Reed Plate Gasket – Fits Mercury 45-50 HP Outboards (Replaces 27-854913)
Reed Plate Gasket – Fits Mercury 45-50 HP Outboards (Replaces 27-854913) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Reed Plate Gasket – Fits Mercury 45-50 HP Outboards (Replaces 27-85...
Product Details
This aftermarket Reed Plate Gasket is designed for Mercury 45 HP and 50 HP 2-stroke outboard engines manufactured between 1975 and 1989. It ensures a precise seal between the cylinder block and the baffle plate, which is critical for maintaining engine compression and performance.
It serves as a direct replacement for Mercury OEM part numbers 27-46110, 27-72486, 27-85491, 27-854911, 27-854912, 27-854913, and Quicksilver 27-854913.
- Installation Location: Mounts between the cylinder block and baffle plate.
- Engine Compatibility: Fits various 2-stroke Mercury and Mariner outboards.
- Construction: Engineered for a reliable, leak-free seal in marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 27-854913 | Current primary replacement part number. |
| Quicksilver | 27-854913 | Interchangeable with Mercury 27-854913. |
| Mercury | 27-46110 | Superseded by 27-854913. |
| Mercury | 27-72486 | Superseded by 27-854913. |
| Mercury | 27-85491 | Superseded by 27-854913. |
| Mercury | 27-854911 | Superseded by 27-854913. |
| Mercury | 27-854912 | Superseded by 27-854913. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 45 HP | 45 | 2-Stroke | 1975–1989 | 27-854913 | Supersedes: 27-46110, 27-72486, 27-85491, 27-854911, 27-854912 |
| Mercury | 50 HP | 50 | 2-Stroke | 1975–1989 | 27-854913 | Supersedes: 27-46110, 27-72486, 27-85491, 27-854911, 27-854912 |
| Mercury | 40 (4 CYL.) | 40 | 2-Stroke | 0C159200 and up | 27-854913 | |
| Mercury | 30 JET | 30 | 2-Stroke | 9570790 and up | 27-854913 | |
| Mercury | 40 JET | 40 | 2-Stroke | 0C159200–0G589999 | 27-854913 |
Technical Specs
- Product Type
- Reed Plate Gasket
- Installation
- Cylinder Block to Baffle Plate
- Application
- Mercury Outboard Engine
- Dimensions
- 17.13″ H × 14.0″ W × 0.13″ L
- Weight
- 0.05 lbs (0.023 kg)
What’s in the Box
- 1 x Gasket (27-854913)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the power source before starting.
- Remove the engine cowling and any other components obstructing access to the reed block.
- Carefully detach the reed block assembly from the engine's cylinder block. Note the orientation and order of components.
- Remove the old, worn gasket. Thoroughly clean both mating surfaces, ensuring they are free of any old gasket material, oil, or debris.
- Align the new gasket correctly onto the cylinder block. Check that all bolt holes and passages line up perfectly.
- Reinstall the reed block assembly onto the new gasket.
- Tighten the fasteners in the sequence and to the torque values specified in your engine's service manual to ensure an even seal.
- Reassemble all previously removed parts, reconnect the battery, and test the engine for leaks and proper operation.
Troubleshooting & FAQ
How do I know if this gasket fits my specific engine model?
The "Engine & Model Compatibility" table lists all confirmed models, years, and applicable serial number ranges. The most reliable method is to cross-reference the OEM part number (27-854913) with the number specified in your engine's service manual or parts diagram.
What are the signs of a failed reed plate gasket?
Common symptoms of a bad reed plate gasket include poor or rough idling, difficulty starting, a noticeable loss of power, engine backfiring, or fuel spitting back through the carburetor. A physical inspection might reveal cracks or deterioration in the old gasket.
Should I use any sealant or adhesive with this gasket?
This gasket is designed to be installed dry. Applying sealants can interfere with the function of the reed valves or block critical fuel and air passages. Always follow the recommendations in your official service manual, but dry installation is standard practice.
What is the difference between this aftermarket part and an OEM part?
This listing is an aftermarket replacement, not an OEM component. It has been engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, material quality, and performance. Our parts are produced in an ISO 9002 certified facility and undergo batch inspections to ensure consistency and reliability.
How much is shipping and how fast will I get it?
We ship worldwide, with most orders arriving in 5–15 business days. Standard shipping is free to most regions. Expedited shipping options and exact costs are available and calculated at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. Should you encounter an issue, please contact our support team with your order details. Returns of unused parts in their original condition are accepted within our standard return window. Please see our policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against 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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