Cylinder Gasket – Fits Yamaha/Mercury 9.9–15HP 2-Stroke (Replaces 682-11351-A0-00)
Cylinder Gasket – Fits Yamaha/Mercury 9.9–15HP 2-Stroke (Replaces 682-11351-A0-00) is backordered and will ship as soon as it is back in stock.
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Cylinder Gasket – Fits Yamaha/Mercury 9.9–15HP 2-Stroke (Replaces 6...
Product Details
This aftermarket Cylinder Gasket provides a reliable seal between the cylinder and crankcase for select Yamaha and Mercury/Mariner 2-stroke outboard engines. It is designed for twin-cylinder 9.9HP and 15HP models manufactured between 1979 and 1995, ensuring a precise, direct-fit replacement for listed part numbers.
This part replaces Yamaha part numbers 682-11351-A0-00, 682-11351-02-00, 682-11351-01-00, and 682-11351-00, as well as Mercury/Mariner 27-96602/27-96602M and Sierra 18-99095.
- Engineered for marine outboard applications.
- Installs as a direct replacement for the original part.
- Seals the cylinder to the crankcase to prevent compression and coolant leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00, 682-11351-00 |
| Mercury/Mariner | 27-96602 | Also referenced as 27-96602M, 96602 |
| Sierra | 18-99095 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of Yamaha 9.9HP and 15HP 2-stroke outboards from 1984–1995.
It also fits specific Mercury/Mariner 9.9HP and 15HP 2-stroke models, including C, K, and W series, from 1979–1986.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9ELD | 9.9 | 2-Stroke | 1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELF | 9.9 | 2-Stroke | 1989 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELG | 9.9 | 2-Stroke | 1988 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELH | 9.9 | 2-Stroke | 1987 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELHP | 9.9 | 2-Stroke | 1991 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELHQ | 9.9 | 2-Stroke | 1992 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELHR | 9.9 | 2-Stroke | 1993 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELHS | 9.9 | 2-Stroke | 1994 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELHT | 9.9 | 2-Stroke | 1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELJ | 9.9 | 2-Stroke | 1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELK | 9.9 | 2-Stroke | 1985 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ELN | 9.9 | 2-Stroke | 1984 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ESD/9.9ESF/9.9ESG/9.9ESH | 9.9 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ESHP/9.9ESHQ/9.9ESHR/9.9ESHS/9.9ESHT | 9.9 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9ESJ/9.9ESK/9.9ESN | 9.9 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9LD/9.9LF/9.9LG/9.9LH | 9.9 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9LJ/9.9LK/9.9LN | 9.9 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9MLHP-T (P-T suffixes) | 9.9 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9MSHP-T (P-T suffixes) | 9.9 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9SD/9.9SF/9.9SG/9.9SH | 9.9 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 9.9SJ/9.9SK/9.9SN | 9.9 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ELD/15ELF/15ELG/15ELH | 15 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ELHP/15ELHQ/15ELHR/15ELHS/15ELHT | 15 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ELJ/15ELN | 15 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ESD/15ESF/15ESG/15ESH | 15 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ESHP/15ESHQ/15ESHR/15ESHS/15ESHT | 15 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15ESJ/15ESK/15ESN | 15 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15LD/15LF/15LG/15LH | 15 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15LJ/15LK/15LN | 15 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15MLHP-T (P-T suffixes) | 15 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15MSHP-T (P-T suffixes) | 15 | 2-Stroke | 1991–1995 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15SD/15SF/15SG/15SH | 15 | 2-Stroke | 1987–1990 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Yamaha | 15SJ/15SK/15SN | 15 | 2-Stroke | 1984–1986 | 682-11351-A0-00 | Supersedes 682-11351-02-00, 682-11351-01-00 |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 9.9C | 9.9 | 2-Stroke | 1979–1986 | 27-96602 | Also 27-96602M, 96602 |
| Mercury | 15C | 15 | 2-Stroke | 1979–1986 | 27-96602 | Also 27-96602M, 96602 |
| Mercury | 15K | 15 | 2-Stroke | 1979–1986 | 27-96602 | Also 27-96602M, 96602 |
| Mercury | W15 | 15 | 2-Stroke | 1979–1986 | 27-96602 | Also 27-96602M, 96602 |
Technical Specs
- Product Type
- Cylinder Gasket
- Installation
- Direct replacement
- Material
- Composite material
- Applications
- Marine outboard engines
- Engine Type
- 2-stroke, twin-cylinder
- Power Range
- 9.9HP–15HP
- Function
- Seals cylinder to crankcase/engine block
- Product Dimensions
- 8.5" L x 7.0" W x 0.63" H
What’s in the Box
- 1 x Cylinder Gasket (Replaces 682-11351-A0-00)
Installation Notes
- Ensure the engine is off and cool before beginning work.
- Carefully remove the old gasket and any residual material from the mating surfaces.
- Thoroughly clean both the cylinder and crankcase surfaces. Check for warping, cracks, or significant carbon deposits.
- Position the new gasket, ensuring it aligns correctly with all bolt holes and passages.
- Reassemble the components and tighten all fixings to the manufacturer's recommended torque specifications in the correct sequence.
Troubleshooting & FAQ
How do I know if my cylinder gasket is failing?
Common signs of a blown cylinder gasket include loss of compression, engine overheating, water or oil leaking from the seam between the cylinder and block, or a noticeable drop in engine performance. A compression test is the most definitive way to diagnose the issue.
Will this fit my specific engine model if it's not listed?
If your exact model and year are not in the compatibility table, do not assume fitment. Please verify the required OEM part number in your engine's service manual or parts diagram. If it matches one of the numbers in our Part Number Matrix, it will fit.
Can I reuse my old cylinder gasket?
No. Cylinder gaskets are single-use components designed to compress and create a seal. Once removed, they lose their sealing ability and must be replaced with a new one to prevent leaks and ensure proper engine function.
What is required for a successful installation?
The most critical steps are ensuring the mating surfaces on the engine block and cylinder are perfectly clean, flat, and free of old gasket material or debris. Use a torque wrench to tighten bolts to the specified values in the recommended sequence to ensure even pressure.
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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