Timing Belt for Yamaha F75–F115 and LF115 4-Stroke Outboards – Replaces 67F-46241-00, 57-804145
Timing Belt for Yamaha F75–F115 and LF115 4-Stroke Outboards – Replaces 67F-46241-00, 57-804145 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Timing Belt for Yamaha F75–F115 and LF115 4-Stroke Outboards – Repl...
Timing Belt for Yamaha F75–F115 and LF115 4-Stroke Outboards – Replaces 67F-46241-00, 57-804145 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Timing Belt is a replacement marine belt for selected Yamaha and Mercury Mariner 4-stroke outboard engines. It is intended to maintain correct synchronization between the crankshaft and camshaft during engine operation. Confirm the exact engine model, year, and serial number against your service information before ordering.
For Yamaha applications, this belt replaces OEM reference 67F-46241-00. For Mercury Mariner applications, it replaces 57-804145 and is listed for selected 90 and 115 HP 4-stroke engines. The aftermarket cross-reference is 18-15131.
- Replacement timing belt for selected Yamaha and Mercury Mariner 4-stroke outboards
- Fits the Yamaha F75, F80, F90, F100, F115, and LF115 applications listed below
- Single belt supplied; this is not a multi-part timing-belt kit
- Recommended maintenance interval: 5 years or 100 hours of use, as specified in the product information
Part Number Matrix
Use these manufacturer and aftermarket references to compare the belt with the part being replaced.
| Brand or Source | Part Number | Reference Type |
|---|---|---|
| Yamaha | 67F-46241-00 | OEM reference |
| Mercury Mariner | 57-804145 | OEM reference |
| Mercury Mariner | 57804145 | Alternate number format listed in product records |
| Sierra | 18-15131 | Aftermarket cross-reference |
Engine & Model Compatibility
The company fitment records identify the following Yamaha applications. Mercury fitment is limited to selected 90 and 115 HP 4-stroke engines using OEM reference 57-804145; verify the engine serial number and parts diagram before purchase.
| Brand | Engine Model or Family | Rated HP | Stroke | Years Listed |
|---|---|---|---|---|
| Yamaha | F75 | 75 | 4-Stroke | 2003–2011 |
| Yamaha | F80 | 80 | 4-Stroke | 1999–2003 |
| Yamaha | F90 | 90 | 4-Stroke | 2005–2015 |
| Yamaha | F100 | 100 | 4-Stroke | 1999–2003 |
| Yamaha | F115 | 115 | 4-Stroke | 2000–2014 |
| Yamaha | LF115 | 115 | 4-Stroke | 2000–2014 |
| Mercury Mariner | Selected 90 HP applications using 57-804145 | 90 | 4-Stroke | Verify serial number |
| Mercury Mariner | Selected 115 HP applications using 57-804145 | 115 | 4-Stroke | Verify serial number |
Technical Specs
- Part Type
- Timing Belt
- Product Type
- Single replacement belt
- Yamaha OEM Reference
- 67F-46241-00
- Mercury Mariner OEM Reference
- 57-804145; 57804145
- Aftermarket Cross-Reference
- 18-15131
- Compatible Brands
- Yamaha, Mercury Mariner
- Engine Type
- Selected 4-stroke outboard engines
- Yamaha Horsepower Range
- 75–115 HP, as listed by model family
- Mercury Horsepower Applications
- 90 and 115 HP, subject to serial-number verification
- Recommended Replacement Interval
- 5 years or 100 hours of use
What's in the Box
- 1 × Timing Belt
Installation Notes
- Disconnect the battery, remove the engine cowling, and allow the engine to cool before beginning work.
- Consult the correct service manual for the exact engine model, year, and serial-number range.
- Rotate the crankshaft to align the specified timing marks before removing the existing belt.
- Remove the timing cover or related access components as required by the engine design.
- Release belt tension according to the service procedure and remove the old belt from the pulleys.
- Inspect the tensioner, idler components, sprockets, and belt-contact surfaces for wear or damage.
- Install the replacement belt in the correct direction and route it around the crankshaft, camshaft, and tensioner components as specified by the service manual.
- Keep all timing marks aligned during installation and set belt tension to the manufacturer's specification.
- Rotate the crankshaft by hand as directed in the service manual and recheck the timing marks before starting the engine.
- Reinstall the timing cover and any removed components, then perform a careful operational check.
Incorrect timing-belt installation or tension can cause poor engine operation or internal engine damage. Professional installation is recommended if the required procedure or specifications are not familiar.
Maintenance & FAQ
When should this timing belt be replaced?
The product information recommends replacement every 5 years or 100 hours of use. Inspect the belt regularly and follow the maintenance schedule for your specific engine.
Does this belt fit every Yamaha or Mercury 75–115 HP outboard?
No. Fitment is limited to the Yamaha model families and years listed above. Mercury Mariner coverage is listed for selected 90 and 115 HP 4-stroke applications using 57-804145. Confirm the exact model and serial number before ordering.
Is this a complete timing-belt kit?
No. This listing contains one replacement timing belt only. Tensioners, pulleys, covers, gaskets, and other service components are not included.
Should the tensioner and pulleys be replaced at the same time?
Inspect the tensioner, idlers, and sprockets during belt replacement. Replace any worn or damaged components according to the engine manufacturer's service procedure.
Can I install the belt without special tools?
Installation requirements vary by engine. The correct service manual, timing-mark procedure, torque specifications, and tension-setting method should be used. Seek professional service if these requirements are unavailable.
Is this an OEM belt?
No. This is an aftermarket replacement belt that references Yamaha OEM 67F-46241-00 and Mercury Mariner OEM 57-804145 for application identification.
Safety & Important Information
- Verify the OEM number, engine model, year, and serial number before ordering.
- Do not rely on horsepower alone to confirm fitment.
- Compare the replacement belt with the original belt and the applicable parts diagram.
- Disconnect the battery and follow all service-manual safety procedures before installation.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine replacement parts selected for common outboard maintenance and repair applications.
- Clear part-number and fitment information to help support accurate ordering.
- Customer support is available for product and application questions.
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