Thermostat – Fits Mercury Marine 75-175 HP DFI Outboard Motors (Replaces 833072003)

Thermostat – Fits Mercury Marine 75-175 HP DFI Outboard Motors (Replaces 833072003)

This aftermarket thermostat is engineered to regulate engine temperature for select Mercury Marine 1.5L & 2.5L DFI 2-Stroke outboard motors (1998–2006+), including 3-cylinder and V6 configurations. It ensures the engine maintains its proper operating temperature for optimal performance, fuel efficiency, and longevity.

It is a direct replacement for Mercury part numbers 833072, 833072002, 833072003, 833072004, and Sierra 18-3536.

• Engineered for a 143°F (61.6°C) operating temperature.
• Designed as a direct-fit replacement for straightforward installation.
• Constructed from marine-grade metals for durability in harsh saltwater environments.

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

Package contents may vary between sellers. The most comprehensive packages include:

• 1 x Thermostat (Replaces 833072003)
• 2 x Thermostat Seals (Replaces 8M0204714)

Note: Some sellers may only include the thermostat without the seals. Please verify the package contents with the seller before making your purchase.

Installation Guide

Always consult your engine’s service manual for detailed instructions. The general process is as follows:

1. Ensure the engine is completely cool and disconnect the battery.
2. Drain the engine coolant into a suitable container.
3. Locate the thermostat housing on the engine block or cylinder head.
4. Remove the bolts securing the housing cover and carefully lift it off.
5. Take note of the old thermostat's orientation before removing it.
6. Clean both the housing and cover mating surfaces thoroughly, removing all old gasket or sealant material.
7. Install the new thermostat seal into the groove in the housing or on the thermostat itself.
8. Place the new thermostat into the housing in the correct orientation.
9. Re-install the housing cover and tighten the bolts to the manufacturer's specified torque.
10. Refill the cooling system with the recommended coolant.
11. Reconnect the battery, start the engine, and check for any leaks as it warms up to operating temperature.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my specific engine model?
A: The best way is to match your engine's serial number to the ranges listed in the "Compatible Engine Models" table. If your serial number falls within the specified range for your model and horsepower, it will fit.

Q: What are the signs of a faulty thermostat?
A: Common symptoms include the engine overheating (either at idle or high speeds) or the engine failing to reach its normal operating temperature, which can cause poor performance and increased fuel consumption. An incorrect temperature reading on your gauge is another key indicator.

Q: Does this thermostat include the required seals?
A: Package contents can vary. While some packages include two thermostat seals (part number 8M0204714), others may only contain the thermostat. It is crucial to verify the contents with your seller before purchasing.

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.