Just a bit of helpful information. I replaced my choke thermostat yesterday. Why? It did not function, choke never opened. It was probably submerged, was definetly corroded. I hooked it up multiple times (no movement), tested it with an ohm meter (no continuity).
My thermostat was an electric type, on the 2 barrel carburetor (Mercarb) for my Merc 165 (3.7L). I replaced it with one from Napa auto (part number 30076), but they can be found at any auto parts store. I referenced a 1984 Chevrolet C-10 with a 305ci motor. The thermostat is common, not any cheaper, but was on the shelf and works great. It can possibly be said that if the choke thermostat looks the same, fits, and has the same winding direction, it will work.
Just in case no one knows how an electric, automatic, choke works, here is a quick rundown. The choke thermostat is a system comprised of a bi-metal coil that expands and unwinds as it is heated, and a resistive heater that heats the coil. This unit operates completely separate of the motor, and the choke opens at a set rate regardless of the temperature of the engine. If the choke thermostat fails, the choke will not open and the motor will run very poorly when at temp. There are some carbs that have a linked vacuum tube that helps the choke open when the engine is running, but mine did not have this function.
Brandon
My thermostat was an electric type, on the 2 barrel carburetor (Mercarb) for my Merc 165 (3.7L). I replaced it with one from Napa auto (part number 30076), but they can be found at any auto parts store. I referenced a 1984 Chevrolet C-10 with a 305ci motor. The thermostat is common, not any cheaper, but was on the shelf and works great. It can possibly be said that if the choke thermostat looks the same, fits, and has the same winding direction, it will work.
Just in case no one knows how an electric, automatic, choke works, here is a quick rundown. The choke thermostat is a system comprised of a bi-metal coil that expands and unwinds as it is heated, and a resistive heater that heats the coil. This unit operates completely separate of the motor, and the choke opens at a set rate regardless of the temperature of the engine. If the choke thermostat fails, the choke will not open and the motor will run very poorly when at temp. There are some carbs that have a linked vacuum tube that helps the choke open when the engine is running, but mine did not have this function.
Brandon
