Water Pump Housing O-Ring for Yamaha Outboard – Replaces 93210-45161, Sierra 18-71332

Product Details

This water pump housing O-ring is an aftermarket replacement seal for Yamaha marine outboard water pump assemblies. It is intended to seal the water pump housing and help prevent coolant-water leakage when the original O-ring is worn, flattened, cracked, or damaged.

The primary Yamaha OEM reference is 93210-45161. The part is also listed as the Sierra aftermarket equivalent 18-71332. Confirm the OEM reference and the physical dimensions against your service manual or original seal before ordering.

• Replacement O-ring for the water pump housing
• Designed for use in Yamaha marine outboard water pump applications using OEM reference 93210-45161
• Helps restore the sealing interface during water pump service
• Single replacement seal; water pump housing, impeller, gasket, and other components are not included

Part Number Matrix

Use the following references to compare the replacement part with your original component.

Engine & Model Compatibility

This replacement is associated with Yamaha marine outboard water pump applications that use OEM reference 93210-45161. A complete model-by-model, year, horsepower, stroke, shaft-length, and serial-number fitment range was not established in the available records. Verify the exact reference in your engine parts diagram or service manual before purchase.

Technical Specs

Part Type

Water pump housing O-ring

Application

Marine outboard water pump assembly

Brand Application

Yamaha

OEM Reference

93210-45161

Aftermarket Reference

Sierra 18-71332

Product Type

Single replacement component, not a kit

What's in the Box

• 1 × Water pump housing O-ring

Installation Notes

1. Review the service manual for your exact Yamaha outboard and follow all safety procedures before beginning work.
2. Remove the lower unit and water pump housing according to the applicable service procedure.
3. Remove the old O-ring and clean the sealing groove and mating surfaces thoroughly.
4. Inspect the housing and groove for corrosion, damage, debris, or distortion. Correct any underlying condition before assembly.
5. Apply only the lubricant specified by the engine manufacturer or service manual, if lubrication is required.
6. Install the new O-ring evenly in the groove without twisting, pinching, or stretching it.
7. Reassemble the water pump housing and lower unit using the service-manual torque specifications.
8. After installation, verify proper cooling-water flow and check the water pump area for leakage.

Troubleshooting & FAQ

What does this O-ring seal?

This O-ring seals the water pump housing interface in the water pump assembly. Its exact position should be confirmed using the service manual or parts diagram for your engine.

When should the O-ring be replaced?

Replace it whenever it is cracked, flattened, hardened, damaged, contaminated, or disturbed during water pump service. Follow the maintenance schedule and inspection instructions for your specific engine.

Can I reuse the old O-ring?

Reusing an O-ring that has been compressed, aged, or removed can increase the risk of leakage. Install a new seal during water pump service unless the manufacturer specifically permits reuse.

What lubricant should I use?

Use only the lubricant specified by the engine manufacturer or service manual. If no lubricant is specified, do not apply an unapproved product that could damage the seal or affect assembly.

Will this fit my specific Yamaha outboard?

This part is associated with Yamaha OEM reference 93210-45161. Yamaha fitment varies by model, year, configuration, and serial-number range, so verify that reference in your engine parts diagram or service manual before ordering.

Does this include the water pump housing or impeller?

No. This listing is for one replacement O-ring only. The water pump housing, impeller, cover gasket, key, and other water pump components are not included.

Is this an OEM Yamaha part?

No. This is an aftermarket replacement for the Yamaha OEM reference listed above.

Safety & Important Info

• Verify the OEM reference, engine model, serial-number range, and physical dimensions before purchase.
• Do not rely on brand or general Yamaha compatibility alone to confirm fitment.
• Use the service manual for lower-unit removal, installation procedures, and torque specifications.
• After servicing the water pump, confirm adequate cooling-water flow before operating the engine normally.
• This is an aftermarket replacement component, not an OEM Yamaha component.

About Sea Sierra

• Marine replacement parts selected for practical repair and maintenance applications.
• Clear part-number references to help customers compare replacement components with their original parts.
• Support for marine parts identification and fitment verification before ordering.