Manifold Cover Gasket – Fits Mercury/Mercruiser 80-125 HP 4-Cylinder Outboards (Replaces 27-134612)
Manifold Cover Gasket – Fits Mercury/Mercruiser 80-125 HP 4-Cylinder Outboards (Replaces 27-134612) 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
Free standard shipping on all orders under 1 KG
Manifold Cover Gasket – Fits Mercury/Mercruiser 80-125 HP 4-Cylinde...
Product Details
This high-quality Manifold Cover Gasket ensures a perfect seal for the manifold components on Mercury/Mariner 80–125 HP 4-cylinder outboard engines. It is designed for a precise fit on a wide range of models, primarily from the 1980s through the early 2000s.
This gasket is a direct aftermarket replacement for Mercury part numbers 27-134612 and 27-13461, and also interchanges with Sierra 18-2942.
- Designed for direct, hassle-free installation.
- Crafted from durable gasket material to withstand the marine environment.
- Package includes one manifold cover gasket; check your service manual as some engines require two.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 27-134612 |
| Mercury | 27-13461 |
| Sierra | 18-2942 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits the following Mercury and Mariner 4-cylinder outboard engines. Please verify your engine's serial number range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 9793577–0P016999 | 27-134612 | |
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 0D283222–0G760299 | 27-134612 | |
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 0G760300–0T979999 | 27-134612 | |
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 0P017000–0P325499 | 27-134612 | |
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 0T980000–0T999999 | 27-134612 | |
| Mercury/Mariner | 80 JET | 80 | 4-Stroke | 1B000001 & Up | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 9523034–9793576 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 0A722297–0D283221 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 0B209468–0D283221 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 0D283222–0G760299 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 0G760300–0G965520 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 9793577–0P016999 | 27-134612 | |
| Mercury/Mariner | 100 (4 CYL.) | 100 | 4-Stroke | 0P017000–0P058999 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 9559771–9793576 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0C100000–0D283221 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0D283222–0G760299 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0G760300–0T979999 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 9793577–0P016999 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0P017000–0P325499 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0P325500 & Up | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 0T980000–0T999999 | 27-134612 | |
| Mercury/Mariner | 115 (4 CYL.) | 115 | 4-Stroke | 1B000001 & Up | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 0D283222–0G760299 | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 0G760300–0T979999 | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 9793577–0P016999 | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 0P017000–0P325499 | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 0P325500 & Up | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 0T980000–0T999999 | 27-134612 | |
| Mercury/Mariner | 125 (4 CYL.) | 125 | 4-Stroke | 1B000001 & Up | 27-134612 |
Technical Specs
- Product Type
- Manifold Cover Gasket
- Installation
- Direct replacement
- Material
- Gasket material (paper/composite)
- Dimensions
- 24.5" L x 14.0" W x 0.4" H
- Weight
- Approximately 0.02 lbs (0.009 kg)
- Application
- Used with manifold components on Mercury 4-cylinder outboard engines
What’s in the Box
- 1 x Manifold Cover Gasket (Replaces OEM 27-134612)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the power source.
- Carefully remove the existing manifold cover and old gasket material.
- Thoroughly clean both the engine block and manifold cover surfaces, ensuring they are free of debris, oil, and old gasket residue.
- Position the new gasket correctly on the engine block.
- Reinstall the manifold cover and tighten bolts to the manufacturer's specified torque settings and sequence.
- Check your engine's service manual, as some models may require two gaskets.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket fits a specific range of Mercury/Mariner 80–125 HP 4-cylinder outboards. The most reliable way to confirm is by matching your engine's serial number to the ranges listed in the compatibility table.
How many gaskets do I need for my engine?
This package contains one gasket. While many applications require only one, some specific engine models require two gaskets per engine. Please consult your service manual to confirm the quantity needed for your particular setup.
What are the signs of a failing manifold cover gasket?
Common symptoms include visible water or exhaust leaks around the manifold cover, engine overheating, poor performance, or an unusual change in engine sound.
What are the exact dimensions of this gasket?
The overall product dimensions are approximately 24.5" L x 14.0" W x 0.4" H. However, it's more important to verify fitment using the engine model and serial number compatibility chart than to rely on measurements alone.
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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