Impeller Kit with 4-Hole Gasket – Fits Volvo Penta Marine Engines

Impeller Kit with 4-Hole Gasket – Fits Volvo Penta Marine Engines (Replaces 875575, 855901)

This aftermarket impeller kit is designed for a wide range of Volvo Penta marine engines from the 1970s to the 1990s, including the AQ115-AQ171 series, 230A-251A models, BB115-BB170 series, and MB20/MD21 models.

It serves as a direct replacement for several OEM and aftermarket part numbers, ensuring compatibility and reliable performance for your raw water cooling pump.

• Complete Kit: Includes one neoprene impeller and one 4-hole gasket for a full replacement.
• Direct Fitment: Engineered to replace Volvo Penta 875575 / 21951350 / 831182 and Sierra 18-3075.
• Durable Construction: Features a flexible neoprene impeller with 12 blades and a corrosion-resistant brass insert.

Part Number Cross-Reference

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

Compatible Engine Models

For Volvo Penta Engines:

Confirm your engine model/year in the table below.

For Johnson Pumps:

The impeller also fits the following Johnson pump models. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

Technical Specifications

Package Contents

• 1x Impeller (Replaces 875575/21951350/831182)
• 1x 4-Hole Gasket (Replaces 855901)

Installation Guide

1. Safety First: Disconnect the engine's battery and close the raw water intake seacock before beginning work.
2. Access the Pump: Locate the raw water pump on your engine and remove the screws from the pump's faceplate cover.
3. Remove Old Impeller: Carefully pull out the old impeller using needle-nose pliers or an impeller puller tool. Note the orientation of the blades for reassembly.
4. Inspect and Clean: Clean the inside of the pump housing and the cover plate, removing any old gasket material or debris. Inspect the housing for scoring or damage.
5. Install New Gasket: Place the new 4-hole gasket onto the pump housing, ensuring it is correctly aligned.
6. Insert New Impeller: Lightly lubricate the new impeller with a water-based lubricant or glycerin. Insert it into the housing, rotating the shaft in the direction of engine operation to bend the blades correctly.
7. Reassemble: Reinstall the cover plate and tighten the screws evenly in a star pattern to ensure a proper seal. Do not overtighten.
8. Final Checks: Open the seacock and reconnect the battery. Start the engine and immediately check for any water leaks around the pump housing and verify strong water flow from the exhaust.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: We recommend cross-referencing your existing impeller’s part number with our list of direct replacements (Volvo Penta 875575, 21951350, 831182, and Sierra 18-3075). You should also verify that your engine model is included in the compatibility list provided on this page.

Q: What are the signs that my impeller needs replacement?
A: Key indicators of a worn or failing impeller include engine temperatures rising above normal, a noticeable reduction in water flow from the exhaust outlet, or finding pieces of old impeller blades in the cooling system. Visible signs on the impeller itself include cracks, tears, missing blades, or a stiff, brittle texture.

Q: How often should I replace my water pump impeller?
A: As a crucial part of your engine's cooling system, the impeller should be inspected at least once a year. We recommend replacing it every one to two seasons of use, or more frequently if you operate your boat in sandy, silty, or debris-heavy waters.

Q: Is this an OEM part?
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.