Belt Tensioner – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L Marine Engines (Replaces 3885250, 3587858)

Belt Tensioner – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L Marine Engines

This aftermarket serpentine belt tensioner is designed for a precise fit on a wide range of Volvo Penta and PCM/Crusader marine engines. It ensures the serpentine belt is kept at the correct tension for optimal performance of engine accessories.

Engineered as a direct replacement for Volvo Penta part numbers 3885250, 3587858, 3587859, and 3861010, as well as PCM/Crusader numbers RA068001 and R065057, this part ensures seamless installation and reliable operation.

• Installation: Direct OEM replacement part.
• Compatibility: Designed for gasoline (4-Stroke) marine engines.
• Material: Constructed from high-strength metal for durability.

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.

Volvo Penta Models

PCM/Crusader Models

Technical Specifications

Package Contents

• 1 x Belt Tensioner (3885250)

Installation Guide

1. Safety First: Disconnect the battery terminals to prevent any accidental starts.
2. Locate Tensioner: Identify the serpentine belt and the existing belt tensioner assembly in the engine bay.
3. Release Tension: Use a serpentine belt tool or a breaker bar on the tensioner pulley bolt to release the belt's tension.
4. Remove Belt: Carefully slide the serpentine belt off one of the pulleys. You do not need to remove it completely.
5. Unbolt Old Tensioner: Loosen and remove the mounting bolts securing the old tensioner to the engine block.
6. Install New Tensioner: Position the new tensioner and hand-tighten the bolts. Torque the bolts to the manufacturer's recommended specification.
7. Re-route Belt: Ensure the serpentine belt is correctly routed around all pulleys according to your engine's diagram.
8. Apply Tension: Use the tool to move the new tensioner and slide the belt back onto the final pulley. Release the tool to apply tension.
9. Final Check: Reconnect the battery. Start the engine and listen for any unusual noises and visually confirm the belt is tracking correctly.

Troubleshooting & FAQ

Q: How do I know if this belt tensioner will fit my engine?
A: This tensioner is designed for a broad range of Volvo Penta (4.3L, 5.0L, 5.7L, 8.1L) and PCM/Crusader (5.0L, 5.7L) engines. To ensure a perfect match, please consult the "Compatible Engine Models" table on this page and verify that your specific model is listed. Cross-referencing the OEM part number (such as 3885250, 3587858, or RA068001) is the most reliable method of confirmation.

Q: What are the common signs of a failing belt tensioner?
A: Key symptoms include a persistent high-pitched squealing or grinding noise from the engine area, visible excessive wear or fraying on the serpentine belt, and inconsistent performance from belt-driven accessories like the alternator, power steering pump, or water pump.

Q: What tools are required for installation?
A: Installation typically requires a standard socket set and a serpentine belt tensioner tool or a long-handled breaker bar to articulate the tensioner and release the belt. Always refer to your engine's service manual for specific tool requirements and torque specifications.

Q: OEM vs. Aftermarket?
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.