Sierra Thermostat Kit 18-3668D for MerCruiser
- Brand:
- Sierra
- Part no:
- 18-3668D
Where to buy
View on Amazonpaid link
Sierra 18-3668D is a thermostat kit for MerCruiser, with its name also referencing #807252Q 4. It replaces 807252T4 and 807252Q4. No opening temperature or engine list is stated, so use the replacement numbers to cross-check against the thermostat kit already on your engine before fitting it.
Our take
The numbers 807252T4 and 807252Q4 that the 18-3668D replaces are the only fitment reference given, so match them against your existing kit. No opening temperature is stated, so compare that with your original thermostat too.