Drive Belt – Fits MerCruiser & Volvo Penta 17-350HP (Replaces 57-74271Q, 966903)
Drive Belt – Fits MerCruiser & Volvo Penta 17-350HP (Replaces 57-74271Q, 966903) 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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Drive Belt – Fits MerCruiser & Volvo Penta 17-350HP (Replaces 5...
Drive Belt – Fits MerCruiser & Volvo Penta 17-350HP (Replaces 57-74271Q, 966903) is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality aftermarket Drive Belt – Fits MerCruiser & Volvo Penta 17-350HP (Replaces 57-74271Q, 966903) is engineered for a wide range of marine engines. It is designed for MerCruiser models from 175HP to 350HP (4-Stroke, including 4.3L, 5.0L, and 5.7L from 1978–1995) and various Volvo Penta 2001, 2002, and 2003 Series diesel engines (17-30HP), plus the MD17C (2001 Alt) from the 1980s–1990s.
This component serves as a direct interchange for MerCruiser part numbers 57-68038, 57-74271Q, 57-74271T, 57-77274, 68038, 74271, 74271T, 77274A1; Volvo Penta 960281, 966903; and OMC 0509306, 0509308.
- Installs on the engine accessory drive to operate components like the alternator, water pump, or power steering (varies by engine).
- Constructed from durable, high-strength rubber to meet demanding marine conditions.
- Protected by a 1-year warranty against manufacturing defects for peace of mind.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 57-68038 |
| MerCruiser | 57-74271Q |
| MerCruiser | 57-74271T |
| MerCruiser | 57-77274 |
| MerCruiser | 68038 |
| MerCruiser | 74271 |
| MerCruiser | 74271T |
| MerCruiser | 77274A1 |
| Volvo Penta | 960281 |
| Volvo Penta | 966903 |
| OMC | 0509306 |
| OMC | 0509308 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, please verify your engine's serial number falls within the specified range for a guaranteed fit.
For Volvo Penta, this belt fits the listed diesel engine series and specific MD17C applications.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 175/185/4.3L | 175-185 | 4-Stroke | 1985–1992 | 57-74271Q | Engine Serial A331455-D714106 |
| MerCruiser | 898/200/5.0L | 200 | 4-Stroke | 1985–1995 | 57-74271Q | Engine Serial 6218462-F600999 |
| MerCruiser | 228/230/5.0L | 228-230 | 4-Stroke | 1983–1995 | 57-74271Q | Engine Serial 6218462-F600999 |
| MerCruiser | 228/230/5.0L MIE | 228-230 | 4-Stroke | 1978–1987 | 57-74271Q | Engine Serial 4929030-B788151 |
| MerCruiser | 255/260/5.7L MIE & Ski | 255-260 | 4-Stroke | 1978–1986 | 57-74271Q | Engine Serial 4924565-B522505 |
| MerCruiser | 260/5.7L MIE & Ski | 260 | 4-Stroke | 1987–1993 | 57-74271Q | Engine Serial B522506-F024999 |
| MerCruiser | 260/5.7L | 260 | 4-Stroke | 1983–1995 | 57-74271Q | Engine Serial 6218462-F600999 |
| MerCruiser | 350 MAG | 350 | 4-Stroke | 1986–1995 | 57-74271Q | Engine Serial A635178-F600999 |
| MerCruiser | 340 (7.4L) | 340 | 4-Stroke | 1981–1992 | 57-74271Q | Engine Serial 5889914-D715493 |
| Volvo Penta | 2001, 2001B, 2001AG, 2001BG | 17-20 | 4-Stroke | 966903 | Diesel engines | |
| Volvo Penta | 2002, 2002B, 2002D, 2002AG, 2002BG | 20-25 | 4-Stroke | 966903 | Diesel engines | |
| Volvo Penta | 2003, 2003B, 2003D, 2003AG, 2003BG, 2003T, 2003TB | 25-30 | 4-Stroke | 966903 | Diesel engines, including SOLAS versions | |
| Volvo Penta | MD17C | 4-Stroke | 966903 | 2001 Alt application |
Technical Specs
- Product Type
- V-Belt
- Installation
- Engine Accessory Drive
- Dimensions
- Length: 863-891mm (34-35.125"), Width: 9.5-11.5mm (3/8"-29/64")
- Application
- Alternator, Water Pump, Power Steering (varies by engine)
- Material
- Rubber
- Belt Type
- V-Belt
- Warranty
- 1 year against manufacturing defects
What’s in the Box
- 1 x Drive Belt (57-74271Q/966903)
Installation Notes
- Disconnect the negative battery terminal to prevent accidental starts.
- Locate the drive belt routing diagram, usually on a sticker in the engine bay. If not present, sketch the current belt's path.
- Find the belt tensioner pulley and use the appropriate tool (e.g., a breaker bar or wrench) to release the tension.
- Carefully slide the old, worn belt off the pulleys.
- Inspect all pulleys for wobble, damage, or seizure. Spin them by hand to ensure they move freely and quietly.
- Route the new belt according to the diagram, starting with the crankshaft pulley and finishing with an easy-to-reach smooth pulley.
- Ensure the ribbed side of the belt is seated correctly in all grooved pulleys.
- Slowly release the tensioner, allowing it to apply the correct tension to the new belt.
- Double-check the entire belt path to confirm it is properly aligned on every pulley.
- Reconnect the battery, start the engine, and listen for unusual noises while visually ensuring the belt tracks correctly.
Troubleshooting & FAQ
How do I know if this belt is the right one for my engine?
First, cross-reference your engine's original part number with our Part Number Matrix. Second, check your engine model, HP, and year in the Engine & Model Compatibility table. For MerCruiser engines, verifying the serial number is the most reliable method. If you're still unsure, measure your old belt and compare it to the dimensions provided: Length: 863-891mm (34-35.125"), Width: 9.5-11.5mm (3/8"-29/64").
What are the signs of a failing drive belt?
Common symptoms include loud squealing or chirping noises from the engine, visible cracks or fraying on the belt's surface, a glazed or shiny appearance, or pieces of rubber missing. A failing belt can also cause poor performance of accessories like the alternator (dimming lights) or water pump (overheating).
How often should this belt be replaced?
While there is no universal schedule, we recommend inspecting the drive belt annually for signs of wear. As a general preventative measure, replacement every 3 to 5 years is a good practice, depending on engine hours and operating conditions. Always follow your engine manufacturer's specific service recommendations if available.
Is this belt different from the original OEM part?
This is an aftermarket part designed to function as a direct replacement for the original. It is manufactured to meet or exceed OEM specifications for fit, durability, and performance, offering a reliable and cost-effective alternative without compromising on quality.
What happens if I install the wrong size belt?
Installing an incorrect belt can lead to serious issues. A belt that is too long will slip, causing improper accessory function and generating excess heat that leads to premature failure. A belt that is too short will be difficult or impossible to install and will place excessive strain on the bearings of your alternator, water pump, and other pulleys, leading to their rapid failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our 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.
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