Sierra 18-3668 Thermostat Kit for MerCruiser
- Brand:
- Sierra
- Part no:
- 18-3668
Where to buy
View on Amazonpaid link
Sierra sells this as a thermostat kit for MerCruiser engines, under part number 18-3668. It replaces 807252T4 and 807252Q4, so those older numbers are the ones to look for on your existing part. No opening temperature or other specification is given, so confirm the temperature rating you need before fitting it, and check your engine's application with Sierra.
Our take
The 18-3668 kit replaces 807252T4 and 807252Q4, which gives you two original numbers to cross-check against the part on your MerCruiser. No opening temperature is stated, so check that against your engine's spec.