EC | 3.0L MPI | 1A072812 and up | Specified power-steering V-belt application |
Important: MerCruiser engines can use different belts depending on the engine configuration, belt position, pulley arrangement, and serial number. A 3.0L or Alpha One designation by itself is not sufficient to confirm fitment.
Technical Specs
- Product Type
- V-belt
- Quantity
- 1 belt
- Application
- Specified MerCruiser power-steering belt position
- Effective Length
- 37 inches (approximately 940 mm)
- Top Width
- 29/64 inch
- Product Status
- Aftermarket replacement component
What’s in the Box
- 1 x 37-inch V-belt
Installation Notes
- Disconnect the battery and allow the engine to cool before beginning work.
- Confirm the engine model, drive, serial number, belt position, and pulley arrangement against the compatibility information and service manual.
- Record the original belt routing before removal.
- Release belt tension using the adjustment procedure specified for your engine.
- Remove the old belt and inspect the pulleys for damage, misalignment, contamination, or excessive wear.
- Install the new belt in the correct pulley grooves and follow the original routing.
- Set belt tension according to the applicable MerCruiser service manual; do not rely on a universal tension or deflection value.
- Tighten all adjustment and mounting fasteners to the service-manual specification.
- Reconnect the battery, run the engine briefly, and check belt tracking and abnormal noise before returning the boat to service.
Troubleshooting & FAQ
How do I confirm that this belt is correct?
Match the old belt’s verified reference number and dimensions, then confirm the complete MerCruiser model, drive, and serial-number range. For this listing, the specified applications are MerCruiser 3.0L Alpha One serial numbers 1A002000–1A020543, 1A020544 and up, and MerCruiser 3.0L MPI EC serial numbers 1A072812 and up.
Is this a complete belt kit?
No. This product is a single replacement V-belt. It does not include a pulley, tensioner, steering pump, or additional belts.
What are common signs that a V-belt needs replacement?
Inspect for cracking, fraying, glazing, missing material, contamination, or abnormal wear. Squealing, belt slip, poor tracking, or visible vibration can also indicate a worn belt or a pulley, alignment, or tension problem.
Can I use this belt on any MerCruiser 3.0L engine?
No. Belt selection can vary by serial number, drive, pulley arrangement, cooling configuration, and belt position. Use the specified fitment conditions rather than displacement alone.
Is this an original MerCruiser-branded part?
No. This is an aftermarket replacement belt listed against the referenced MerCruiser numbers and other cross-reference numbers.
Does the belt include installation hardware?
No. The box contains one V-belt only. Reuse or replace other hardware only as directed by the applicable service manual.
Safety & Important Information
- Verify the engine model, drive, serial number, belt position, routing, and dimensions before purchase and installation.
- Do not install the belt on an application that does not match the specified fitment conditions.
- Disconnect the battery before working near belts, pulleys, or rotating engine components.
- Use the applicable MerCruiser service manual for tension, torque, and adjustment specifications.
- This is an aftermarket replacement component and is not manufactured or branded by MerCruiser.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for repair and maintenance of marine engines and drive systems.
- Fitment-Focused Listings — Product information is organized around model, serial-number, dimensional, and application details.
- Practical Replacement Solutions — Cross-reference information helps customers compare replacement parts while supporting final verification against the original component and service documentation.
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