Outdrive Mounting Gasket Set – Fits MerCruiser R, MR, and Alpha Gen I, II (Replaces 27-94996Q2)
Outdrive Mounting Gasket Set – Fits MerCruiser R, MR, and Alpha Gen I, II (Replaces 27-94996Q2) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Outdrive Mounting Gasket Set – Fits MerCruiser R, MR, and Alpha Gen...
Product Details
This Outdrive Mounting Gasket Set is designed for MerCruiser R, MR, and Alpha One/Gen I & II stern drives (1983 and newer, serial numbers 6225577 and higher). It ensures a precise, leak-free seal between the bell housing and the outdrive assembly.
It serves as a direct interchange for Mercury/MerCruiser 27-94996Q2/27-94996T2, Sierra 18-2619/18-2619-1, GLM 39622, EMP 27-02386, and Mallory 9-62601.
- Engineered as a direct-fit replacement for straightforward installation.
- Constructed from materials designed to withstand harsh marine saltwater environments.
- Formulated for high resistance to seawater corrosion and material degradation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 27-94996Q2 |
| Mercury/MerCruiser | 27-94996T2 |
| Sierra | 18-2619 |
| Sierra | 18-2619-1 |
| GLM | 39622 |
| EMP | 27-02386 |
| Mallory | 9-62601 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser sterndrives, this kit an exact fit for models from 1983 and newer with serial numbers 6225577 and higher.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | R Sterndrives | Various | 4-Stroke | 1983 and up | 27-94996Q2 | Serial numbers 6225577 and higher |
| MerCruiser | MR Sterndrives | Various | 4-Stroke | 1983 and up | 27-94996Q2 | Serial numbers 6225577 and higher |
| MerCruiser | Alpha One | Various | 4-Stroke | 1983 and up | 27-94996Q2 | Serial numbers 6225577 and higher |
| MerCruiser | Alpha One Gen II | Various | 4-Stroke | 1983 and up | 27-94996Q2 | Serial numbers 6225577 and higher |
Technical Specs
- Product Type
- Outdrive Installation Gasket Set
- Installation
- Direct replacement
- Connection
- Bell housing to outdrive
- Housing Material
- Rubber/paperboard composite
- Housing Color
- Black
- Fitting Type
- Direct fit
- Operating Temperature
- Marine saltwater environment
- Warranty
- Manufacturer dependent (typically 1 year)
- Other Technical Attributes
- Seawater corrosion resistant
What’s in the Box
-
1 x Complete 6-Piece Gasket & O-Ring Set (replaces 27-94996Q2), which includes:
- 1 x Gasket
- 5 x Rubber O-rings
Installation Notes
- Ensure the engine is off and the battery is disconnected. Place the drive in the full down/trim position.
- Remove the six nuts (and washers) that secure the outdrive to the bell housing.
- Carefully separate the outdrive from the bell housing. Be prepared to manage minor gear lube spillage.
- Thoroughly remove the old gasket and o-rings. Clean all mating surfaces, ensuring they are free of debris, corrosion, or old gasket material.
- Install the new gasket and o-rings onto the bell housing according to your service manual's diagram.
- Carefully guide the outdrive back into place, ensuring the driveshaft, shift shaft, and water tube align correctly.
- Reinstall the washers and nuts, tightening them to the manufacturer's specified torque sequence and value.
- Check and refill the sterndrive gear lube reservoir as needed.
- Reconnect the battery, start the engine, and check for any leaks or operational issues.
Troubleshooting & FAQ
Which MerCruiser models does this gasket set fit?
This gasket set fits MerCruiser R, MR, Alpha One, and Alpha One Gen II sterndrive models manufactured from 1983 and newer, specifically those with serial numbers 6225577 and higher. Always cross-reference your part number to be sure.
What are the signs of a failing outdrive gasket?
The most common sign is water intrusion into the gear lube, which makes the oil appear milky or creamy. Other indicators include visible gear lube leaking from the joint between the outdrive and the bell housing, or shifting problems caused by water damage.
How often should this gasket set be replaced?
It is best practice to replace the mounting gaskets and o-rings every time the outdrive is removed for service. As a preventative measure, especially in saltwater, replacing them every 1–2 seasons can prevent costly water intrusion damage.
Is this a complete kit for the job?
Yes, this kit includes the primary gasket and all necessary O-rings (6 pieces total) for sealing the main connection between the sterndrive unit and the bell housing.
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 vs 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.
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