V-Belt – Fits MerCruiser & OMC 120-165HP, 2.5L-3.0L (Replaces 57-65607Q, 0509302)
V-Belt – Fits MerCruiser & OMC 120-165HP, 2.5L-3.0L (Replaces 57-65607Q, 0509302) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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
V-Belt – Fits MerCruiser & OMC 120-165HP, 2.5L-3.0L (Replaces 5...
Product Details
This power steering V-Belt fits MerCruiser & OMC 120HP, 140HP, 165HP, and 3.0L engines produced between 1974 and 2010. It is engineered as a reliable, direct-fit replacement for models equipped with a power steering pump, ensuring proper performance and belt tension.
It directly replaces MerCruiser part numbers 57-65607Q, 57-65607T, 65607Q, 65607T and OMC part number 0509302.
- Installs on the power steering pump assembly.
- Measures 37 inches (940mm) in length.
- Designed for use with metal power steering pump assemblies.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 57-65607Q |
| MerCruiser | 57-65607T |
| MerCruiser | 65607Q |
| MerCruiser | 65607T |
| OMC | 0509302 |
| Sierra | 18-15370 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, check your model, serial number range, and whether your engine is equipped with a power steering system, as specified in the notes.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 120 | 120 | 4-Stroke | 1974–1982 | 57-65607Q | SN 3770650-6229717 |
| MerCruiser | 120 (2.5L) | 120 | 4-Stroke | 1982–1989 | 57-65607Q | SN 6229718-C853255, With Power Steering |
| MerCruiser | 140 | 140 | 4-Stroke | 1974–1982 | 57-65607Q | SN 3770650-6229717 |
| MerCruiser | 140/3.0L/3.0LX | 140 | 4-Stroke | 1982–1999 | 57-65607Q | SN 6229718-Up, With Power Steering |
| MerCruiser | 3.0L/3.0LX/3.0L MPI | 130-140 | 4-Stroke | 1987–2010 | 57-65607Q | With Power Steering |
| MerCruiser | 165 | 165 | 4-Stroke | 1974–1981 | 57-65607Q | SN 3774865-5813433 |
Technical Specs
- Product Type
- V-Belt
- Installation
- Power Steering Pump
- Dimensions
- 37 inches (940mm) length, 29/64 inch width
- Housing Color
- Black
- Other Technical Attributes
- For use with metal power steering pump assembly
What’s in the Box
- 1 x V-Belt (Replaces 57-65607Q)
Installation Notes
- For safety, disconnect the boat's battery terminals before starting.
- Locate the existing power steering V-belt and note its routing path around the pulleys. Taking a photo can be helpful.
- Loosen the adjustment bolt on the tensioner or alternator assembly to release tension on the old belt.
- Carefully slide the worn belt off all pulleys.
- Inspect the pulleys for any signs of damage, wobble, or grease buildup. Clean them with a rag.
- Route the new V-belt according to the path you noted earlier, ensuring it is properly seated in each pulley's groove.
- Re-apply tension to the belt as specified in your engine's service manual (a general rule is about ½ inch of deflection with moderate thumb pressure).
- Tighten all adjustment and mounting bolts securely.
- Reconnect the battery, start the engine, and check for proper belt tracking and listen for any unusual noises.
Troubleshooting & FAQ
How do I know if this V-Belt is correct for my engine?
The best method is to match your old part number to those in our Part Number Matrix. Additionally, cross-reference your engine model and serial number with our compatibility table. If you are still unsure, measure the outer circumference of your old belt; it should be approximately 37 inches.
What are common signs that a V-Belt needs replacement?
Look for visible signs of wear such as cracking, fraying, glazing (a shiny, smooth surface), or missing sections. Audible symptoms include a loud squealing noise on startup or when turning the steering wheel, which indicates the belt is slipping.
How often should I replace my power steering V-Belt?
There is no fixed replacement interval. It is best practice to inspect the belt during every routine engine service (e.g., annually or every 100 hours of operation). Replace it proactively at the first indication of wear to avoid an unexpected failure on the water.
Is this belt the same as the OEM MerCruiser part?
This is an aftermarket component designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, function, and durability. It serves as a direct replacement for MerCruiser part 57-65607Q and other listed numbers but is not an original MerCruiser-branded part.
How is OEM vs. Aftermarket quality controlled?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most destinations; expedited options will appear at checkout if available for your location.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears on the compatibility list—do not order.
- This product is an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component.
- Professional installation is highly recommended for safety and to ensure peak performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — Our model provides fair pricing without compromising on materials, quality control, or durability.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
