Power Steering V-Belt for MerCruiser 120/140 HP, 2.5L and 3.0L Engines – Replaces 57-65607Q
Power Steering V-Belt for MerCruiser 120/140 HP, 2.5L and 3.0L Engines – Replaces 57-65607Q is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Power Steering V-Belt for MerCruiser 120/140 HP, 2.5L and 3.0L Engi...
Power Steering V-Belt for MerCruiser 120/140 HP, 2.5L and 3.0L Engines – Replaces 57-65607Q is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality power steering V-belt is designed for selected MerCruiser 120 HP, 140 HP, 2.5L and 3.0L sterndrive applications. It provides reliable drive for the power steering system and is intended to help restore proper belt operation, tension and steering-assist performance when the original belt is worn or damaged.
This belt is listed as a replacement for Mercury/MerCruiser part numbers 57-65607Q, 57-65607 and 57-65607T. It is also cross-referenced with aftermarket number Sierra 18-15370. Confirm the original belt, pulley arrangement and engine application before ordering.
- Designed for power steering pump applications on listed MerCruiser engines.
- Rubber and fiber composite construction provides durable grip and service performance.
- Approximately 37 inches (940 mm) in length for applications requiring this belt size.
- Single replacement V-belt; no pulley, tensioner or installation hardware is included.
Part Number Matrix
Use the following references to compare the replacement belt with the number shown on your original part or application catalog.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 57-65607Q |
| Mercury/MerCruiser | 57-65607 |
| Mercury/MerCruiser | 57-65607T |
| Sierra | 18-15370 |
Engine & Model Compatibility
The compatibility information below reflects the listed MerCruiser applications associated with this replacement belt. Model names, production years and belt routing can vary by engine configuration and serial-number range. Verify the engine model, year, original part number and pulley layout before installation.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 120 | 120 | 4-Stroke | 1974–1982 | 57-65607Q | 153 CID / L4 engine application |
| MerCruiser | 120 | 120 | 4-Stroke | 1982–1986 | 57-65607Q | 153 CID / L4 engine application |
| MerCruiser | 2.5L | 120 | 4-Stroke | 1987–1989 | 57-65607Q | 153 CID / L4 engine application |
| MerCruiser | 140 | 140 | 4-Stroke | 1974–1982 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 140 | 140 | 4-Stroke | 1982–1999 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 3.0L | 140 | 4-Stroke | 1987–1994 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 3.0L | 140 | 4-Stroke | 1998–1999 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 3.0L | 140 | 4-Stroke | 1999–2008 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 3.0LX | 140 | 4-Stroke | 1990–1995 | 57-65607Q | 181 CID / L4 engine application |
| MerCruiser | 3.0LX | 140 | 4-Stroke | 1986–1997 | 57-65607Q | 181 CID / L4 engine application |
Technical Specs
- Product Type
- V-Belt
- Application
- Power steering system
- Construction
- Rubber/fiber composite
- Color
- Black
- Approximate Length
- 37 inches (940 mm)
- Fitting Type
- Standard V-belt
What’s in the Box
- 1 × Power steering V-belt
Installation Notes
- Disconnect the boat's battery cables and allow the engine to cool before beginning work.
- Locate the power steering pump and record the routing of the existing belt. A reference photo can be helpful.
- Loosen the tensioner pulley or the pump mounting bolts only enough to release belt tension.
- Carefully remove the old belt from the pulleys.
- Compare the replacement belt with the old belt and confirm the length, profile and width before installation.
- Route the replacement belt around the crankshaft, power steering pump and any applicable idler pulleys according to the engine's routing arrangement.
- Restore belt tension according to the engine manufacturer's service instructions. Avoid overtightening, which can damage bearings and pulleys.
- Tighten all mounting and tensioner fasteners to the manufacturer's specified torque.
- Reconnect the battery, start the engine and check that the belt tracks smoothly without squealing, slipping or wobbling.
Troubleshooting & FAQ
How do I know if this belt is correct for my engine?
Compare your engine model, year, serial-number information, original belt and pulley arrangement with the compatibility information above. This belt is listed for selected MerCruiser 120 HP, 140 HP, 2.5L and 3.0L applications used for power steering. If the original belt or routing differs, confirm the application with a qualified marine technician before ordering.
Is this belt for the alternator or power steering pump?
This listing is for the power steering belt. Your engine may use separate belts for the alternator, raw-water pump or other accessories. Confirm the belt's specific routing before installation.
What are the signs of a failing V-belt?
Common signs include squealing during operation, visible cracks, fraying, glazing, excessive looseness or a reduction in power steering assistance, especially at low engine speed. Replace a belt that shows damage or cannot be tensioned correctly.
How often should I replace my power steering belt?
Replacement intervals depend on operating conditions and the engine manufacturer's maintenance schedule. Inspect the belt during routine service and replace it if it is worn, cracked, frayed, glazed, stretched or contaminated with oil or fuel.
Is this an OEM belt?
This listing is for an aftermarket replacement belt, not a Mercury/MerCruiser-branded original equipment component. The listed OEM part numbers are provided as application references only.
How fast is shipping and what does it cost?
Shipping availability, delivery estimates and applicable charges are calculated at checkout based on the destination and selected service. Available expedited options, if any, will be displayed during checkout.
What is the warranty and return policy?
Warranty coverage and return eligibility are governed by the seller's current policies. Contact support with your order details if the belt arrives damaged or you need assistance confirming an application before installation.
Safety & Important Info
- Verify the engine model, year, serial-number information, original belt and pulley routing before ordering.
- Compare the replacement belt with the original part before installation.
- This is an aftermarket replacement, not a Mercury/MerCruiser-branded OEM component.
- Disconnect the battery and keep hands, clothing and tools away from moving belts and pulleys during operation.
- Professional marine-service installation is recommended when the correct routing or tension procedure is uncertain.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable performance in real-world service conditions.
- Global Fulfillment — Shipping options and delivery estimates are provided at checkout for the destination.
- Manufacturer-Direct Value — Practical replacement parts at competitive prices.
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