26-830749 Gearcase Drain Plug Gaskets, 6-Pack, Replaces 8M0204693, for Mercury/Mariner Outboards and MerCruiser Stern Drives
26-830749 Gearcase Drain Plug Gaskets, 6-Pack, Replaces 8M0204693, for Mercury/Mariner Outboards and MerCruiser Stern Drives is backordered and will ship as soon as it is back in stock.
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26-830749 Gearcase Drain Plug Gaskets, 6-Pack, Replaces 8M0204693, ...
26-830749 Gearcase Drain Plug Gaskets, 6-Pack, Replaces 8M0204693, for Mercury/Mariner Outboards and MerCruiser Stern Drives is backordered and will ship as soon as it is back in stock.
Product Details
These gearcase drain plug gaskets are replacement sealing washers for lower-unit gear lube drain and fill screws. They help renew the seal between the screw and gearcase housing during routine gear oil service.
The gaskets are listed for selected Mercury and Mariner outboards, including applications such as the Mercury 115FS and 150 EFI four-stroke models, as well as MerCruiser stern drives that use the matching drain or fill screw and sealing washer.
- Replacement reference: Mercury OEM part number 26-830749.
- Also listed as replacing or corresponding to 8M0204693.
- Suitable for use when replacing a removed or compressed drain-plug gasket.
- Package quantity: 6 gaskets.
Part Number Matrix
Use the following references to compare the required drain screw gasket before ordering.
| Brand | Part Number | Reference |
|---|---|---|
| Mercury | 26-830749 | Primary OEM reference |
| Mercury | 8M0204693 | Replacement or current reference listed for comparison |
Engine & Model Compatibility
Compatibility depends on the drain or fill screw and sealing surface used by the specific lower unit. Confirm the part number, gasket dimensions, and screw configuration against the original part before installation.
| Brand | Model or Application | Rated HP | Stroke | OEM Reference | Notes |
|---|---|---|---|---|---|
| Mercury | 115FS | 115 | Four-stroke | 26-830749 | Verify the installed drain/fill screw and sealing surface. |
| Mercury | 150 EFI | 150 | Four-stroke | 26-830749 | Verify the installed drain/fill screw and sealing surface. |
| Mariner | Selected outboard applications | Varies | Varies | 26-830749 | Confirm the original gasket and lower-unit configuration. |
| MerCruiser | Selected stern drives | Varies | Not applicable | 26-830749 | Use only where the matching drain or fill screw requires this gasket. |
Technical Specs
- Product Type
- Gearcase drain plug gasket / sealing washer
- Package Quantity
- 6 pieces
- Primary OEM Reference
- 26-830749
- Additional Reference
- 8M0204693
- Installation Location
- Between the gearcase drain or fill screw and the lower-unit housing
- Application
- Selected Mercury and Mariner outboards and MerCruiser stern drives
What’s in the Box
- 6 x Gearcase drain plug seal gaskets
Installation Notes
- Place a suitable drain pan beneath the lower-unit gearcase.
- Remove the gearcase drain or fill screw according to the engine or drive manufacturer’s service procedure.
- Remove and discard the old gasket.
- Clean the screw and the sealing surface on the gearcase. Do not install a new gasket over dirt, sealant, or a damaged surface.
- Install one new gasket on the screw.
- Reinstall the screw and tighten it to the manufacturer-specified torque. Avoid overtightening, which can damage the gasket, screw, or housing.
- After service, check the area for leaks and confirm that the gearcase contains the correct lubricant level.
Troubleshooting & FAQ
How do I know whether this gasket fits my engine?
Compare the original gasket and OEM reference with this listing, then verify the drain or fill screw and sealing surface on your exact lower unit. Model names alone are not sufficient because applications can vary by year, serial range, and gearcase configuration.
What is the difference between 26-830749 and 8M0204693?
Both numbers are listed as references for this drain screw gasket application. Use the number shown in your service information or on the original part when confirming compatibility.
How often should I replace the drain gasket?
Replacing the gasket whenever the drain or fill screw is removed is recommended. A fresh gasket helps restore the sealing surface and reduce the chance of gear oil leakage or water entry.
What are common signs of a worn gasket?
Possible signs include oil seepage around the drain or fill screw, a flattened or damaged gasket, or visible cracking and deformation after removal.
Can I reuse the old gasket?
Reuse is not recommended. The gasket may have compressed during its first installation and may not seal reliably when reinstalled.
Is this an OEM Mercury part?
This listing is for a replacement gasket identified by the OEM reference numbers above. It is not presented as a genuine Mercury-branded component.
Safety & Important Information
- Verify the OEM reference, gasket shape, dimensions, and screw configuration before ordering.
- Do not use this gasket if the gearcase sealing surface or drain screw is damaged.
- Follow the manufacturer’s service procedure and torque specification for your exact engine or stern drive.
- Professional installation is recommended when you are not familiar with gearcase service.
About Sea Sierra
- Marine Maintenance Parts — Practical replacement components for routine outboard and stern-drive service.
- Application-Focused Listings — Reference numbers and fitment information are provided to help you compare the original part.
- Service-Ready Selection — Keep replacement sealing components available for scheduled gearcase maintenance.
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