UANOFCN MerCruiser Thermostat Kit for GM V6 & V8 160°F – 4.3L–8.2L 1987–2016, complete sleeve & gaskets

UANOFCN 807252Q5 is a complete thermostat replacement kit for MerCruiser GM V6 and V8 inboard/outdrive engines (4.3L–8.2L) that includes a 160°F thermostat, sleeve, and all gaskets for direct fit.

This kit is designed to restore correct engine cooling control on MerCruiser-equipped boats built between 1987 and 2016. It replaces multiple OEM part numbers (807252Q5, 807252T8, Sierra 18-3647, GLM 13101, Mallory 9-43157) and contains the thermostat, housing sleeve and five gaskets so you can complete the job without sourcing additional parts. The 160°F (approximately 71°C) thermostat helps the engine reach and maintain operating temperature under typical marine conditions.

Which MerCruiser engines and model years does this kit fit?

This UANOFCN kit fits a broad range of MerCruiser GM V6 and V8 engines used in inboard and stern drive applications from 1987 through 2016. It specifically covers 4.3L, 5.0L, 5.7L, 7.4L and 8.2L displacements.

• Compatible engines: MerCruiser V-6 and V-8 GM inboard/outdrive
• Displacements supported: 4.3L, 5.0L, 5.7L, 7.4L, 8.2L
• Covered years: 1987–2016
• Replaces common OEM numbers for easy cross-referencing

What exactly is included in the thermostat kit?

The kit supplies everything needed for the thermostat service location: the 160°F thermostat, a plastic housing sleeve, and multiple gaskets to ensure a leak-free installation. Parts supplied match factory replacement items so you won’t have to hunt for additional seals or components.

• 1 × MerCruiser 160°F thermostat (807252T2)
• 1 × Thermostat housing sleeve (23-806922)
• Gaskets included: 27-48818-1, 27-33179-2, 27-47510, 27-53045-1
• Compatible with OEM cross-reference numbers listed on product listing

How does this kit simplify installation and maintenance?

By delivering the thermostat and all required gaskets plus the plastic sleeve in one package, the kit reduces downtime and avoids multiple parts orders. The sleeve guides correct seating of the thermostat and the matched gaskets help prevent coolant leaks when reassembling the housing.

• Single-package solution saves time and reduces risk of missing parts
• Plastic sleeve helps ensure proper thermostat alignment
• Multiple gaskets eliminate guesswork and lower leak risk
• Direct-fit parts match common MerCruiser replacement numbers

Do I need to check compatibility before ordering?

Yes—verify your MerCruiser engine model, serial number and year before purchase to confirm fit. If you’re unsure of the exact part you need, contact the seller with your engine details and they can help confirm compatibility.

• Check engine serial number and model year against listing
• Compare OEM part numbers if available
• Contact seller for fitment help if uncertain
• Proper fit reduces risk of premature failure or leaks

Who is this for: This UANOFCN thermostat kit is aimed at boat owners, marine mechanics and restoration shops working on MerCruiser GM V6 and V8 inboard or stern drive engines built between 1987 and 2016. It’s ideal for anyone performing routine cooling system service or replacing a worn thermostat and seals during engine maintenance or repower projects. If you maintain MerCruiser 4.3L through 8.2L engines and want a single-kit solution that includes the thermostat, sleeve and required gaskets, this product streamlines the repair and helps ensure a proper seal and fit.