Timing Belt – Fits Tohatsu, Mercury, Yamaha 9.9-20HP 4-Stroke Outboards (Replaces 3H8-10061-0, 57-835392Q)

Timing Belt – Fits Tohatsu, Mercury, Yamaha 9.9-20HP 4-Stroke Outboards

This high-quality aftermarket timing belt is engineered to meet or exceed OEM specifications, ensuring reliable engine synchronization for a wide range of 4-stroke outboards. It is designed for Tohatsu/Nissan 9.9-20HP (2002-2014), Mercury/Mariner 8-15HP (up to 2008), and Yamaha F9.9-F15 (1998-2005) models.

This component is a direct replacement for Tohatsu part 3H8-10061-0, Mercury part 57-835392Q, and Yamaha part 66M-46241-00-00, providing a dependable solution for routine maintenance or repair.

• Installation Type: Direct replacement for a straightforward installation.
• Durable Construction: Made from high-strength synthetic rubber with reinforcement fibers to resist stretching and degradation.
• Critical Function: Maintains precise camshaft and crankshaft timing for optimal engine performance and longevity.

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 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.

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.

Tohatsu/Nissan Models

Mercury/Mariner Models

Yamaha Models

Technical Specifications

Package Contents

• 1 x Timing Belt (Replaces OEM Parts 3H8-10061-0, 57-835392Q, 66M-46241-00-00)

Installation Guide

Warning: Incorrect installation can lead to catastrophic engine failure. Professional installation is highly recommended. Always consult your engine's service manual before starting.

1. Disconnect the battery and remove the engine cowl.
2. Locate and remove the timing belt cover. Identify the timing marks on the crankshaft and camshaft sprockets.
3. Carefully rotate the engine to align all timing marks. Do not proceed until the alignment is perfect.
4. Loosen the belt tensioner pulley and carefully slide the old timing belt off the sprockets.
5. Install the new timing belt, ensuring it is properly seated and the timing marks remain aligned.
6. Apply the correct tension to the belt as specified in your service manual. Do not over-tighten.
7. Manually rotate the engine two full revolutions in its normal direction of rotation. Re-verify that all timing marks are still perfectly aligned.
8. Reinstall the timing belt cover, engine cowl, and reconnect the battery.

Troubleshooting & FAQ

How do I confirm this timing belt fits my Mercury engine?
This belt fits specific Mercury 8-15HP 4-stroke models. The most reliable way to confirm fitment is by matching your engine's serial number to the ranges listed in the compatibility table above. For help finding your serial number, please consult our Mercury Serial Number Guide.

What are the signs that my timing belt needs to be replaced?
Common signs of a failing timing belt include a ticking or slapping noise from the engine, misfires, difficulty starting, rough idling, or visible fraying, cracking, and wear on the belt itself. Regular inspection is key.

How often should I replace my outboard's timing belt?
Replacement intervals vary by manufacturer and engine hours, but a general recommendation is to inspect it annually and replace it every 5 years or 500-1000 hours of use, whichever comes first. Always consult your engine's service manual for specific maintenance schedules.

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.