6DA-12411-01 Thermostat for Yamaha F150 F175 F200 | JLM Marine

Thermostat for Yamaha F150 F175 F200 Outboard Engines

This high-quality aftermarket thermostat is engineered to fit Yamaha 4-stroke outboard engines in the F150, F175, and F200 series. Designed to regulate engine temperature efficiently, it ensures optimal performance and protects your motor from overheating during operation.

Direct replacement for OEM part numbers: 6DA-12411-00, 6DA-12411-01, and aftermarket Sierra 18-3636. This thermostat delivers reliable temperature control for your Yamaha marine outboard.

• Fits Yamaha F150, F175, and F200 4-stroke outboard models
• Replaces OEM 6DA-12411-00 / 6DA-12411-01 and Sierra 18-3636
• Ensures proper engine cooling and prevents overheating

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.

Technical Specifications

Package Contents

• 1 × Thermostat

Installation Guide

1. Preparation: Ensure the engine is completely cool and disconnect the battery to prevent accidental starting.
2. Drain Coolant: Locate and drain the engine coolant into an appropriate container following your engine manual.
3. Access Thermostat Housing: Remove the bolts or clamps securing the thermostat housing cover. Keep track of all fasteners.
4. Remove Old Thermostat: Carefully extract the old thermostat and inspect the housing for corrosion or debris.
5. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and cover, removing old gasket material and residue.
6. Install New Thermostat: Position the new thermostat in the housing with the correct orientation (spring side typically faces the engine block).
7. Replace Gasket/Seal: Use a new gasket or O-ring as needed to ensure a proper seal.
8. Reassemble Housing: Reinstall the thermostat housing cover and tighten bolts to manufacturer's torque specifications.
9. Refill Coolant: Refill the cooling system with the recommended coolant type and quantity per your engine's specifications.
10. Bleed Air: Follow your engine manual to bleed any trapped air from the cooling system.
11. Reconnect Battery: Reconnect the battery and start the engine, checking for leaks around the thermostat housing.
12. Test Operation: Allow the engine to reach operating temperature and verify proper cooling system function.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my specific Yamaha engine?
A: Verify that your outboard is a Yamaha F150, F175, or F200 4-stroke model. Cross-check your original part number against 6DA-12411-00 or 6DA-12411-01. You can also use the Yamaha serial number guide or parts diagrams linked above to confirm compatibility.

Q: How often should I replace my outboard thermostat?
A: Thermostats should be inspected annually and replaced every 2–3 years or according to your engine manufacturer's maintenance schedule. Replace immediately if you experience overheating, erratic temperature readings, or coolant leaks.

Q: What are the signs of a failing thermostat?
A: Common symptoms include engine overheating, slow warm-up times, fluctuating temperature gauge readings, or coolant leaking from the thermostat housing. If you notice any of these issues, inspect and replace the thermostat as needed.

Q: Can I install this thermostat myself or do I need a mechanic?
A: If you have basic mechanical skills and the proper tools, you can install this thermostat yourself by following the installation guide and your engine manual. However, professional installation is recommended to ensure proper torque settings and system bleeding.

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