Torque Converter Check Valve: Description and Operation
VALVE-TORQUE CONVERTER DRAINBACKDESCRIPTION
GAS ENGINES
The drainback valve is located in the transmission cooler outlet (pressure) line.
DIESEL ENGINE
The converter drainback check valve is located in the in the TOC pressure - supply line, between the engine mounted TOC and the air to oil TOC.
OPERATION
GAS ENGINES
The valve prevents fluid from draining from the converter into the cooler and lines when the vehicle is shut down for lengthy periods. Production valves have a hose nipple at one end, while the opposite end is threaded for a flare fitting. All valves have an arrow (or similar mark) to indicate direction of flow through the valve.
DIESEL ENGINE
The valve prevents fluid from draining from the converter into the cooler and lines when the vehicle is shut down for lengthy periods. Production valves have pipe thread on one end, while the opposite end is threaded for a flare fitting, and are threaded into the oil cooler mounted on the side of the engine. All valves have an arrow (or similar mark) to indicate direction of flow through the valve.