Outboard Engine Timing Belt for Yamaha F75-F115 & Mercury 75-115HP (67F-46241-00, 57-804145)

Timing Belt – Fits Yamaha F75-F115 & Mercury 75-115HP Outboard Motors

This timing belt is a direct replacement for Yamaha F75, F80, F90, F100, and F115 4-stroke outboard motors from 1999–2017. It also fits a wide range of Mercury and Mariner 75HP, 80HP, 90HP, 100HP, and 115HP 4-stroke outboard models from the same period.

Engineered to meet or exceed OEM specifications, this belt ensures precise valve timing for reliable engine performance. It replaces Yamaha part numbers 67F-46241-00-00 and 67F-46241-00, and Mercury part numbers 57-804145 and 804145.

• Installation: Designed for a direct OEM-style fit, requiring no modifications.
• Material: Constructed from high-durability HNBR (Hydrogenated Nitrile Butadiene Rubber) for longevity and resistance to heat and oil.
• Function: Critical component for synchronizing the crankshaft and camshafts in 4-stroke engines.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Yamaha

Mercury / Mariner

Technical Specifications

Package Contents

• 1 x Timing Belt (67F-46241-00-00/57-804145)

Installation Guide

Replacing a timing belt is a critical maintenance task. Professional installation is highly recommended. The general steps are outlined below:

1. Safety First: Disconnect the battery and ensure the engine is cool.
2. Access the Belt: Remove the engine cowling and any other components obstructing the timing belt cover, such as the flywheel.
3. Align Timing Marks: Carefully rotate the engine to align the timing marks on the camshaft sprockets and crankshaft. Refer to your service manual for their exact locations.
4. Release Tension: Loosen the timing belt tensioner pulley to relieve tension on the belt.
5. Remove Old Belt: Carefully slide the old timing belt off the sprockets.
6. Install New Belt: Install the new belt, ensuring any directional arrows are pointed correctly and the teeth engage properly with all sprockets.
7. Apply Tension: Re-engage the tensioner to apply the correct tension to the new belt as specified in your service manual.
8. Verify Alignment: Double-check that all timing marks are still perfectly aligned. Manually rotate the engine two full turns and re-check the marks.
9. Reassemble: Reinstall the timing belt cover, flywheel, and any other components you removed. Reconnect the battery.
10. Test Engine: Start the engine and listen for any unusual noises. Ensure it idles smoothly.

Troubleshooting & FAQ

How do I confirm this belt fits my Yamaha or Mercury engine?
First, check the comprehensive compatibility list above to see if your engine's model and year range are included. For absolute certainty, cross-reference the OEM part number stamped or printed on your old belt with the numbers listed in our "Part Number Cross-Reference" section (e.g., 67F-46241-00-00 or 57-804145).

How often should I replace my outboard's timing belt?
Always refer to your engine’s official service manual for the manufacturer's recommended replacement interval. As a general guideline, many manufacturers suggest replacement every 5 years or 1000 operating hours, whichever comes first. Annual inspection for cracks, fraying, or hardening is also recommended.

What are the signs of a failing timing belt?
Common symptoms include a ticking noise from the engine bay, engine misfires, rough idling, or difficulty starting the motor. Visually, a failing belt may show signs of cracking, glazing (shiny surface), fraying edges, or missing teeth. A broken timing belt will cause catastrophic engine damage, so replacement is critical maintenance.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.