PRODUCT DETAILS
Cylinder Head Gasket for Mercury & Mariner 4HP–5HP 2-Stroke Outboards
Replaces Mercury Part Numbers: 27-812939015, 27-812939
This high-quality marine gasket seals the cylinder head to the engine block, maintaining compression and preventing leaks in small Mercury and Mariner 2-stroke outboards. Ideal for engine servicing, rebuilds, or preventative maintenance.
Fits the following engines:
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Mercury 4HP 2-Stroke
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Mercury 5HP 2-Stroke
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Mariner 4HP 2-Stroke
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Mariner 5HP 2-Stroke
Key Features:
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Replaces OEM part 27-812939015
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Built to withstand marine conditions
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Reliable sealing performance
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Easy installation — direct OEM-style fit
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Perfect for small engine rebuilds or repairs
Please check compatibility before purchasing.
It is the buyer’s responsibility to confirm the correct fitment.
If you’re unsure, contact us — our SSI Marine team is happy to help.
Why Buy from SSI Marine?
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Trusted UK supplier of marine engine parts
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All items in stock — same-day dispatch (before 1 PM)
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24-hour delivery
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Expert marine support and advice
SHIPPING & DELIVERY
Delivery:
We offer free shipping on all orders over £150 (excluded outboard engines, trailers)
Standard Shipping - £ 8.50
Orders are typically shipped within 1 business day of receipt of payment. We ship via Royal Mail Tracked 24 delivery service. Delivery times vary depending on the delivery destination.
For engines delivery cost please ask for a quote.
It is the buyer's responsibility to ensure that the correct shipping address is supplied.
All item(s) will be despatched to the registered address.
Tracking your order:
Once your order has been shipped, you will receive a tracking number via email. You can track your order online using the tracking number provided.
Returns:
We accept returns of unused and undamaged items within 30 days of purchase.
To return an item please contact us for a return authorisation number. Return shipping costs are the responsibility of the customer.
Refunds:
Refunds will be issued for the purchase price of the item, less shipping costs. Refunds will be issued in the same form of payment as the initial purchase.
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