Sierra 18-0918 Exhaust Manifold Gasket Mercury Mariner 50HP 2-Stroke
18-0918 L4
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Sierra 18-0918 Exhaust Gasket
Mercury / Mariner 50HP two-stroke applications
The Sierra 18-0918 is a plate-to-exhaust-manifold gasket for compatible Mercury and Mariner 50HP two-stroke outboards. It provides the heat-resistant sealing surface required when the exhaust plate or manifold is removed.
Key Features
- ✔ Genuine Sierra-branded aftermarket gasket
- ✔ Plate-to-exhaust-manifold application
- ✔ Heat-resistant gasket material
- ✔ For selected 50HP two-stroke outboards
- ✔ One gasket supplied
Technical Specs
| Brand | Sierra |
| Part number | 18-0918 |
| Part type | Exhaust manifold / plate gasket |
| Typical application | Mercury / Mariner 50HP two-stroke |
| Quantity | 1 gasket |
| 4Boats SKU | 18-0918 L4 |
Compatibility / Fitment Guide
Listed for selected Mercury and Mariner 50HP (37kW) two-stroke outboards using the corresponding exhaust plate and manifold. Confirm the gasket outline, original reference and engine serial number before ordering.
Part Number Cross Reference
| Sierra | 18-0918 |
| 4Boats SKU | 18-0918 L4 |
This is a genuine Sierra aftermarket gasket, not a Mercury or Mariner-branded part.
Questions & Answers
Is this a genuine Mercury gasket?
No. It is a genuine Sierra replacement.
Does it fit every Mercury 50HP?
No. Confirm the exhaust assembly and serial number.
How many are included?
One gasket is supplied.
Can the old gasket be reused?
A new gasket should be installed whenever the joint is dismantled.
Note: Clean the mating surfaces carefully and follow the engine manual for sealant, bolt sequence and torque.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
