Drive Belt for MerCruiser, Volvo Penta, OMC 17HP-350HP Models (57-74271Q)

OEM Part Numbers

0509306, 0509308, 57-68038, 57-74271Q, 57-74271T, 57-77274, 68038, 74271, 74271T, 77274A1, 960281, 966903

Compatible Models

MerCruiser

Four-Stroke Engines:

• 175/185/4.3L (1985-1992)
• 898/200/5.0L (1985-1995)
• 228/230/5.0L (1983-1995)
• 228/230/5.0L MIE (1978-1987)
• 255/260/5.7L MIE & Ski (1978-1986)
• 260/5.7L MIE & Ski (1987-1993)
• 260/5.7L (1983-1995)
• 350 MAG (1986-1995)
• 340 (7.4L) (1981-1992)

Volvo Penta

Four-Stroke Engines:

• 2001, 2001B, 2001AG, 2001BG (17-20HP)
• 2002, 2002B, 2002D, 2002AG, 2002BG (20-25HP)
• 2003, 2003B, 2003D, 2003AG, 2003BG, 2003T, 2003TB, 2003-SOLAS, 2003B SOLAS (25-30HP)
• MD17C 2001 Alt

Technical Specifications

• Size Information: Effective Length: 863mm (34") / 891mm (35.125"), Top Width: 9.5mm (3/8") / 11.5mm (29/64")

Installation Instructions

1. Ensure the engine is turned off and cooled completely.
2. Disconnect the battery to prevent accidental starting.
3. Loosen the alternator pivot bolt just enough to allow slight movement. Also loosen any adjuster‑plate or tensioner bolts.
4. Identify belt routing. Note the path around the crankshaft, water‑pump, alternator (and power‑steering if applicable) pulleys.
5. Remove the old belt by swiveling the alternator or tensioner to relieve tension, then slip the belt off pulleys.
6. Inspect pulley grooves for wear, rust or corrosion. Clean them to bare metal if needed.
7. Route the new belt following the same pulley path. Ensure it seats properly in all V‑grooves.
8. Tension the belt:
   • Swivel the alternator away from the engine to create proper belt tension.
   • A correctly tensioned V‑belt deflects about 1 cm (½″) under moderate thumb pressure on the longest span.
9. Tighten all bolts: Secure the adjuster‑plate bolt, then the main pivot bolt to factory torque specs.
10. Reconnect the battery.
11. Start the engine, observe belt tracking to ensure it’s centered in grooves and running smoothly.
12. Shut down and recheck tension after a short run. Re-tension if necessary (new belts may stretch slightly initially).

Important Notes

• Verify that the product images and specifications match your original part.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Warranty Information

This product comes with a 1-year warranty against manufacturing defects under normal use conditions. Please contact our customer service team for warranty claims or additional product information.

Product Features

• High Quality: Manufactured to OEM specifications using the exact same material as the originals.
• Production Standards: Produced in an ISO9002 certified factory.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5-15 days.
• Direct from Manufacturer: Enjoy competitive prices without compromising quality.

Product Features

• High Quality: Manufactured to OEM specifications using the exact same material as the originals.
• Production Standards: Produced in an ISO9002 certified factory.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5-15 days.
• Direct from Manufacturer: Enjoy competitive prices without compromising quality.

Don't compromise on quality or performance. Choose JLM MARINE for reliable, high-performance marine parts at unbeatable prices. Order now and experience the JLM difference!

Need help? Click the live support at the lower right corner of the webpage or email us your engine details for the right parts.