Thermostat Kit w Sleeve for MerCruiser V6 V8 4.3 50 5.7 7.4 8.2 - 807252Q4

Thermostat Kit with Sleeve for MerCruiser

This thermostat kit with sleeve is a direct replacement cooling system component for MerCruiser V6 and V8 marine engines, featuring OEM cross-reference number 807252Q4.

Overview

This thermostat kit with sleeve is designed to regulate engine coolant temperature in MerCruiser V6 and V8 marine engines. It includes the thermostat, gasket, and sleeve for a complete cooling system service on models such as 4.3, 5.0, 5.7, 7.4, and 8.2L.

Built For Performance

• Includes a high-temperature thermostat that opens at the correct factory setting
• Supplied with a precision-machined sleeve for proper coolant flow
• Includes a high-quality gasket to prevent leaks
• Manufactured to meet or exceed OEM specifications for reliable operation
• Direct fit for multiple MerCruiser engine families

Fits These Machines

• for MerCruiser 4.3L V6
• for MerCruiser 5.0L V8
• for MerCruiser 5.7L V8
• for MerCruiser 7.4L V8
• for MerCruiser 8.2L V8

On-The-Job Use

• Replaces a failed or stuck thermostat in marine engines to prevent overheating
• Used during routine cooling system maintenance on inboard and sterndrive boats
• Restores proper engine warm-up and fuel efficiency on MerCruiser-powered vessels
• Ideal for saltwater and freshwater applications to maintain temperature control

Specs At A Glance

Good To Know

Q: Is the thermostat pre-set or adjustable? A: This thermostat is factory-calibrated to open at the correct temperature for MerCruiser engines (typically 160°F or 180°F depending on model) and is not adjustable.

Q: Do I need to replace the sleeve with the thermostat? A: Yes, the sleeve is included because it can wear or corrode over time; replacing it ensures proper coolant flow and a secure seal.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.