PRODUCT DETAILS
Timing Belt / Cam Belt for Mercury & Mariner 25 HP 30 HP 40 HP 50 HP 60 HP Outboards
Premium-quality aftermarket timing belt / cam belt for selected Mercury and Mariner 25 HP, 30 HP, 40 HP, 50 HP and 60 HP 4-stroke outboard engines.
The timing belt synchronises the crankshaft and camshaft to maintain accurate valve timing and reliable engine operation.
Designed as a replacement for Mercury 831294, later superseded by 8M0065179 and 8M0151040. Mercury parts diagrams confirm 8M0151040 as the replacement for both earlier numbers.
Fits Mercury & Mariner 4-Stroke Outboards
25 HP
- Selected 25 HP
- 2 Cylinder
- 4 Stroke
30 HP
- Selected 30 HP
- 3 Cylinder
- Carburettor models
- EFI models
- 4 Stroke
40 HP
- Selected 40 HP
- 3 Cylinder
- Carburettor / EFI applications
- Selected 4 Cylinder EFI
- 4 Stroke
50 HP
- Selected 50 HP
- 4 Cylinder
- EFI
- 4 Stroke
60 HP
- Selected 60 HP
- 4 Cylinder
- EFI
- 4 Stroke
Independent application data for this belt specifically identifies 25 HP FourStroke, 30 HP 3-cylinder carb/EFI, 40 HP 3-cylinder EFI and 40/50/60 HP 4-cylinder EFI applications.
Replaces Mercury / Mariner Part Numbers
- 8M0151040
- 57-8M0151040
- 8M0065179
- 57-8M0065179
- 831294
- 578M0151040
- 578M0065179
Current Mercury Reference
57-8M0151040 / 8M0151040
831294 is an earlier Mercury timing belt number that has been superseded by the later belt.
OEM part numbers are used for identification and reference purposes only.
Product Features
- Timing belt / cam belt
- For selected Mercury & Mariner outboards
- 25 HP
- 30 HP
- 40 HP
- 50 HP
- 60 HP
- 4 Stroke
- Selected 2-cylinder applications
- Selected 3-cylinder applications
- Selected 4-cylinder applications
- Carburettor and EFI applications depending on engine model
- Marine-grade quality aftermarket part
- Manufactured to OEM specifications
- Replacement for the corresponding OEM application
- New replacement part
Important – Please Check Compatibility
Please do not order by horsepower alone.
Mercury and Mariner produced several different 25 HP, 30 HP, 40 HP, 50 HP and 60 HP 4-stroke engine families, and not every engine within these horsepower ratings uses this timing belt.
Serial number is particularly important with this part. Mercury's current information specifies 8M0151040 for 30–60 HP FourStroke engines from serial number 1C453840 and above, while parts catalogues also cross the belt to earlier engine applications using 831294.
Before purchasing, please check:
- Engine horsepower
- Engine is 4 Stroke
- Number of cylinders
- Carburettor or EFI
- Engine model
- Engine serial number
- Existing timing belt
- Original Mercury / Mariner part number
For the safest identification, check that your engine requires:
831294 / 8M0065179 / 8M0151040
If the belt looks the same as yours, this does not always mean it is the correct one for your outboard.
If you are unsure, please send SSI Marine your engine serial number before purchasing and our technical team will be happy to check compatibility.
Why Buy From SSI Marine?
- Marine-grade aftermarket & OEM-spec parts
- Workshop-tested products
- More than 10 years supplying outboard parts
- UK stock
- Same working day dispatch before 1 PM Monday–Friday
- Royal Mail Tracked 24
- Technical support from experienced outboard specialists
- Collection available from Leigh, Greater Manchester
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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