doietc Thermostat with Housing Kit for Mercury 65–150 HP Outboards — OE Fit, Leak-Resistant

doietc 892864T06 thermostat with housing is a direct-fit replacement that regulates coolant flow to help maintain stable operating temperatures in compatible Mercury 4-stroke outboard engines.

This complete thermostat-and-housing kit is engineered as a straightforward swap for worn or failing temperature regulators on a wide range of Mercury outboards. It replaces OE numbers 892864T06, 8M0090819 and 892864A06 and fits many 65–150 HP 4-stroke models, offering OEM-style fitment and a heavy-duty sealing design backed by factory testing and a one-year warranty.

Which Mercury outboard models will this kit fit?

The kit covers multiple Mercury 4-stroke models across the 65 to 150 horsepower range, including EFI and jet variants as listed by the manufacturer. Confirm your engine’s part number or existing thermostat OE reference to ensure compatibility before ordering.

• Compatible with 65 HP, 75 HP, 80 HP, 90 HP, 100 HP, 115 HP, 135 HP and 150 HP 4-stroke Mercury outboards
• Covers EFI, JET, SEAPRO and PRO XS variants where specified
• Direct replacement for OE# 892864T06, 8M0090819, 892864A06

How does this thermostat housing kit control engine temperature?

The thermostat element opens and closes in response to coolant temperature, directing flow through the engine cooling passages and radiator as needed. A precise valve action helps reduce overheating, minimizes temperature swings and improves gauge stability without altering engine tuning.

• High-precision thermostat valve for consistent temperature regulation
• Sealing components and high-tensile springs prevent leaks under pressure
• Reduces erratic coolant temperature readings and helps maintain optimal operating range

What materials and build quality can I expect from this replacement?

The kit combines durable plastics and elastomer seals with reinforced springs to withstand marine conditions and thermal cycling. Each unit is 100% tested before shipment to ensure proper operation and leak-free performance out of the box.

• Robust plastic housing resistant to corrosion and vibration
• Elastomeric seals designed for repeated thermal expansion and contraction
• High-tensile springs to preserve valve tension and longevity

What support and warranty come with the thermostat kit?

doietc inspects every kit prior to dispatch and includes a one-year warranty against manufacturing defects. If you encounter fit, function or quality issues, contact customer support for troubleshooting or replacement guidance.

• 100% tested and inspected units before delivery
• One-year warranty for manufacturing or workmanship defects
• Dedicated support for installation questions and warranty claims

Who is this for: This thermostat with housing kit is intended for boat owners, marine mechanics and fleet operators who need a reliable, direct replacement for failing Mercury outboard thermostats on 65–150 HP 4-stroke engines. It’s suitable for routine maintenance, mid-season repairs or preparing a vessel for heavy use where stable engine temperatures and leak-free performance are essential.