19210-ZV7-003 Water Pump Impeller with Key for Honda BF20A BF25A BF30A | JLM Marine

Water Pump Impeller with Key – Fits Honda BF20A, BF25A, BF30A Outboard Motors

This brand-new aftermarket water pump impeller with key is designed for Honda marine outboard engines in the 20–30 HP range. It provides reliable cooling system performance for BF20A, BF25A, and BF30A series motors across multiple model years and configurations.

This impeller directly replaces Honda OEM part number 19210-ZV7-003, as well as aftermarket equivalents from Sierra Marine (18-3249), Mallory Marine (9-45105), and CEF Marine (500339), ensuring broad cross-compatibility and easy sourcing.

• Includes both impeller and drive key for complete installation
• Designed for Honda 4-stroke outboard motors rated 20–30 HP
• Direct fit replacement requiring no modifications

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

• Outboard Impeller with Key

Installation Guide

1. Disconnect the fuel line and remove the engine cowling to access the lower unit. Tilt the engine to its maximum position for easier access.
2. Drain the lower unit gear oil by removing the drain and vent plugs. Disconnect the water intake hose if necessary.
3. Remove the water pump housing bolts and carefully separate the housing from the lower unit. Take note of the gasket orientation and condition.
4. Extract the old impeller from the pump housing, along with the old drive key from the driveshaft. Inspect the housing for scoring or damage.
5. Clean the pump housing and driveshaft thoroughly, removing any debris, old gasket material, or corrosion.
6. Insert the new drive key into the driveshaft slot, ensuring it sits flush and secure.
7. Lubricate the new impeller blades with glycerin, soapy water, or water pump grease (never petroleum-based products). Flex the blades in the direction of rotation.
8. Install the new impeller onto the driveshaft, aligning the key slot and rotating gently to seat the blades properly within the housing.
9. Replace the pump housing gasket and any O-rings with new ones included in your kit (if applicable).
10. Reassemble the water pump housing, torque bolts to manufacturer specifications in a cross pattern to ensure even seating.
11. Refill the lower unit gear oil, reconnect the water intake hose, and reinstall the cowling.
12. Test the engine on muffs or in the water, verifying strong water flow from the telltale indicator within 15 seconds of startup.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Honda outboard?
A: Cross-reference your engine model with the compatibility table above (BF20A, BF25A, BF30A series). You can also verify by checking your current impeller's OEM part number—if it matches 19210-ZV7-003 or any of the cross-reference numbers listed, this impeller will fit.

Q: How often should I replace my water pump impeller?
A: Honda recommends inspecting the impeller annually and replacing it every 2–3 years or 200–300 operating hours, whichever comes first. Replace immediately if you notice overheating, reduced water flow from the telltale, or if the engine has ingested sand or debris.

Q: What are the signs of a failing impeller?
A: Common symptoms include weak or no water discharge from the telltale indicator, engine overheating, steam from the cowling, or the temperature alarm sounding. Impellers can also fail silently, so regular preventive replacement is recommended.

Q: Can I install this impeller myself, or do I need a mechanic?
A: If you have basic mechanical skills and tools, you can install it yourself following the steps in the installation guide. However, if you're unfamiliar with lower unit disassembly or torque specifications, professional installation is recommended to avoid damage.

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.