Water Pump Oil Seal 2-Pack for Yamaha 115–300 HP Outboards – Replaces 93101-28M16-00
Water Pump Oil Seal 2-Pack for Yamaha 115–300 HP Outboards – Replaces 93101-28M16-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Oil Seal 2-Pack for Yamaha 115–300 HP Outboards – Replaces 93101-28M16-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Oil Seal 2-Pack is intended for selected Yamaha outboard water-pump applications in the 115 HP to 300 HP range. The seals help maintain the integrity of the water-pump and driveshaft sealing area, helping prevent water intrusion and lubricant leakage when correctly matched to the engine’s parts diagram.
The seals are listed as a replacement for Yamaha OEM part 93101-28M16-00. They are also commonly referenced with Sierra 18-0265, Mallory 9-76412, and Mallory 9-76421. Confirm the part number, dimensions, engine model, year, serial range, and installation orientation before ordering.
- Two water-pump oil seals are included.
- Designed for applications in which two seals are installed together.
- S-type oil-seal design for marine water-pump service.
- Aftermarket replacement component; not manufactured by Yamaha.
Part Number References
Use the following references as identification leads only. Always verify the applicable OEM number against your engine’s service manual or parts diagram.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 93101-28M16-00 | OEM replacement reference |
| Yamaha | 93101-28018 | Earlier reference listed with this application |
| Yamaha | 93101-028019 | Earlier reference listed with this application |
| Sierra | 18-0265 | Aftermarket reference |
| Mallory | 9-76412 | Aftermarket reference |
| Mallory | 9-76421 | Aftermarket reference |
Engine Application Guidance
This seal set is associated with selected Yamaha V4 and V6 outboards, including certain 2-stroke and 4-stroke models rated from approximately 115 HP through 300 HP. Application coverage can vary by model, year, shaft configuration, and serial-number range, so the horsepower range alone is not sufficient to confirm fitment.
Before purchase, compare the OEM reference and the seal dimensions with the parts diagram for your exact Yamaha engine. Do not rely solely on the model family or rated horsepower.
| Application group | Rated horsepower | Stroke | Fitment condition |
|---|---|---|---|
| Selected Yamaha V4/V6 outboards | 115–130 HP | 2-stroke | Verify exact model, year, and serial range |
| Selected Yamaha V4/V6 outboards | 150–175 HP | 2-stroke | Verify exact model, year, and serial range |
| Selected Yamaha V4/V6 outboards | 200–225 HP | 2-stroke | Verify exact model, year, and serial range |
| Selected Yamaha V4/V6 outboards | 250–300 HP | 2-stroke | Verify exact model, year, and serial range |
| Selected Yamaha outboards | 115–300 HP | 4-stroke applications may vary | Confirm the exact OEM part number before ordering |
Technical Specifications
- Product type
- Water pump oil seal
- Package quantity
- 2 seals
- Installation arrangement
- Stacked pair where specified by the engine design
- Inside diameter
- 27 mm
- Outside diameter
- 43.25 mm
- Width
- 7 mm per seal
- Seal type
- S-type oil seal for water-pump applications
- Color
- Black
- Material
- Rubber sealing material
What’s in the Box
- 2 × Water Pump Oil Seals
Installation Notes
- Disconnect the battery and secure the boat according to the manufacturer’s service procedures.
- Remove the lower unit and disassemble the water-pump components as directed by the service manual.
- Remove the old seals carefully and note their orientation and installed depth before removal.
- Clean the seal bore and surrounding area, removing corrosion, old lubricant, and debris.
- Press the first seal into position using a suitable seal driver that applies even pressure.
- Where the engine design calls for two seals, install the second seal in the specified orientation and depth. Do not assume that the two seals should be installed back-to-back without checking the service manual.
- Lubricate the seal lips and driveshaft as specified by the manufacturer, then reassemble the water pump and lower unit.
- Check for leaks and verify proper operation after installation.
Troubleshooting & FAQ
How do I confirm that these seals fit my engine?
Check the OEM part number in your Yamaha parts diagram or service manual and compare it with 93101-28M16-00 and the other listed references. Also confirm the exact model, year, shaft configuration, and serial-number range. The 115–300 HP range by itself does not confirm fitment.
Why are two seals included?
This listing contains two seals for water-pump applications that use a stacked pair. The correct orientation, spacing, and installation depth depend on the engine design. Follow the applicable Yamaha service information rather than assuming a universal orientation.
What are common signs of a failed water-pump oil seal?
Possible signs include water contamination in the gear lubricant, milky or cloudy gear oil, or oil and water leakage around the lower-unit sealing area. Inspect the complete water-pump and lower-unit assembly before replacing individual parts.
Should these seals be replaced during water-pump service?
Replacement may be appropriate when the seals show wear, damage, leakage, corrosion, or when the service procedure requires their removal. Inspect the seal bore, shaft surfaces, and related water-pump components at the same time.
Is this an original Yamaha OEM part?
No. This listing is for an aftermarket replacement seal set. Yamaha and the other brands named in the reference table are used only to identify compatible part-number references and are not claims that this product is manufactured by those brands.
What should I do if my model appears to be in the horsepower range but the part looks different?
Do not install the part based only on horsepower. Compare the original seal, dimensions, OEM number, and parts-diagram position. If any of these details differ, obtain confirmation from the engine manufacturer’s documentation or a qualified marine technician.
Safety & Important Information
- Confirm the exact OEM part number, model, year, and serial range before ordering.
- Compare dimensions and installation orientation with the original part and service manual.
- This is an aftermarket replacement and is not an original Yamaha component.
- Incorrect seal selection or installation can allow water intrusion, lubricant leakage, or engine and gearcase damage.
- Professional installation is recommended when lower-unit or water-pump service is outside your experience.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Part-number and application references are provided to help customers compare parts before ordering.
- Support for Maintenance Projects — Always use the engine manufacturer’s service information for final fitment and installation requirements.
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