Mercury – Thermostat Kit | Cooling System | V6 135–200HP Outboards | 75692T2

Overview

When an outboard runs too hot or too cold, you feel it — sluggish throttle, uneven idle, maybe even a warning beep you don’t want to hear. The Mercury Marine 75692T2 Thermostat Kit helps bring your engine’s temperature back where it should be. It’s made for Mercury and Mariner V6 135–200HP outboards (except DFI and OptiMax models) and includes two thermostats and two rubber gaskets — one for each bank. Built to Mercury’s original specs, these thermostats open exactly when they should, keeping your engine running smooth, efficient, and worry-free.

Key Features

• Purpose: Keeps your outboard’s temperature steady for better performance and longer life.
• Contents: Includes two thermostats and two rubber gaskets for both cylinder banks.
• Design: Built from marine-grade metals and rubber that stand up to salt, heat, and pressure.
• Performance: Helps your motor warm up quickly and hold temperature under load.
• Durability: Made to handle years of vibration, water exposure, and seasonal use.
• Ease of Use: Installs easily with standard tools — no special setup required.

Engine & Boat Compatibility

• Mercury / Mariner V6 outboards:
• 135–150HP (serial No. A904646 and newer)
• 175HP (serial No. 100861 and newer)
• 200HP (serial No. 6435503 and newer)
• Not compatible with DFI or OptiMax models

Performance & Real-World Benefits

The 75692T2 kit keeps your outboard’s cooling system balanced, so both sides of the V6 engine stay in sync. When thermostats age, they can stick open or closed, throwing off temperature and hurting performance. Replacing them restores even cooling and keeps your engine working efficiently from idle to wide-open throttle.

You’ll notice smoother idle, better throttle response, and consistent running temperature — the kind of difference you can feel every time you take the boat out.

Why Choose Mercury OEM

Mercury built these thermostats to handle exactly what marine engines go through: heat, salt, and constant vibration. Cheaper parts might fit, but they rarely last as long or open as precisely.

With the Mercury 75692T2 kit, you get factory-calibrated thermostats that hold their accuracy season after season. They’re tested for real-world use and built to keep your cooling system doing its job quietly in the background — so you can focus on the ride, not the temperature gauge.

FAQ

Q1: What’s included in the kit?
Two thermostats and two rubber gaskets — one for each side of your V6.

Q2: What engines does this fit?
It fits Mercury and Mariner 135–200HP V6 outboards (non-DFI, non-OptiMax).

Q3: Why replace both thermostats?
Replacing both ensures even cooling across the engine — no hot or cold spots.

Q4: How often should they be replaced?
Inspect them every season and replace them every few years or if temps start fluctuating.

Q5: Why OEM instead of aftermarket?
Mercury OEM parts are calibrated for your specific engine — they fit right, last longer, and keep temps exactly where they should be.