CARBBIA 160°F Thermostat Kit for Mercruiser/GM 4.3L–8.2L — Includes Plastic Sleeve & Gaskets

CARBBIA 807252Q5 is a complete 160°F thermostat kit designed to replace Mercruiser and GM original equipment on 1987 and newer V6 and V8 marine engines. This kit supplies a 160-degree thermostat plus all necessary gaskets and a plastic sleeve to restore reliable temperature regulation in Mercruiser-compatible engines. Replacing a worn thermostat and seals improves coolant flow control and helps prevent overheating or erratic temperature readings caused by degraded parts. The CARBBIA kit matches common OEM part numbers so it fits a wide range of Mercruiser and GM marine applications from 4.3L through 8.2L.

Which engines and years will this thermostat kit fit?

The CARBBIA 807252Q5 kit is made for 1987 and later GM-based marine engines used by Mercruiser, covering both V6 and V8 displacements. It references multiple OEM part numbers so you can cross-check fitment before ordering.

• Compatible with Mercruiser V6 & V8: 4.3L, 5.0L, 5.7L, 7.4L, 8.2L (1987-up).
• Matches Merc part numbers: 807252Q5 and 808252 equivalence.
• Cross-references GLM 13101 and Sierra 18-3647 (note: Sierra version lacks plastic sleeve).

What parts are included and why each matters?

This kit contains the thermostat, a protective plastic sleeve, and multiple gaskets for the housing and cover so you replace every sealing surface at once. Installing all components together reduces the chance of coolant leaks and ensures the thermostat sits correctly for accurate temperature control.

• 160°F thermostat — controls coolant flow at the designed operating temperature.
• Plastic sleeve — supports the thermostat valve and protects the housing bore.
• Multiple cover and housing gaskets — ensure leak-free seals on reassembly.

How does this CARBBIA kit compare to OEM or single-part replacements?

Unlike buying a thermostat alone, this kit supplies the gaskets and sleeve you’ll likely need during a service, saving a follow-up repair. It’s manufactured to match OEM reference numbers so fit and function align with original equipment expectations.

• Full-kit convenience prevents mismatched seals or missing sleeve issues.
• OEM cross-reference numbers simplify verification for mechanics and DIYers.
• Designed for standard cooling systems used in Mercruiser/GM marine engines.

What should I check before installing this kit?

Confirm engine model, year, and displacement against the listed fitment to avoid ordering errors. Inspect the housing bore and mating surfaces for corrosion or damage; replacing the thermostat and gaskets won’t seal a warped or cracked cover.

• Verify engine is a GM-based Mercruiser 1987 or newer model in the listed sizes.
• Clean and inspect thermostat housing and cover surfaces prior to installation.
• Replace any damaged bolts, clips, or corroded parts that would affect sealing.

Who is this for: This CARBBIA thermostat kit is intended for boat owners, marine mechanics, and weekend DIYers who need a direct-fit replacement for Mercruiser-compatible GM engines from 4.3L through 8.2L. It’s useful when performing routine cooling-system service or troubleshooting temperature control issues, and for anyone who prefers a complete OEM-referenced kit that includes the thermostat, sleeve, and all gaskets to ensure a proper, leak-free installation.

FAQ

Q: Does this kit fit a 1995 Mercruiser 5.7L?

A: Yes. The CARBBIA 807252Q5 kit fits Mercruiser 5.7L GM-based engines from 1987 and newer.

Q: Is the plastic sleeve included with every kit?

A: Yes. This CARBBIA kit includes a plastic sleeve; note that some cross-reference Sierra part numbers may omit it.