DABAZUALY Thermostat Kit for MerCruiser GM 4.3L–8.2L (1987–2016) — 160° Thermostat, Sleeve & Gaskets

The DABAZUALY 160° Thermostat Kit is a complete replacement set for MerCruiser GM V6 and V8 inboard/outdrive engines (4.3L–8.2L) that restores correct engine temperature control with a new thermostat, sleeve and multiple gaskets.

This kit provides everything needed to renew the thermostat assembly on MerCruiser-powered boats from 1987 to 2016. It’s built to replace common OEM part numbers (including 807252Q5 and Sierra 18-3647) and contains a 160° thermostat plus a plastic sleeve and several cover and housing gaskets. Use it when servicing the cooling system, rebuilding the thermostat housing, or replacing worn seals to help reduce leaks and restore proper coolant flow.

Which engines and model years does this kit fit?

This thermostat kit is designed for MerCruiser GM V6 and V8 engines used in inboard and outdrive configurations from 1987 through 2016. It covers common displacements including 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L. Check your engine’s OEM part numbers to confirm compatibility before ordering.

• Fits MerCruiser V6 & V8 GM 4.3L–8.2L (1987–2016)
• Replaces Merc part numbers such as 807252Q5 and 808252 (thermostat)
• Cross-references GLM 13101 and Sierra 18-3647 (note Sierra part lacks sleeve)

What components are included and why they matter?

The kit contains a 160° thermostat, a plastic housing sleeve, and multiple gaskets to fully reseal the thermostat housing during service. Having correct gaskets and the sleeve on hand prevents repeat disassembly and ensures a reliable seal between mating surfaces. The 160° thermostat is a common standard for these marine GM engines and helps maintain intended operating temperature under normal loads.

• 1 × 160° thermostat (replaces MerCruiser 808252)
• 1 × plastic housing sleeve (replaces MerCruiser 23-806922)
• Several cover and housing gaskets to replace worn seals

How will installing this kit help my boat’s cooling system?

Replacing the thermostat, sleeve, and gaskets restores proper coolant routing and reduces the chance of leaks at the housing. A fresh thermostat opens at the rated 160° to allow coolant flow only when the engine reaches operating temperature, helping the engine reach and maintain designed thermal conditions. New gaskets ensure a tight seal, preventing seepage and loss of coolant that can lead to overheating or inefficient operation.

• Restores correct thermostat opening temperature (160°)
• Prevents leaks with all necessary gaskets included
• Plastic sleeve protects housing bore and eases thermostat removal

Is this a direct OEM replacement and what part numbers match?

This DABAZUALY kit is built to replace commonly used OEM numbers so it functions as a direct service replacement in most applications listed. It cross-references MerCruiser part numbers such as 807252Q5 and the thermostat 808252, plus Sierra 18-3647 and GLM 13101 for equivalent coverage. Always verify the part numbers stamped on your existing components to confirm a direct match.

• Replaces MerCruiser 807252Q5, 808252 and related gasket/sleeve parts
• Cross-reference: Sierra 18-3647, GLM 13101 (Sierra set may omit sleeve)
• Intended for standard cooling setups on specified GM engines

Who is this for: This kit is aimed at marine mechanics, do-it-yourself boat owners, and service shops working on MerCruiser GM V6 and V8 inboard/outdrive engines from 1987 to 2016. It’s especially useful when replacing a failing thermostat, repairing a leaking housing, or performing routine cooling system maintenance where OEM-equivalent parts and a full gasket set are needed. If you discover fitment or quality issues, DABAZUALY provides options for replacement or refund under warranty.