6AH-46241-00 Timing Belt for Yamaha F15CMLH F15CPLH F15CMSH F15CELH F15SEHA F15SMHA F15LPHA F15LEHA F15LMHA F15CESH F20ELH F20ELR F20ESR F20ESH F20SEA F20SMHA F20SEHA F20PLH F20PLR F20LMHA F20LEHA F20LPA F20LPHA F20MLH F20MSH F20LEA | JLM Marine

Timing Belt 6AH-46241-00 – Fits Yamaha 15HP & 20HP 4-Stroke Outboards

This timing belt is engineered for Yamaha 15HP and 20HP 4-stroke outboard engines, ensuring precise camshaft timing and oil pump operation. Designed to meet OEM specifications, this replacement belt fits a wide range of F15 and F20 series models across multiple production years.

Direct Replacement for: Yamaha OEM part number 6AH-46241-00 and Sierra 18-15136. This aftermarket component delivers reliable performance for oil pump drive systems in compatible Yamaha outboards.

• Critical timing component for oil pump operation
• Precision-engineered to OEM dimensional standards
• Compatible with both F15 and F20 4-stroke series 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.

Note: Models span production years 2006 and later. Verify your engine's year code (e.g., 0406, 0407, 0410, 0411, 0112–0118) to ensure compatibility.

Technical Specifications

Package Contents

• 1 × Timing Belt (6AH-46241-00)

Installation Guide

1. Disconnect the battery and remove the engine cowling to access the timing belt area. Ensure the engine is cool before beginning work.
2. Rotate the crankshaft to bring the engine to Top Dead Center (TDC) on cylinder #1. Align timing marks on the crankshaft and camshaft sprockets as specified in your service manual.
3. Remove the timing belt cover by loosening the retaining bolts. Keep all fasteners organized for reassembly.
4. Release tension on the old belt by loosening the tensioner pulley adjustment bolt. Carefully slide the old timing belt off the sprockets.
5. Inspect sprockets and tensioner for wear, damage, or debris. Clean mating surfaces and replace any worn components before installing the new belt.
6. Route the new timing belt around the crankshaft sprocket, oil pump sprocket, and camshaft sprocket in the correct direction. Ensure belt teeth fully engage sprocket grooves.
7. Apply proper tension using the tensioner pulley. Follow manufacturer torque specifications to avoid over- or under-tensioning.
8. Verify timing alignment by manually rotating the crankshaft two full revolutions. Recheck all timing marks; they must realign precisely at TDC.
9. Reinstall the timing belt cover and torque all cover bolts to specification. Double-check that no tools or debris remain in the engine bay.
10. Reconnect the battery and reinstall the engine cowling. Start the engine and listen for unusual noises; the belt should run smoothly without slipping.
11. Perform a test run at idle and varying RPMs. Monitor for vibrations or timing-related issues during the first few operating hours.
12. Re-inspect belt tension after the initial break-in period (first 5–10 hours). Adjust if necessary per service manual guidelines.

Troubleshooting & FAQ

Q: How do I confirm this timing belt fits my Yamaha outboard?
A: Cross-reference your engine's model number (e.g., F15CMLH, F20ELH) and year code with the compatibility table above. You can also verify part numbers using Yamaha's exploded diagrams or your engine's service manual.

Q: What are the signs that my timing belt needs replacement?
A: Common symptoms include unusual engine noise (ticking or whining), difficulty starting, rough idling, or visible belt cracks/fraying during inspection. Replace immediately if you notice any of these issues to prevent engine damage.

Q: How often should I replace the timing belt on my Yamaha 15HP or 20HP outboard?
A: Yamaha typically recommends timing belt inspection every 100 hours or annually, with replacement every 200–300 hours or as specified in your owner's manual. Operating conditions (saltwater, high hours) may require more frequent replacement.

Q: Can I install this belt myself, or do I need a professional?
A: Installation requires precise timing alignment and proper tensioning. If you have mechanical experience and access to a service manual, DIY installation is possible. However, professional installation is strongly recommended to avoid costly engine damage from improper timing.

Q: Will this aftermarket belt perform the same as the OEM Yamaha belt?
A: Yes. This belt is manufactured to OEM dimensional and material specifications in an ISO9002-certified facility. It provides equivalent performance and durability to the original Yamaha part at a more competitive price point.

Q: What's the difference between OEM and aftermarket parts?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.