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It comes with the thermostat pre-installed in the housing
There are typically two: an upper (vent) and a lower (drain)
18-3673 Johnson/Evinrude V4 Crossflow 110 2-Stroke 1985-1989 340975
Brand Rated HP Stroke Serial Number Range Mercury 3
Serpentine Belt Idler Pulley – Fits Volvo Penta 4.3/5.0/5.7/8.1L Marine Engines (Replaces 3861009) family-yamaha-8ld It comes with the thermostatSerpentine Belt Idler Pulley Fits Volvo Penta 4. 3 5. 0 5. 7 8. 1L Marine Engines (Replaces 3861009) This serpentine belt idler pulley is designed for a precise fit on a range of Volvo Penta gasoline marine engines from 19992012, including the 4. 3L, 5. 0L, 5. 7L, and 8. 1L models (GXi, Gi, GXiE, and OSi OSXi variants). It serves as a direct replacement for Volvo Penta part number 3861009, ensuring proper belt tension and smooth engine operation.