Outboard Thermostat Kit for Mercury Marine 135–200 HP V-6 2-Stroke Engines – 2 Thermostats with Gaskets
Outboard Thermostat Kit for Mercury Marine 135–200 HP V-6 2-Stroke Engines – 2 Thermostats with Gaskets is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Outboard Thermostat Kit for Mercury Marine 135–200 HP V-6 2-Stroke ...
Outboard Thermostat Kit for Mercury Marine 135–200 HP V-6 2-Stroke Engines – 2 Thermostats with Gaskets is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket outboard thermostat kit is intended for specified Mercury Marine 135–200 HP V-6 2-stroke outboard engines. The kit contains two thermostats and two matching rubber gaskets for a complete dual-thermostat replacement.
Reference numbers associated with this replacement include Mercury Marine 75692Q2, 75692T2, and 75692T3, plus GLM Marine GLM13340. Always compare the original part and confirm the engine serial-number range before ordering.
- Replacement thermostat kit for selected Mercury Marine V-6 outboards.
- Includes two thermostats and two matching gaskets.
- Designed for direct replacement of the corresponding original thermostat components.
- Aftermarket product; not manufactured or branded by Mercury Marine.
Part Number Matrix
Use these references to help compare the replacement with the part removed from your engine. A matching number alone does not replace model and serial-number verification.
| Brand | Part Number |
|---|---|
| Mercury Marine | 75692Q2 |
| Mercury Marine | 75692T2 |
| Mercury Marine | 75692T3 |
| GLM Marine | GLM13340 |
Engine & Model Compatibility
The following model and year information is provided as a fitment guide for the listed Mercury V-6 2-stroke applications. Mercury fitment can vary by serial number, so verify the complete engine identification before installation.
Common serial-number references include 135–150 HP V-6 engines from serial A9046446 and higher, 175 HP V-6 engines from serial C100861 and higher, and 200 HP V-6 engines from serial 6435503 and higher. Confirm the exact application with the engine service information.
| Brand | Model | Rated HP | Stroke | Years | OEM Reference |
|---|---|---|---|---|---|
| Mercury | V135 | 135 | 2-Stroke | 1986–1988 | 75692Q2 |
| Mercury | V150 | 150 | 2-Stroke | 1986–1988 | 75692Q2 |
| Mercury | XR4 | 135–150 | 2-Stroke | 1991 | 75692Q2 |
| Mercury | MAGNUM II | 150–200 | 2-Stroke | 1991–1998 | 75692Q2 |
| Mercury | XR6 | 150 | 2-Stroke | 1992–1998 | 75692Q2 |
| Mercury | V175 | 175 | 2-Stroke | 1989–1990 | 75692Q2 |
| Mercury | V200 | 200 | 2-Stroke | 1984–1988 | 75692Q2 |
Technical Specifications
- Product Type
- Outboard thermostat kit
- Application
- Selected Mercury Marine 135–200 HP V-6 2-stroke outboard engines
- Installation
- Direct aftermarket replacement
- Temperature Rating
- 143°F (62°C)
- Weight
- 0.15 lb (0.068 kg)
- Package Quantity
- 2 thermostats with 2 rubber gaskets
- Brand Status
- Aftermarket replacement, not an original Mercury Marine part
What’s in the Box
- 2 × Outboard thermostat
- 2 × Matching rubber gasket
Installation Notes
- Disconnect the battery or follow the applicable engine safety procedure, and allow the engine to cool completely.
- Remove the thermostat housing covers according to the engine service manual.
- Note the position and orientation of each original thermostat before removal.
- Remove the old thermostats and gaskets, then clean the mating surfaces without damaging the housing.
- Install each replacement thermostat in the correct orientation.
- Fit the new gaskets and reinstall the thermostat housing covers.
- Tighten the fasteners to the manufacturer's specified torque; do not guess the torque value.
- Run the engine using the correct water supply or test tank procedure and check for leaks, proper water flow, and normal operating temperature.
- Stop operation immediately if the engine overheats or if coolant or water leaks are observed.
Troubleshooting & FAQ
How do I know if an outboard thermostat has failed?
Possible symptoms include overheating, an engine that runs too cool, inconsistent temperature behavior, restricted cooling-water flow, or an abnormal temperature-gauge reading. Diagnose the cooling system before replacing parts.
What temperature does this thermostat operate at?
The listed thermostat rating is 143°F (62°C). Actual engine operating temperature depends on the complete cooling system, engine condition, water supply, and operating conditions.
Is this a single or dual-thermostat kit?
This is a dual-thermostat kit containing two thermostats and two matching gaskets for applications that use two thermostats.
Will this fit every Mercury 135–200 HP outboard?
No. Fitment depends on the exact model, production year, stroke configuration, and serial-number range. Compare your original part number and verify the complete engine identification before purchase.
How often should outboard thermostats be replaced?
Inspect thermostats as recommended in the engine service information and whenever overheating, abnormal temperature behavior, or cooling-system contamination is suspected. Saltwater use and debris can increase service needs.
Is this an OEM Mercury Marine part?
No. This listing is for an aftermarket replacement kit. The Mercury and GLM numbers shown above are reference and interchange numbers used to help identify the intended application.
How fast is shipping and what does it cost?
Shipping options, delivery estimates, and cost are calculated at checkout based on the destination and service selected.
What is the warranty and return policy?
Warranty and returns are subject to the seller's current policy. Contact support with your order details if you receive a damaged, incorrect, or defective item.
Safety & Important Information
- Verify the model, year, stroke, serial-number range, original part, and gasket configuration before ordering.
- Do not operate an outboard with an overheating condition or suspected cooling-system failure.
- Use the engine service manual for removal procedures, torque specifications, and testing requirements.
- This is an aftermarket replacement component, not an OEM Mercury Marine part.
- Professional installation is recommended when the correct procedure or fitment is uncertain.
About Sea Sierra
- Marine Replacement Parts — Replacement components selected for common marine service applications.
- Application-Focused Listings — Product references and fitment information are provided to help with part comparison.
- Customer Support — Contact support with your engine model, serial number, and original part information when fitment assistance is needed.
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