Sierra 18-3667 Thermostat Kit, 160 degree
- Brand:
- Sierra
- Part no:
- 18-3667
Where to buy
View on Amazonpaid link
The Sierra 18-3667 is a 160 degree thermostat kit for Mercruiser engines. It includes thermostat 18-2555 and gasket 18-3555. It replaces OEM 27-89656-1 for the gasket and 99155A-1 for the thermostat.
Our take
The 18-3667 pairs thermostat 18-2555 with gasket 18-3555, so the seal is covered in the same kit. It is a 160 degree unit, so check that rating suits your Mercruiser.