SIERRA MerCruiser V6/V8 Thermostat Housing – 18-1977-1

Description

SIERRA MerCruiser V6/V8 Thermostat Housing – 18-1977-1

A cast cooling-system thermostat housing that distributes engine cooling water to the appropriate manifold/exhaust circuits on compatible MerCruiser inboard and sterndrive engines.

• Application: Selected MCM/MIE GM V6/V8 305/350 and high-performance 454/502/540 applications using the 47441-series thermostat housing.
• Component/function: Thermostat housing
• Key specification: System: Engine cooling-water distribution
• OEM / aftermarket cross-reference: Barr: MC2947441; GLM: 13220; Mallory: 9-42503, 9-42506; MerCruiser: 47441, 47441A1; OSCO: MC55-TSB
• Use the applicable OEM service procedure and inspect mating components during installation.

This is an application-specific marine service part. Confirm the engine or sterndrive model, serial range and OEM reference before installation.

Application: Selected MCM/MIE GM V6/V8 305/350 and high-performance 454/502/540 applications using the 47441-series thermostat housing.

Specifications

• Component: Thermostat housing
• System: Engine cooling-water distribution
• Engine family: Selected GM V6/V8 marine engines

Interchange / Replaces

• Barr: MC2947441
• GLM: 13220
• Mallory: 9-42503, 9-42506
• MerCruiser: 47441, 47441A1
• OSCO: MC55-TSB