SKU: 76461810701

Serpentine Belt Idler Pulley – Fits MerCruiser 4.3, 5.0, 5.7, 6.2L V6/V8 Engines (Replaces 864625T)

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Description

Serpentine Belt Idler Pulley – Fits MerCruiser 4.3, 5.0, 5.7, 6.2L V6/V8 Engines (Replaces 864625T)Serpentine Belt Idler Pulley Fits MerCruiser 4. 3, 5. 0, 5. 7, 6. 2L V6 V8 Engines This serpentine belt idler pulley is designed for a wide range of Mercury MerCruiser V6 and V8 engines, including 4. 3L, 5. 0L, 5. 7L, and 6. 2L models in both stern drive and inboard configurations. It serves as a direct, reliable replacement for worn or damaged original pulleys. This component is a direct replacement for the following OEM and aftermarket part numbers:

Serpentine Belt Idler Pulley – Fits MerCruiser 4.3, 5.0, 5.7, 6.2L V6/V8 Engines

This serpentine belt idler pulley is designed for a wide range of Mercury MerCruiser V6 and V8 engines, including 4.3L, 5.0L, 5.7L, and 6.2L models in both stern drive and inboard configurations. It serves as a direct, reliable replacement for worn or damaged original pulleys.

This component is a direct replacement for the following OEM and aftermarket part numbers: Mercury/MerCruiser 864625T, 807757T, and Sierra 18-6457.

  • Engineered for a direct fit, simplifying installation.
  • Restores proper serpentine belt tension and alignment.
  • Includes one idler pulley assembly.

Part Number Cross-Reference

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

Brand Part Number
Mercury/MerCruiser 864625T
Mercury/MerCruiser 807757T
Sierra 18-6457

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 OEM Part No. Notes
MerCruiser 4.3L 190-220 4-Stroke 864625T V6 Engine
MerCruiser 5.0L 220-260 4-Stroke 864625T V8 Engine
MerCruiser 5.7L 260-300 4-Stroke 864625T V8 Engine
MerCruiser 6.2L 320 4-Stroke 864625T V8 Engine

Technical Specifications

Specification Value
Product Type Serpentine Belt Idler Pulley
Installation Direct replacement
Dimensions 4.25" diameter (108 mm)
Weight 0.38 lbs (0.17 kg)
Fitting Type Direct mount

Package Contents

  • 1 x Idler Pulley (864625T)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any work.
  2. Relieve Belt Tension: Use a breaker bar or belt tensioner tool to release the tension on the serpentine belt.
  3. Remove the Belt: Carefully slide the serpentine belt off the idler pulley and other accessory pulleys.
  4. Unbolt the Old Pulley: Use a socket wrench to remove the mounting bolt holding the old idler pulley in place.
  5. Clean Mounting Surface: Wipe down the mounting bracket to ensure it is free of dirt and corrosion.
  6. Install the New Pulley: Position the new idler pulley and tighten the mounting bolt to the manufacturer's recommended torque specification.
  7. Reinstall the Belt: Route the serpentine belt according to your engine's diagram. Ensure it is seated correctly on all pulleys.
  8. Apply Tension: Slowly release the tensioner to apply pressure to the newly installed belt.
  9. Final Check: Verify the belt is properly aligned and has the correct tension. Reconnect the battery and start the engine to check for proper operation.

Troubleshooting & FAQ

How do I confirm this fits my engine?
First, check your engine model against the "Compatible Engine Models" table. Second, cross-reference your existing part number with the numbers listed in the "Part Number Cross-Reference" section to ensure it is a direct replacement for 864625T, 807757T, or 18-6457.

What are the signs of a failing idler pulley?
Common symptoms include a persistent squeaking, chirping, or grinding sound from the engine bay, visible wobble or play in the pulley, or a serpentine belt that repeatedly slips or appears loose.

How often should I replace the idler pulley?
It is best practice to inspect the idler pulley whenever you service the serpentine belt. We recommend replacing it if it shows any signs of wear, damage, or noise, or as a preventative measure during a complete serpentine belt system overhaul.

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: 76461810701

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4.5 ★★★★★
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Georzetta
San Leandro, US
★★★★★ 5
Durable
This is the best dog toy I have ever bought! I got my 1st one in 2013 and it still squeaks. Admittedly, there is only one squeaker left but it still works. My dog has played with this silly snake more than any other toy she has. My friend often brings her dog when she visits and then the 2 dogs play tug-of-war with the snake. These are small dogs;, one is a pug and one is a small mixed breed that weighs about 15 pounds. They pull and tug with all their might. Even so, my first snake has no rips or tears. The only thing wrong is that most of the squeakers have given up the ghost. That's why I decided to replace snake. I don't think my pug noticed the difference. I washed it as soon as it came out of the package just to make sure there was no residual die in the fabric as I knew my dog would have it in her mouth ASAP. I don't put my dog toys in the dryer but they just have to be washed from time to time. So, all is well with snake except that he is much louder now that all of his parts work. That's the other thing, don't buy this toy if you can't stand the noise.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2016
T
Verified Purchase
tm13
Cuba, US
★★★★★ 5
Dog LOVES this toy
My dog, a Husky/Carolina dog mix, LOVES squeaky toys. Probably more than me, to be honest. Any squeak sound he hears throws him into "I must destroy it" mode. So, for Christmas, I purchased him this Outward Hound Kyjen Invincibles Plush Snake. He. Went. Insane. It was love at first bite. He was squeaking and chewing it all day. However, as I figured, this toy is not invincible. He's already shredded a good portion of it. I had to vacuum up pieces. Luckily, he's never been one to swallow pieces, but I have other dogs who might, so I have to keep a watch on it. If you have a dog who eats pieces, watch them carefully. Fabric can cause blockages in the stomach or intestines of the dog. Overall, this was a great gift for my pup, and I recommend it to other humans with squeaky-toy-loving doggies.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 28, 2015
C
Verified Purchase
Cody Davis
Alexandria, US
★★★★★ 5
Great toy
Great toy. My two German shepherds love it and it lasts a long time
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 16, 2026
S
Verified Purchase
SavvvyShopper
San Leandro, US
★★★★★ 4
Well Made Toy But My Standard Poodle Chewed Through it Anyway!
We have a standard poodle puppy that chews EVERYTHING! There isn't anything that she can't chew through - leashes, harnesses, toys - you name it and she tears it apart and if it's a toy, de-squeaks it and tears all the stuffing out. She has very powerful jaws! Now I have a couple of other Outward Hound toys that are made only of firehose material and those are still intact. But she loves the feel of the plush toys so I thought this seemed very durable and the inner part was of their Dura-Tuff liner, so I was hoping this would be a win win situation! The toy came and it IS well made and the outside plush is soft and inviting for the dog. Squeakers in every segment is a huge bonus with my dog as she loves squeakers. And no stuffing. Those nice qualities aside, after several weeks, she did manage to rip it apart, shred the material and de-squeak it! For an average dog or puppy, this might have worked wonderfully and lasted the entire lifetime. I still think its a quality made toy, but it just didn't last for my girl!! If this review has helped you in any way, please check yes at the bottom of the review.
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Reviewed in the United States on July 8, 2016
A
Verified Purchase
Ash
Houston, US
★★★★★ 5
The joy my dog gets from these toys is priceless!
I have a 5 year old Rottweiler, Poppy, who will absolutely annihilate any toy within minutes. I’ve had them all… same outcome. Stuffing all over within seconds and the enjoyment is short lived. I love these toys. There are several squeakers in them so once she gets ones out, she still loves the toy because she can find another squeaker. Also, because it’s long (yet substantially sized) she LOVES throwing them around and whipping them back and forth - something she does even after all the squeakers are gone. That alone makes this toy worth it. She typically no longer plays with toys once the squeaker or stuffing are removed but she will continue to whip these snake toys around and they’re durable. I don’t have to worry about her eating small pieces of cloth that is ripping off the toy. Having said all of that…. I’ve ordered her a few over the last several months and found that these toys are her favorite above all else. I’ve also found them to be a good value for me. But… if I could give these toys 25 stars, I would. My Poppy girl was recently diagnosed with hemangiosarcoma and will have about 6 more precious weeks with us, if we’re lucky. So, I ordered her two more. Because, she can have all the toys, right? And the pure amount of joy that lights up her beautiful face every-time she gets a new snake is priceless. I will absolutely continue to order them to make her remaining weeks as delightful as possible. I will be forever grateful for the happiness these specific snake toys bring my baby girl and could not recommend them enough.
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Reviewed in the United States on April 30, 2025

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