Water Pump Impeller Kit – Fits Volvo Penta 3.0, 4.3, 5.0, 5.7 V6/V8 Engines (Replaces 3862281, 21951346)

Water Pump Impeller Kit – Fits Volvo Penta 3.0, 4.3, 5.0, 5.7 V6/V8 Engines

This flexible impeller kit is a direct replacement for Volvo Penta gasoline V6 and V8 engines within the 3.0L to 5.7L range. It is specifically designed for models manufactured before 2005 that utilize a 12-blade, 12-spline drive impeller configuration.

This part replaces multiple manufacturer part numbers, including Johnson, Jabsco, Sierra, and Volvo Penta equivalents.

• Installation: Direct OEM replacement fit.
• Compatibility: For specific Volvo Penta V6/V8 engines (pre-2005).
• Complete Kit: Includes a 12-blade impeller, O-rings, and gaskets for a full service.

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.

Technical Specifications

Package Contents

• 1 x 12-Blade Spline Drive Impeller
• 2 x O-ring (Replaces 825940/ORG0052)
• 4 x Gaskets

Installation Guide

1. Disconnect the Battery: Ensure the engine's battery is disconnected to prevent accidental starts.
2. Close the Seacock: Locate and close the raw water intake valve (seacock) to prevent water from entering the vessel.
3. Access the Pump: Locate the raw water pump on the engine. You may need to remove other components for access.
4. Remove the Cover Plate: Unscrew the bolts holding the pump's cover plate in place. Be prepared for some residual water to spill out.
5. Extract the Old Impeller: Use impeller pullers or two pairs of pliers to grip the hub and pull the old impeller straight out. Avoid gouging the pump housing.
6. Clean and Inspect: Clean any debris from the pump housing and inspect it for scoring or damage. Ensure all pieces of the old impeller are accounted for.
7. Lubricate and Install New Impeller: Lightly lubricate the inside of the housing and the new impeller with a water-resistant grease or dish soap. Insert the new impeller, bending the blades in the direction of the pump's rotation.
8. Install New Gasket/O-Ring: Place the new gasket or O-ring onto the pump body, ensuring it is seated correctly.
9. Replace the Cover: Reinstall the cover plate and tighten the screws in a star pattern to ensure even pressure. Do not overtighten.
10. Reconnect and Test: Re-open the seacock. Reconnect the battery. Start the engine and immediately check the pump and exhaust for proper water flow and for any leaks around the cover plate.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: This impeller fits pre-2005 Volvo Penta 3.0L, 4.3L, 5.0L, and 5.7L gasoline engines that use a 12-spline drive pump. The most reliable method is to match your existing part number to one of the numbers listed in our cross-reference table. Please verify fitment before purchasing.

Q: What are the common signs of a worn or failing water pump impeller?
A: Key indicators include the engine running hotter than normal, a noticeable reduction in water flowing from the exhaust outlet, or visible cracks, stiffness, or missing blades upon inspection of the impeller itself.

Q: How often should I replace the impeller?
A: As a preventative maintenance item, we recommend inspecting your impeller annually and replacing it every 1-2 seasons of use. For boats operated in saltwater or in water with heavy sand or silt, a more frequent replacement interval is advisable.

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.