Honda Water Pump O-Ring 42.2 × 2.4 mm – Replaces 91301-ZG3-000
Honda Water Pump O-Ring 42.2 × 2.4 mm – Replaces 91301-ZG3-000 is backordered and will ship as soon as it is back in stock.
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Honda Water Pump O-Ring 42.2 × 2.4 mm – Replaces 91301-ZG3-000
Honda Water Pump O-Ring 42.2 × 2.4 mm – Replaces 91301-ZG3-000 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Honda water pump O-ring is a single sealing ring for the water pump and vertical-shaft assembly on select Honda four-stroke outboard engines. The ring measures approximately 42.2 × 2.4 mm and replaces Honda reference number 91301-ZG3-000.
The O-ring helps seal the water pump assembly and maintain the separation between the cooling-water passages and surrounding components. Replace it when servicing the water pump, or whenever the existing seal is flattened, hardened, cracked, damaged, or no longer seats correctly.
- Single water pump O-ring
- Approximate size: 42.2 × 2.4 mm
- Replacement reference: Honda 91301-ZG3-000
- For select Honda four-stroke outboard water pump assemblies
- Not a complete water pump, impeller, gasket, or maintenance kit
Part Number Matrix
Use the reference below to compare the replacement with your service manual or original part before ordering.
| Brand | Manufacturer Reference | Part Description |
|---|---|---|
| Honda | 91301-ZG3-000 | Water pump O-ring, approximately 42.2 × 2.4 mm |
Engine & Model Compatibility
Catalog references associate Honda 91301-ZG3-000 with the water pump or vertical-shaft assemblies listed below. Model, year, shaft configuration, and serial-number conditions can vary by catalog and engine version, so confirm the part number in the applicable Honda parts diagram before installation.
| Brand | Model Family | Rated HP | Stroke | Assembly Reference | Part Number |
|---|---|---|---|---|---|
| Honda | BFP8 | 8 | 4-Stroke | Water pump / vertical shaft | 91301-ZG3-000 |
| Honda | BFP9 | 9 | 4-Stroke | Water pump / vertical shaft | 91301-ZG3-000 |
| Honda | BFP15 | 15 | 4-Stroke | Water pump impeller kit or vertical shaft | 91301-ZG3-000 |
| Honda | BF20 | 20 | 4-Stroke | Water pump impeller kit or vertical shaft | 91301-ZG3-000 |
| Honda | BFP20 | 20 | 4-Stroke | Water pump impeller kit or vertical shaft | 91301-ZG3-000 |
Technical Specifications
- Part Type
- Water pump O-ring
- Approximate Dimensions
- 42.2 × 2.4 mm
- Manufacturer Reference
- Honda 91301-ZG3-000
- Application
- Select Honda four-stroke outboard water pump and vertical-shaft assemblies
- Quantity
- One O-ring
What's in the Box
- 1 × Water pump O-ring
Installation Notes
- Stop the engine, disconnect the fuel supply as appropriate, and remove the engine cowling.
- Follow the service manual procedure for removing the lower unit and accessing the water pump.
- Remove the water pump housing and take out the old O-ring without damaging the sealing groove.
- Inspect the housing, mating surfaces, impeller, key, and surrounding components for wear, scoring, corrosion, or debris.
- Clean the sealing groove and mating surfaces before installation.
- Apply a light film of suitable marine grease or assembly lubricant if permitted by the engine service manual.
- Install the new O-ring evenly in its groove. Do not twist, pinch, stretch, or cut the seal.
- Reassemble the water pump and lower unit using the correct service-manual procedures and fastener specifications.
- Run the engine in a suitable test tank or with the correct flushing equipment and check for proper cooling-water flow and leaks.
Troubleshooting & FAQ
What does this product replace?
This replacement O-ring is intended to replace Honda reference number 91301-ZG3-000. Confirm the number and approximate dimensions against your engine parts diagram before ordering.
Is this a complete water pump kit?
No. This listing is for one O-ring only. It does not include an impeller, impeller key, water-pump gasket, housing, or other maintenance-kit components.
Which Honda engines use this O-ring?
Catalog references associate this part number with select four-stroke Honda BFP8, BFP9, BFP15, BF20, and BFP20 water pump or vertical-shaft assemblies. Exact fitment may depend on model year, shaft configuration, and serial-number range.
Can I reuse the old O-ring?
Replacement is recommended whenever the water pump is serviced if the existing O-ring is flattened, hardened, cracked, cut, or damaged. A used seal may not reseat reliably after disassembly.
What can happen if the O-ring is installed incorrectly?
A twisted, pinched, dry, or incorrectly sized O-ring can leak or become damaged during assembly. A water-pump seal leak can reduce cooling-system performance and may contribute to overheating.
How do I confirm fitment?
Compare the reference number, dimensions, engine model, year, shaft configuration, and serial-number range with your Honda service manual or parts diagram. If your diagram specifies 91301-ZG3-000, this replacement is the applicable reference.
Does the package include an impeller or key?
No. The package contains one O-ring only. An impeller, impeller key, gasket, and other water-pump parts must be purchased separately unless specifically included in another listing.
Safety & Important Information
- Verify the reference number and dimensions before purchase.
- Keep model, year, shaft, and serial-number conditions together when checking fitment.
- Use the engine manufacturer's service manual for removal, installation, torque, lubrication, and testing procedures.
- Do not operate an outboard with inadequate cooling-water flow or a suspected water-pump leak.
- This listing is for a replacement part and is not a complete Honda water pump assembly or maintenance kit.
- Professional installation is recommended if you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Product references and application information are provided to help you compare the part with your engine diagram.
- Maintenance Support — Replace worn sealing components during appropriate water-pump service to help protect cooling-system performance.
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