SKU: 39678218633

Serpentine Belt – Fits MerCruiser Alpha/Bravo V6/V8 Engines (Replaces 57-865615-003, 57-865615Q03)

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Description

Serpentine Belt – Fits MerCruiser Alpha/Bravo V6/V8 Engines (Replaces 57-865615-003, 57-865615Q03)Serpentine Belt Fits MerCruiser Alpha Bravo V6 V8 Engines (Replaces 57 865615 003, 57 865615Q03) This serpentine belt is designed for Mercury Marine MerCruiser 4. 3L, 5. 0L, 5. 7L, and 6. 2L V6 V8 engines (19992016). It is specifically compatible with Bravo and Alpha models equipped with sea pump cooling systems. This component is a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and function for specified

Serpentine Belt – Fits MerCruiser Alpha/Bravo V6/V8 Engines (Replaces 57-865615-003, 57-865615Q03)

This serpentine belt is designed for Mercury Marine/MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L V6/V8 engines (1999–2016). It is specifically compatible with Bravo and Alpha models equipped with sea pump cooling systems.

This component is a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and function for specified engine configurations.

  • Engine Accessory Drive Belt
  • Constructed from high-strength rubber cords for durability
  • Fits Alpha drives with closed cooling and Bravo drives with standard cooling

Part Number Cross-Reference

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

Brand Part Number
Mercury / MerCruiser 57-865615-003, 57-865615Q03
Quicksilver 865615Q03
Sierra 18-15100

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L V6 4-Stroke 1999-2016 57-865615-003, 57-865615Q03 Bravo engine or Alpha with sea pump
MerCruiser 5.0L V8 4-Stroke 1999-2016 57-865615-003, 57-865615Q03 Bravo engine or Alpha with sea pump
MerCruiser 5.7L V8 4-Stroke 1999-2016 57-865615-003, 57-865615Q03 Bravo engine or Alpha with sea pump
MerCruiser 6.2L V8 4-Stroke 1999-2016 57-865615-003, 57-865615Q03 Bravo engine or Alpha with sea pump
MerCruiser Alpha V6/V8 4-Stroke 2001-2016 57-865615-003, 57-865615Q03 With closed cooling
MerCruiser Bravo V6/V8 4-Stroke 2001-2016 57-865615-003, 57-865615Q03 With standard cooling (s/n 0M320025 and above)
MerCruiser 305 CID V8 4-Stroke 2001-2016 57-865615-003, 57-865615Q03 Alpha with closed cooling or Bravo with standard cooling
MerCruiser 350 CID V8 4-Stroke 2001-2016 57-865615-003, 57-865615Q03 Alpha with closed cooling or Bravo with standard cooling
MerCruiser 377 CID V8 4-Stroke 2001-2016 57-865615-003, 57-865615Q03 Alpha with closed cooling or Bravo with standard cooling

Technical Specifications

Specification Value
Product Type Serpentine Belt
Installation Engine Accessory Drive
Material High Strength Rubber Cords
Belt Length 2,704 mm (106.5 in)
Belt Type Serpentine/Multi-Rib
Compatibility Alpha with Sea Pump, Bravo Standard Cooling
Color Black
Warranty 1-year factory warranty against defects (Mercury/Quicksilver)
OEM Part Number 57-865615-003, 57-865615Q03

Package Contents

  • 1 x Serpentine Belt (57-865615-003, 57-865615Q03)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any work on the engine.
  2. Locate Components: Identify the serpentine belt, tensioner pulley, and the belt routing diagram (often on a decal on the engine).
  3. Release Tension: Use a wrench or socket on the tensioner pulley to release the belt's tension.
  4. Remove Old Belt: Carefully slide the old belt off the pulleys.
  5. Route New Belt: Following the routing diagram precisely, thread the new belt around the pulleys.
  6. Apply Tension: Slowly release the tensioner to apply pressure to the new belt.
  7. Final Check: Ensure the belt is properly seated in the grooves of all pulleys. Reconnect the battery and test the engine.

Troubleshooting & FAQ

How do I confirm this belt fits my engine?
Verify your engine model and year in the compatibility table above. The most critical factors are your drive type (Alpha or Bravo) and the specific cooling system (sea pump, standard cooling, or closed cooling). This belt fits very specific configurations.

What are the signs of a failing serpentine belt?
Common signs include a persistent high-pitched squealing sound from the engine, visible cracks or fraying on the belt's surface, and issues with engine accessories like the alternator or power steering pump.

How often should I replace my serpentine belt?
We recommend annual inspection for wear, cracks, or glazing. For replacement intervals, consult your engine's service manual, but a general guideline is to replace it every 300-500 operating hours or if any signs of wear are visible.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 39678218633

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4.3 ★★★★★
Based on 25 reviews
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Product Reviews
E
Verified Purchase
E. Schall
Cuba, US
★★★★★ 5
My dogs favorite balls
Size: Medium
These are great for my dog who always has to have a ball in her mouth. Not too hard so I don't have to worry about her teeth. They last for ever. They do lose their shape a little over time (like I said, she always has a ball in her mouth) they become a little oval in shape. They still bounce, she still chases it and she still chews on it so I don't think she notices or cares. I've gotten her a bag full of these over time and I have only seen one that she chewed a chunk out.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 28, 2023
K
Verified Purchase
Kimmie is happy
Bozeman, US
★★★★★ 5
My Dachshunds Love These
Size: Small
These balls are durable, flexible material, highly chewable without being easily destroyed. I stuff them with Milkbone Maro Snacks, which are just the right size to twist into the holes in the ball. My dogs literally get an hour+ chewing and chasing entertainment from these. They chew them, they sometimes 'pop' out of their mouths, go rolling across the floor, dogs chasing them. This satisfies their urge to hunt prey. Dachshunds can easily tear this kind of stuff-it-toy apart. These have lasted for a long time without tearing or shredding. I would NOT recommend them for a dog much larger than a tweenie weenie. They're a bit on the small side and might be swallowed by a larger dog. It would be cool it they also came in a larger size (and probably ball wall thickness also) for the bigger dogs to enjoy. These stuff-it chew balls are better than the kong balls my dogs had before these. Highly recommend them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2024
L
Verified Purchase
LJ
Los Angeles, US
★★★★★ 5
My puppy’s favorite fetch toy!
Size: Small
Update Aug 27, 2024: After 10 months, these are still his favorite ball. He’s obsessed with fetching and plays with them all day. They do bounce really high. Unfortunately, the small size aren’t available for sale anywhere anymore. I tried the medium size, and he has a bit of trouble hanging on to them, but he manages. Weirdly, he prefers the orange one, but he also plays with the blue one. My 7 month old Shih Tzu puppy loves to fetch, and these are his new favorites. They’re small enough to fit in his mouth, and they are made of hard plastic, so he’s able to hold on to them. They have a lot of bounce, and this adds to the fun for him. I highly recommend them.
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Reviewed in the United States on December 17, 2023
G
Verified Purchase
Genuinely
San Leandro, US
★★★★★ 4
Genuinely bummed that these great balls can’t stand up against my Chloè.
Size: Medium
I love all the Chuckit brand of balls. I found that the Strabo and glow balls in the Chuckit line are the softest, and as such, don't last as long as the rest of Chuckit line of balls. Having said that, they do last longer than than every other brand I've tried (and I do believe I’ve tried every brand available on the market today.) The strato balls do bounce higher than any of the other balls in the Chuckit line. They really are a good value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2022
D
Verified Purchase
Debbie
West Palm Beach, US
★★★★★ 5
Great dog balls at a great price
Size: Medium
The balls are a favorite for my dog. I could have done without the hole through the middle because I don't do treats in balls anyway. My dog loves balls for their own merit. I needed replacement balls for my Nerf Dog Ball launcher. It seems the originals have disappeared from the market. I took a chance because the price is right and this Chuck-it ball works very well so we're liking this ball a lot. So far my Dachsund, who can destroy a tennis ball (the kind they are selling as Nerf Dog replacements) in 3 minutes has not done any damage to this one so that's a win. I recommend this as a much better ball than the fuzzy tennis balls. I like the colors too since many dog toys are green (which gets lost in the lawn, etc.) or red (even though dogs have red/green color blindness. Blue and orange are good and pretty easy to find. I liked these well enough that this set was my second purchase so I will have spares in case the others are lost.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2023

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