Mercury 991551 | Quicksilver Marine Boat Replacement Thermostat

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Thermostat 991551 is for 1998 and newer MerCruiser marinized V6 and V8 engines made by General Motors using closed cooling systems and requiring the use of the 160°F thermostat.Pro duct Details Manufacturer part number: 991551 160°F thermostat Easy to replace with common tools See your owner's manual for removal of non-functioning thermostat and replacement of new thermostat Thermostat 160° F is compatible with 1998 and newer MerCruiser V6 and V8 engines. Show more