Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2)

Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2)

This thermostat kit is designed for Mercury Marine 135-200 HP V6 four-stroke outboard engines (1984-1998), including V135, V150, V175, V200, XR4, MAGNUM II, and XR6 models. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.

This kit serves as a direct replacement for Mercury Marine part numbers 75692T2, 75692Q2, and 75692T3, as well as GLM Marine part number GLM13340.

• Includes two thermostats and two gaskets for a complete installation.
• Engineered for a precise 143°F (62°C) temperature rating.
• Manufactured in an ISO9002 certified facility to meet stringent quality standards.

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

• 2 x Thermostat (Replaces 75692Q2)
• 2 x Rubber Gasket

Installation Guide

1. Ensure the engine is cool and disconnect the battery.
2. Drain the engine coolant into a suitable container.
3. Locate the thermostat housing on the engine block.
4. Carefully remove the bolts securing the thermostat housing cover.
5. Take out the old thermostat and its gasket. Note its orientation.
6. Thoroughly clean the mating surfaces of the housing and cover.
7. Install the new thermostat and gasket in the correct position.
8. Reattach the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Refill the cooling system with the appropriate coolant.
10. Reconnect the battery, start the engine, and check for any leaks around the housing.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: Please review the "Compatible Engine Models" table. For Mercury engines, it's crucial to check your serial number against the listed ranges: 135-150HP V-6 (A9046446 and higher), 175HP V-6 (C100861 and higher), and 200HP V-6 (6435503 and higher). Using the linked guides to verify your model and part numbers is the most reliable method.

Q: What are the common signs of a failing thermostat?
A: A faulty thermostat can cause the engine to overheat (if stuck closed) or run too cool and inefficiently (if stuck open). You might notice the temperature gauge reading higher or lower than normal after the engine has warmed up.

Q: How often should I replace my thermostats?
A: Thermostats are a critical part of the cooling system and should be inspected regularly. It is recommended to replace them every 2-3 years as part of preventative maintenance, or immediately if you notice temperature regulation issues.

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.