804295T Thermo Sensor for Mercury 75HP 80HP 90HP 100HP 115HP | JLM Marine

804295T Thermo Sensor for Mercury 75HP 80HP 90HP 100HP 115HP Outboard Engine

This thermo sensor is designed to fit Mercury outboard engines ranging from 75HP to 115HP. Engineered for reliable temperature monitoring, it ensures your engine operates within safe thermal parameters, preventing overheating and potential damage.

This aftermarket replacement directly replaces Mercury Mariner OEM part number 804295T, providing a cost-effective solution without compromising performance or quality.

• Direct replacement for Mercury OEM 804295T
• Fits multiple Mercury horsepower ratings: 75HP, 80HP, 90HP, 100HP, 115HP
• Essential for accurate engine temperature regulation

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.

Technical Specifications

Package Contents

Your purchase includes:

• 1 × Outboard Thermo Sensor

Installation Guide

1. Disconnect the battery to ensure safety during installation.
2. Locate the existing thermo sensor on your Mercury outboard engine, typically mounted on the cylinder head or engine block.
3. Carefully disconnect the electrical connector from the old sensor.
4. Using an appropriate wrench or socket, unscrew the old thermo sensor in a counterclockwise direction.
5. Inspect the mounting hole and threads for debris or corrosion; clean if necessary.
6. Apply a small amount of anti-seize compound to the threads of the new sensor (optional but recommended).
7. Hand-thread the new 804295T thermo sensor into the mounting hole clockwise to avoid cross-threading.
8. Tighten the sensor to the manufacturer's specified torque using a torque wrench.
9. Reconnect the electrical connector firmly, ensuring it clicks or locks into place.
10. Reconnect the battery and start the engine to verify proper operation.
11. Monitor the temperature gauge to confirm the sensor is reading correctly.
12. If any warning lights appear or readings seem abnormal, shut down the engine and recheck connections.

Troubleshooting & FAQ

Q: How do I confirm this thermo sensor fits my Mercury engine?
A: Cross-reference your engine's horsepower (75HP, 80HP, 90HP, 100HP, or 115HP) with the compatibility table above. Verify your original part number is 804295T by checking your engine's parts diagram or existing sensor.

Q: What are the symptoms of a failing thermo sensor?
A: Common signs include erratic temperature gauge readings, engine overheating warnings, poor fuel efficiency, or the engine running hotter than normal. If you experience any of these, inspect and test the sensor.

Q: How often should I replace the thermo sensor?
A: Thermo sensors typically last many years under normal conditions. Replace it if you notice faulty temperature readings, during major engine maintenance, or as part of troubleshooting overheating issues.

Q: Can I install this sensor myself, or do I need a professional?
A: If you have basic mechanical skills and tools, you can install it yourself following the guide above. However, if you're unsure about torque specifications or electrical connections, professional installation is recommended.

Q: OEM vs. Aftermarket?
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.