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Serpentine Belt Idler Pulley for Mercruiser V6 & V8 Engines (1996-2025) (8M6500024)
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OEM Part Numbers
818382, 865598, 8M6500024
(Replaces 865598 and 818382)
Compatible Models
Mercruiser
- 4.3L V6 (262 CID) (1996–2025, 190–220 HP)
- 5.0L V8 (305 CID) (1996–2020, 220–260 HP)
- 5.7L V8 (350 CID) (1996–2025, 250–350 HP)
- 5.8L V8 (2000–2010, 320–380 HP)
- 6.2L V8 (377 CID) (2009–2025, 300–350 HP)
- 8.1L V8 (496 CID) (1996–2020, 375–425 HP)
General Motors
- 262 CID (4.3L) V6 (Vortec 4300 series) (1996–2014)
- 305 CID (5.0L) V8 (Small block Chevrolet engine) (1976–1995)
Drives: Alpha One, Alpha One Gen II, Bravo One, Bravo Two, Bravo Three
Explosion Diagram
Technical Specifications
| Specification | Value |
|---|---|
| Material | Thermoplastic resin composite (PA6/POM + 15-20% glass fiber) |
| Outer Diameter | 3.00 inches (76.2 mm) |
| Inner Diameter | 5/8 inches (15.875 mm) |
| Width | 1.00 inch (25.4 mm) |
| Total Thickness | 1.25 inches (31.75 mm) |
| Weight | 0.23 lb (104 g) |
| Bearing Type | Sealed deep groove ball bearing (ABEC-3) |
| Max RPM | 8000 RPM |
| Radial Load Capacity | 500 N |
| Operating Temperature | -30°C to +120°C |
| Bearing Life | 3000 hours |
| Salt Spray Certification | ASTM B117 (1000 hours) |
| Quality Standard | ISO9002 |
Package Contents
- 1 × Serpentine Belt Idler Pulley
- Protective packaging materials
Installation Instructions
- Disconnect the battery before beginning.
- Release tension from the serpentine belt using the tensioner tool.
- Remove the serpentine belt from the pulley system.
- Clean the mounting surface to ensure proper contact.
- Remove the existing pulley mounting bolt using appropriate socket tools.
- Install the new pulley onto the mounting bracket.
- Torque the mounting bolt to 15-25 Nm using a torque wrench.
- Confirm pulley rotation is smooth without binding.
- Verify alignment with other pulleys (≤0.5mm tolerance).
- Reroute the serpentine belt following the engine diagram.
- Apply proper tension to the belt per specifications.
- Reconnect battery and test engine operation.
Important Notes
- Verify all images match your specific part before installation.
- This is an aftermarket replacement part; not original manufacturer equipment.
- Professional installation is recommended for optimal performance and safety.
Warranty Information
This product comes with a 1-year warranty against manufacturing defects under normal use conditions. Contact our customer service team for warranty claims or additional information.
Product Features
- High Quality: Manufactured to OEM specifications using identical materials.
- Production Standards: ISO9002 certified factory production.
Why Choose JLM MARINE?
- Quality Assured: 20+ years as trusted manufacturer for top marine brands.
- Fast Global Shipping: Free worldwide delivery in 5-15 days.
- Direct from Manufacturer: Competitive pricing without quality compromises.
Don't compromise on performance. Choose JLM MARINE for reliable marine parts at unbeatable prices. Order today to experience the JLM difference!
Need help? Click the live support button or email your engine details for expert part matching.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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