Water Pump Impeller Seal – Fits Honda 30HP 35HP 40HP 45HP 50HP (Replaces 91356-ZV5-000)

Product Details

This Water Pump Impeller Seal is an aftermarket replacement designed to fit Honda marine outboards ranging from 30HP to 50HP. Compatible with BF35A, BF40A, BF40D, BF45A, BF50A, and BF50D models across all production years, this seal ensures reliable protection and performance in your lower unit cooling system.

Direct interchange for Honda OEM part number 91356-ZV5-000, offering a cost-effective alternative without sacrificing quality or fitment precision.

• Essential component for maintaining water pump integrity and preventing coolant leaks
• Manufactured to OEM-level specifications for reliable sealing performance
• Suitable for both saltwater and freshwater marine environments

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

OEM Replacement For

Honda 91356-ZV5-000

Application

Water pump impeller seal

Compatible Brands

Honda Marine Outboard

Horsepower Range

30HP – 50HP

What's in the Box

• 1 × Seal 91356-ZV5-000

Installation Notes

1. Disconnect the battery and remove the lower unit from the outboard motor following your service manual.
2. Disassemble the water pump housing, taking care to note the orientation of existing components.
3. Remove the old impeller seal and clean the sealing surfaces thoroughly to remove any residue or corrosion.
4. Lightly lubricate the new seal with marine-grade grease to aid installation and prevent tearing.
5. Install the new impeller seal into the housing, ensuring proper seating and orientation.
6. Reassemble the water pump components in the reverse order of disassembly, replacing the impeller if needed.
7. Reinstall the lower unit, reconnect the battery, and test the cooling system by running the engine in a test tank or on-water.
8. Inspect for leaks around the seal area and confirm steady water discharge from the telltale.

Troubleshooting & FAQ

How do I know if my water pump seal needs replacement?

Common signs include overheating, reduced or no water flow from the telltale indicator, visible coolant leaks around the lower unit, or unusual noise from the water pump during operation. If the seal is cracked, hardened, or missing, replacement is necessary.

Can I install this seal without replacing the entire water pump kit?

Yes, the seal can be replaced individually if the impeller and housing are still in good condition. However, it's recommended to inspect all water pump components during disassembly and replace worn parts together to avoid repeat maintenance.

Is this seal compatible with both saltwater and freshwater use?

Yes, this seal is suitable for marine environments including both saltwater and freshwater applications. Proper maintenance and regular flushing after saltwater use will extend seal life.

How often should I replace the water pump seal?

Replacement intervals vary based on usage, but it's generally recommended to inspect the seal annually or every 100–200 hours of operation. Replace immediately if any wear, cracking, or leakage is observed.

Will this aftermarket seal fit as precisely as the OEM part?

Yes, this seal is manufactured to OEM specifications and designed for direct fitment. Dimensions and materials match the original Honda part for reliable sealing performance.

What tools are needed for installation?

Basic hand tools including screwdrivers, socket set, and a lower unit removal tool are typically required. Consult your engine's service manual for specific torque specs and procedures.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.