PRODUCT DETAILS
THERMOSTAT KIT
THERMOSTAT , THERMOSTAT SEAL , THERMOSTAT GASKET
FOR
MERCURY / MARINER OUTBOARD
40 50 60 HP
F40 F50 F60
4 CYLINDER
Thermostat Kit for Mercury Mariner Outboard 40HP, 50HP & 60HP EFI 4-stroke engines.
This complete kit contains the essential components required when replacing the thermostat assembly, helping maintain correct engine operating temperature and cooling system efficiency.
Kit Contains
- 1 × Thermostat
- 1 × Thermostat Seal
- 1 × Thermostat Gasket
Replaces Part Number
- Thermostat: 8M0117413
- Thermostat Seal: 27-887978
- Thermostat Gasket: 27-824853
Fitment
Mercury / Mariner Outboard Models
- F40 EFI
- F50 EFI
- F60 EFI
Engine Type
- 4-Stroke
- 4 Cylinder
- EFI Models
IMPORTANT
If the part looks the same as yours, it is not always the correct one for your outboard. Please double-check compatibility before ordering.
If you have any concerns regarding suitability, please contact us with your engine model and serial number and we will be happy to check compatibility for you.
Details
- Complete thermostat replacement kit
- Includes thermostat, seal & gasket
- Helps maintain correct engine operating temperature
- Suitable for Mercury & Mariner EFI outboards
- High-quality aftermarket / OEM-spec components
Why Buy from SSI Marine
Workshop-tested aftermarket & OEM-spec parts
Fast UK dispatch (same-day before 1 PM Mon–Fri)
Tracked 24-hour UK delivery
UK stock – collection available from Leigh (Manchester)
Technical support available
Buyer Responsibility
Please confirm compatibility with your engine model and serial number before purchase. If unsure, contact us — our technical team will be happy to help.
4 STROKE
EFI MODELS
Replaces Mercury part numbers :
Thermostat 8M0117413
Thermostat Seal : 27-887978
Thermosat gasket :27-824853
If the part looks the same like yours is not always the right one for your outboards so please double check.
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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