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 (Replaces 3885250, 3587858)

This aftermarket serpentine belt tensioner is designed for a wide range of Volvo Penta marine engines, including 4.3L, 5.0L, 5.7L, 8.1L, V6-225, and V8-270/300/320 models manufactured between 2003 and 2011. It also fits equivalent PCM/Crusader marine engines that use the RA068001 part number.

This component is a direct replacement for Volvo Penta part numbers 3885250, 3587858, 3587859, and 3861010, along with PCM/Crusader RA068001, ensuring a precise fit and restoring proper belt tension to prevent slippage and squealing.

• Installation Type: Direct OEM replacement
• Primary Function: Maintains correct tension on the serpentine belt
• Common Symptom Resolution: Fixes squealing belts caused by a weak or failing tensioner

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 vessel's battery before beginning work.
2. Locate Tensioner: Identify the serpentine belt tensioner on the front of the engine.
3. Release Tension: Use a breaker bar or serpentine belt tool to rotate the tensioner and release the tension on the belt.
4. Remove Belt: Carefully slip the belt off one of the accessory pulleys. You do not need to remove it completely.
5. Unbolt Old Tensioner: Remove the mounting bolt(s) securing the old tensioner to the engine block.
6. Clean Surface: Thoroughly clean the mounting surface on the engine block to ensure the new tensioner sits flush.
7. Install New Tensioner: Position the new tensioner and tighten the mounting bolt(s) to the manufacturer's specified torque.
8. Re-route Belt: Ensure the serpentine belt is correctly routed on all pulleys according to your engine's belt diagram.
9. Apply Tension: Rotate the new tensioner to allow the belt to be slipped back into place. Release the tool to apply tension.
10. Final Check: Double-check that the belt is properly seated in the grooves of all pulleys.
11. Test: Reconnect the battery, start the engine, and listen for any abnormal noises while visually confirming the belt is running true.

Troubleshooting & FAQ

Q: How do I know if this belt tensioner will fit my engine?
A: This tensioner fits a wide range of Volvo Penta 4.3L, 5.0L, 5.7L, and 8.1L engines (approx. 2003-2011) and equivalent PCM/Crusader models. The best method is to confirm your old part number matches one of the direct replacements like 3885250, 3587858, or RA068001. Please review the detailed compatibility tables on this page to verify your specific engine model.

Q: My engine belt is constantly squealing. Can this part fix that?
A: Yes, a persistent squeal is a classic symptom of a worn-out or weak belt tensioner that can no longer maintain adequate pressure on the belt. Replacing the tensioner is often the correct solution for this problem, assuming the belt itself is in good condition.

Q: Is this a genuine Volvo Penta or PCM part? The price seems much lower.
A: This is a high-quality aftermarket part, not an OEM component. It is engineered to meet or exceed original equipment specifications for performance and fit, offering a reliable and cost-effective alternative to dealer parts.

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.