Gasket – Fits Mercury/Mariner 30-60 HP 3-Cylinder Outboards (Replaces 27-812869)
Gasket – Fits Mercury/Mariner 30-60 HP 3-Cylinder Outboards (Replaces 27-812869) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gasket – Fits Mercury/Mariner 30-60 HP 3-Cylinder Outboards (Replac...
Product Details
This Gasket – Fits Mercury/Mariner 30-60 HP 3-Cylinder Outboards is an essential component for maintaining a proper seal on the induction manifold. It is designed for various 3-cylinder, 2-stroke outboard motors from series 9973100 through current production models, ensuring broad compatibility for repairs and maintenance.
This part is a direct aftermarket replacement, providing a reliable cross-reference for Mercury OEM part numbers 27-812869 and 812869.
- Engineered as a direct OEM factory replacement for a precise fit.
- Specifically designed for induction manifold applications.
- Constructed from durable, high-quality gasket material to ensure a lasting seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 27-812869 |
| Mercury | 812869 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for a wide range of Mercury and Mariner 3-cylinder outboards. Please verify your specific model and serial number range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 9973100–0P016999 | 27-812869 | |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 0G590000–0G760299 | 27-812869 | |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 0G760300–0T408999 | 27-812869 | |
| Mercury | 30 JET (3 CYL.) | 30 | 2-Stroke | 0P017000–0P153499 | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 9973100–0P016999 | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 0G590000–0G760299 | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 0G760300–0T979999 | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 0P017000–0P325499 | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 0P325500 & Up | 27-812869 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | 0T980000–1B209735 | 27-812869 | |
| Mercury | 40 JET | 40 | 2-Stroke | 0P094500–0P325499 | 27-812869 | |
| Mercury | 40 JET | 40 | 2-Stroke | 0T178500–0T979999 | 27-812869 | |
| Mercury | 40 JET | 40 | 2-Stroke | 0P325500 & Up | 27-812869 | |
| Mercury | 40 JET | 40 | 2-Stroke | 0T980000 & Up | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 9683055–9885344 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 9885385–9973099 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 9973100–0P016999 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 0G590000–0G760299 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 0G760300–0T129554 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 0P017000–0P094499 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 0D000750–0G290584 | 27-812869 | |
| Mercury | 45 JET | 45 | 2-Stroke | 0G290585–0G589999 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 9683055–9885344 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 9885345–9973099 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 9973100–0P016999 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0G590000–0G760299 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0G760300–0T979999 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0P017000–0P325499 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0P325500 & Up | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0T980000 & Up | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 1B000001 & Up | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0D000750–0G290584 | 27-812869 | |
| Mercury | 50 (3 CYL.) | 50 | 2-Stroke | 0G290585–0G589999 | 27-812869 | |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 9741042–9885344 | 27-812869 | |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 9885345–9973099 | 27-812869 | |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 9973100–0P016999 | 27-812869 | |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 0G590000–0G760299 | 27-812869 | |
| Mercury | 55 (3 CYL.) | 55 | 2-Stroke | 0G760300–0T979999 | 27-812869 | |
| Mercury | 60 (3 CYL.) BIGFOOT | 60 | 2-Stroke | 0P017000–0P325499 | 27-812869 |
Technical Specs
- Product Type
- Induction Manifold Gasket
- Installation
- OEM Factory Replacement
- Housing Material
- Gasket Material
- Dimensions
- 29.5 × 13.5 × 0.1 cm (approx. 11.6 × 5.3 × 0.04 inches)
- Weight
- 0.03 lbs (0.014 kg)
- GTIN
- 745061307032
What’s in the Box
- 1 x Gasket (Replaces 27-812869)
Installation Notes
- Ensure the engine is cool and disconnect the battery for safety.
- Relieve any pressure from the fuel system according to the manufacturer's guidelines.
- Remove the engine cowling to access the manifold.
- Carefully label and disconnect any fuel lines, hoses, or electrical connectors attached to the induction manifold.
- Systematically unbolt and remove the induction manifold from the engine block.
- Remove the old gasket. Thoroughly clean both mating surfaces, ensuring they are completely free of old gasket material, sealant, and any oil or debris.
- Position the new gasket correctly on the engine block. Do not use sealant unless explicitly required by your engine's service manual.
- Reinstall the induction manifold. Tighten the bolts in the sequence and to the torque specifications recommended by the manufacturer to ensure an even seal.
- Reconnect all hoses, lines, and electrical connectors.
- Reconnect the battery, start the engine, and carefully inspect for any air or fuel leaks around the manifold area.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
This gasket is designed for Mercury/Mariner 30-60 HP 3-cylinder 2-stroke outboards. To confirm a perfect match, please check your engine's model, horsepower, and serial number range against the compatibility table on this page.
What are the signs of a failing induction manifold gasket?
Common symptoms include a rough or unstable idle, difficulty starting, reduced engine power, an audible vacuum leak (hissing sound) near the manifold, and potentially a "check engine" light if your model has one. These issues are caused by an improper air-fuel mixture from the leak.
Can I reuse my old gasket?
No. Gaskets are designed for single use. They compress and conform to mating surfaces to create a seal. Reusing an old gasket will almost certainly result in leaks, leading to poor engine performance and potential damage.
Is sealant required for this gasket installation?
In most cases, this gasket is designed to be installed dry on clean, prepared surfaces. Applying sealant can cause the gasket to slip or be squeezed out, leading to a failed seal. Always consult your official service manual for your specific engine model's requirements.
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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