Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2, 75692T2, 75692T3, GLM13340)
Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2, 75692T2, 75692T3, GLM13340) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces ...
Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2, 75692T2, 75692T3, GLM13340) is backordered and will ship as soon as it is back in stock.
Product Details
This Outboard Thermostat Kit – Fits Mercury Marine 135-200 HP (Replaces 75692Q2) is designed for Mercury Marine 135-200 HP V6 four-stroke outboard engines produced between 1984 and 1998. It covers models including the V135, V150, V175, V200, XR4, MAGNUM II, and XR6.
It serves as a direct interchange for Mercury Marine part numbers 75692T2, 75692Q2, and 75692T3, as well as GLM Marine GLM13340.
- Engineered for direct OEM replacement installation.
- Manufactured in an ISO9002 certified facility for quality assurance.
- The kit includes two thermostats and two matching gaskets.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 75692T2 |
| Mercury Marine | 75692Q2 |
| Mercury Marine | 75692T3 |
| GLM Marine | GLM13340 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury engines, verify your serial number to ensure correct fitment: 135-150HP V-6 (A9046446 and higher), 175HP V-6 (C100861 and higher), 200HP V-6 (6435503 and higher).
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | V135 | 135 | 4-Stroke | 1986–1988 | 75692Q2 |
| Mercury | V150 | 150 | 4-Stroke | 1986–1988 | 75692Q2 |
| Mercury | XR4 | 4-Stroke | 1991 | 75692Q2 | |
| Mercury | MAGNUM II | 4-Stroke | 1991–1998 | 75692Q2 | |
| Mercury | XR6 | 4-Stroke | 1992–1998 | 75692Q2 | |
| Mercury | V175 | 175 | 4-Stroke | 1989–1990 | 75692Q2 |
| Mercury | V200 | 200 | 4-Stroke | 1984–1988 | 75692Q2 |
Technical Specs
- Product Type
- Thermostat Kit
- Installation
- Direct OEM Replacement
- Temperature Rating
- 143°F (62°C)
- Weight
- 0.15 lb (0.068 kg)
- Production Standard
- ISO9002 certified factory
- Package Quantity
- 2 thermostats with 2 gaskets
What’s in the Box
- 2 x Thermostat (75692Q2)
- 2 x Rubber Gasket
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Drain the engine cooling system into an appropriate container.
- Locate the thermostat housing on the engine block.
- Remove the bolts securing the housing cover. Note their orientation.
- Carefully remove the old thermostat and gasket.
- Clean the housing and cover surfaces, removing all old gasket material.
- Install the new thermostat, ensuring it is correctly seated.
- Place the new gasket onto the housing, aligning it with the bolt holes.
- Reinstall the housing cover and tighten bolts to the manufacturer's torque specifications.
- Refill the cooling system with the recommended coolant.
- Reconnect the battery, start the engine, and check for leaks and proper operating temperature.
Troubleshooting & FAQ
How do I know if my thermostat has failed?
Common signs of a failed thermostat include engine overheating, running too cold (not reaching operating temperature), erratic temperature gauge readings, and poor engine performance.
What temperature does this thermostat operate at?
This thermostat is rated to open at 143°F (62°C) to allow coolant to circulate and maintain optimal engine temperature.
Is this a single or dual-thermostat kit?
This is a complete kit containing two thermostats and two gaskets, as required for a full replacement on the specified V6 engines.
How often should I replace my outboard thermostat?
Thermostats should be inspected regularly and replaced every 1-2 years as part of preventative maintenance, or immediately if you notice signs of failure. This is especially critical for engines operated in saltwater.
What is the difference between OEM and aftermarket parts?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to OEM-level specifications with comparable materials and is manufactured in an ISO 9002 facility, with batch inspections for consistency.
How fast is shipping and what does it cost?
We ship worldwide quickly, with a typical transit time of 5–15 days. Standard shipping is free for most orders, and expedited options will appear at checkout if they are available for your location.
What is the warranty and return policy?
Our parts are covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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