57-816295Q V Belt for MerCruiser 4.3L 5.0L 5.7L | JLM Marine

V Belt for MerCruiser 4.3L 5.0L 5.7L | 57-816295Q

This V belt is engineered for MerCruiser sterndrive engines, delivering reliable power transfer across a wide range of models including 4.3L, 5.0L, and 5.7L platforms from the mid-1980s through 1996. Designed to meet the demanding conditions of marine propulsion systems, it ensures consistent performance for both carbureted and fuel-injected configurations.

This belt serves as a direct aftermarket replacement for MerCruiser OEM part numbers 57-816295Q, 57-816295T, 816295Q, and 816295T, as well as Sierra Marine part number 18-15490. It is compatible with Alpha and Bravo sterndrive applications across multiple engine generations.

• Fits MerCruiser 4.3L, 5.0L, and 5.7L sterndrive engines (1983–1996)
• 52.5-inch V belt designed for marine environments
• Replaces multiple OEM and aftermarket part numbers for broad coverage

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

Your order includes the following component:

• 1 x 52.5" V Belt

Installation Guide

1. Disconnect the battery and ensure the engine is completely cool before starting work.
2. Locate the existing V belt routing around the pulleys and note the configuration for reference.
3. Loosen the tensioner or alternator mounting bolts to relieve tension on the old belt.
4. Remove the old belt by sliding it off the pulleys carefully.
5. Inspect all pulleys for wear, cracks, or damage; clean any debris from pulley grooves.
6. Route the new 52.5" V belt around the pulleys following the original path.
7. Ensure the belt seats properly into each pulley groove without twisting.
8. Adjust the tensioner or alternator position to achieve proper belt tension per manufacturer specifications.
9. Tighten all mounting bolts securely once correct tension is achieved.
10. Manually rotate the pulleys to confirm smooth operation and proper alignment.
11. Reconnect the battery and start the engine to verify the belt runs without slipping or unusual noise.
12. Recheck belt tension after the first hour of operation and adjust if necessary.

Troubleshooting & FAQ

Q: How do I confirm this belt fits my MerCruiser engine?
A: Cross-reference your engine model and year with the compatibility table above. If your engine matches any listed configuration (4.3L, 5.0L, or 5.7L from 1983–1996), and your original belt is 52.5 inches, this part will fit. You can also verify by checking your current belt's OEM part number against our cross-reference table.

Q: What are the signs that my V belt needs replacement?
A: Common symptoms include squealing noises during acceleration, visible cracks or fraying on the belt surface, glazing or shiny appearance, loss of charging system performance, or belt slippage under load. Inspect your belt regularly for wear and replace it if any of these conditions are present.

Q: How often should I replace this V belt?
A: MerCruiser recommends inspecting drive belts annually or every 100 hours of operation. Replace the belt every 2–3 years or sooner if you notice cracking, fraying, glazing, or loss of tension. Marine environments accelerate wear, so more frequent inspection is advisable for boats in saltwater or high-use conditions.

Q: Will this aftermarket belt perform the same as the original MerCruiser belt?
A: Yes, this belt is manufactured to OEM specifications using comparable materials and construction methods. It provides equivalent power transfer and durability for your sterndrive system. While it is not an OEM component, it meets the performance standards required for MerCruiser applications.

Q: Can I install this belt myself or do I need a mechanic?
A: If you have basic mechanical skills and tools, you can install this belt yourself by following the installation guide. However, proper tensioning is critical for performance and longevity. If you're unfamiliar with belt replacement or tensioning procedures, professional installation is recommended.

Q: Is this an OEM part or an aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

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: Competitive pricing without compromising quality.