Timing Belt for Yamaha F9.9/F15, Mercury/Mariner 9.9/15, Tohatsu 9.9–20 HP and Evinrude/Johnson 15 HP 4-Stroke Outboards
Timing Belt for Yamaha F9.9/F15, Mercury/Mariner 9.9/15, Tohatsu 9.9–20 HP and Evinrude/Johnson 15 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Timing Belt for Yamaha F9.9/F15, Mercury/Mariner 9.9/15, Tohatsu 9....
Timing Belt for Yamaha F9.9/F15, Mercury/Mariner 9.9/15, Tohatsu 9.9–20 HP and Evinrude/Johnson 15 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket engine timing belt is a direct replacement for selected 4-stroke marine outboards. It is sold as one belt and is intended to maintain correct camshaft-to-crankshaft timing during engine operation.
Company fitment records identify this belt for selected Yamaha F9.9 and F15 models, Mercury and Mariner 9.9 HP and 15 HP 4-stroke models within the listed serial-number ranges, Tohatsu 9.9–20 HP 4-stroke outboards, and Evinrude/Johnson/OMC/BRP 15 HP 4-stroke applications. Confirm the complete model and serial-number conditions before ordering.
- Product type: Replacement engine timing belt
- Quantity: One belt
- Application: Selected 4-stroke outboard engines
- Maintenance guidance: The company catalog recommends replacement at 5 years or 100 hours of use, subject to the engine manufacturer's service instructions.
Part Number References
Use the manufacturer reference for your specific engine when confirming compatibility. Reference numbers are listed by application and should not be treated as universal fitment across every engine model.
| Application | Manufacturer Reference | Aftermarket Reference |
|---|---|---|
| Yamaha Outboard | 66M-46241-00 | 18-15137 |
| Mercury / Mariner | 835392Q; 57-835392Q; 57835392Q; 895120002; 57-895120002 | 18-15147 |
| Tohatsu | 3H8-10061-0; 3H8100610M | — |
| Evinrude / Johnson / OMC / BRP | 5041079 | — |
Engine Compatibility
Fitment depends on the brand, model, production period, and—especially for Mercury and Mariner engines—the serial-number range. Match all available information before installation.
Yamaha 4-Stroke Outboards
| Brand | Model | Rated HP | Stroke | Years | Reference |
|---|---|---|---|---|---|
| Yamaha | F9.9 | 9.9 | 4-Stroke | 2005–2006 | 66M-46241-00 |
| Yamaha | F15 | 15 | 4-Stroke | 1998–2005 | 66M-46241-00 |
Mercury and Mariner 4-Stroke Outboards
| Brand | Rated HP | Stroke | Serial Number Range | Reference |
|---|---|---|---|---|
| Mercury / Mariner | 9.9 | 4-Stroke | 0G760300–1B226999 | 57-835392Q |
| Mercury | 15 | 4-Stroke | 0G760300–1B226999 | 57-835392Q |
| Mercury | 15 | 4-Stroke | 1B227000–1B727495 | 57-835392Q |
For Mercury and Mariner applications, the serial-number range is part of the fitment specification. Do not rely on horsepower alone.
Tohatsu 4-Stroke Outboards
| Brand | Rated HP | Stroke | Model or Application | Reference |
|---|---|---|---|---|
| Tohatsu | 9.9 | 4-Stroke | Selected 9.9 HP outboards | 3H8-10061-0; 3H8100610M |
| Tohatsu | 15 | 4-Stroke | Selected 15 HP outboards | 3H8-10061-0; 3H8100610M |
| Tohatsu | 18 | 4-Stroke | Selected 18 HP outboards | 3H8-10061-0; 3H8100610M |
| Tohatsu | 20 | 4-Stroke | Selected 20 HP outboards | 3H8-10061-0; 3H8100610M |
Evinrude, Johnson, OMC and BRP 4-Stroke Outboards
| Brand | Rated HP | Stroke | Application | Reference |
|---|---|---|---|---|
| Evinrude / Johnson / OMC / BRP | 15 | 4-Stroke | Selected 15 HP outboards | 5041079 |
Technical Specifications
- Product Type
- Engine timing belt
- Part Configuration
- Single replacement belt; not a complete timing-belt service kit
- Application
- Selected 4-stroke gasoline outboard engines
- Installation
- Direct replacement when the application and reference number match
- Included Components
- One timing belt
What's in the Box
- 1 x Engine timing belt
Tensioners, pulleys, seals, keys, covers, and other engine components are not included.
Installation Notes
- Turn off the engine, disconnect the battery where applicable, and allow the engine to cool before service.
- Remove the cowling and timing-belt covers according to the engine manufacturer's service procedure.
- Set the crankshaft and camshaft to the manufacturer's specified timing positions before removing the old belt.
- Inspect the pulleys, tensioner, seals, and surrounding components for wear, contamination, or damage.
- Install the replacement belt without forcing, twisting, or contaminating it with oil or fuel.
- Set belt tension and verify all timing marks using the correct service manual.
- Rotate the engine by hand as specified by the manufacturer and recheck timing before starting the engine.
- Reinstall the covers and all removed components, then test the engine for correct operation.
Timing-belt installation requires accurate timing alignment. Professional installation is recommended if the required tools or service information are not available.
Maintenance and FAQ
How do I confirm that this belt fits my engine?
Match the engine brand, model, horsepower, stroke, production year where listed, and Mercury or Mariner serial-number range against the compatibility tables. Also compare the manufacturer reference on the existing belt or in the engine parts manual.
When should the timing belt be replaced?
The company catalog recommends a 5-year or 100-hour maintenance interval. Always follow the engine manufacturer's service manual if it specifies a different interval or inspection procedure.
What are signs that a timing belt may need replacement?
Cracking, fraying, missing or damaged teeth, oil contamination, abnormal slack, or visible wear are reasons to stop using the belt and inspect the complete timing system. An engine that runs poorly or will not start may have timing-system problems, but diagnosis should be performed before replacing parts.
Is this a complete timing-belt kit?
No. This listing is for one timing belt only. Tensioners, pulleys, seals, keys, and other components are not included.
Is this an OEM belt?
This listing is for an aftermarket replacement belt. The manufacturer references shown above are provided for application identification and cross-reference purposes.
Safety and Important Information
- Verify the complete engine identification and reference number before ordering.
- Mercury and Mariner compatibility is serial-number dependent; horsepower alone is not sufficient.
- Do not install a belt that is damaged, contaminated, or visibly different from the required part.
- Incorrect timing-belt installation can cause serious engine damage. Use the manufacturer's service manual.
About Sea Sierra
- Marine Replacement Parts — Parts selected for common outboard maintenance and repair applications.
- Application-Focused Listings — Compatibility information is organized by engine brand, model, horsepower, stroke, year, and serial range where available.
- Maintenance Support — Clear product information helps you confirm the correct replacement before installation.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
