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Add to CartReplacement thermostat housing 8M0174561 is for Mercury Verado outboards 135-200hp (4-cylinder engines serial No. 1B311420 and above), 200-300hp (6-cylinder engines serial No. 1B390143 to 2B144127, prior to Gen V), 200-300hp (6-cylinder engines serial No. 2B144123 and above, Gen V) and 350-400hp (6-cylinder engines). Includes the thermostat. The thermostat housing is made of corrosion resistant, high temperature, molded, composite material to deliver increased service life.
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What is the Mercury-MerCruiser 8M0174561 Thermostat Assy used for?
The Mercury-MerCruiser 8M0174561 Thermostat Assy is a replacement thermostat housing with an included thermostat for select 135 hp through 400 hp Mercury 4-stroke Verado outboards. The housing uses corrosion-resistant, high-temperature molded composite material and incorporates a 90-degree bend on the outflow side.
Which Mercury Verado outboards does the 8M0174561 thermostat assembly fit?
The 8M0174561 fits select Mercury 135 hp through 400 hp 4-stroke Verado outboards, including specified 4-cylinder and 6-cylinder applications. Coverage includes 135, 150, 175, 200, 225, 250, 275, 300, 350, and 400 hp models listed in the product description. Verify your exact engine application and serial number before ordering.
What thermostat temperature is the Mercury 8M0174561 Thermostat Assy?
The Mercury-MerCruiser 8M0174561 is identified as a 140-degree replacement thermostat housing assembly. The housing includes an internal stainless steel thermostat and is designed for the select Mercury Verado outboard applications specified in the product description.
What is included with the Mercury-MerCruiser 8M0174561 Thermostat Assy?
The 8M0174561 assembly includes the thermostat within the replacement thermostat housing. The housing is made from molded, corrosion-resistant, high-temperature composite material and features a 90-degree bend on the outflow side.
What serial numbers are supported by the Mercury 8M0174561 thermostat housing?
The specified applications include 135-200 hp 4-cylinder Verado engines with serial number 1B311420 and above; 200-300 hp 6-cylinder engines with serial numbers 1B390143 to 2B144127 prior to Gen V; and 200-300 hp 6-cylinder Gen V engines with serial number 2B144123 and above. The description also lists 350-400 hp 6-cylinder applications.
What parts does the Mercury-MerCruiser 8M0174561 Thermostat Assy replace?
The Mercury-MerCruiser 8M0174561 Thermostat Assy replaces Mercury part number 892864T04 and Sierra part number 18-3631. Verify the part number and your engine's application and serial number before using this thermostat housing as a replacement.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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