Mechanical torque converter valves

The first fan keeps rotating. On the same principle the torque converter works. In that the impeller or pump acts as first fan which is connected to the engine and turbine act as the second fan which is connected to the transmission system. When the engine runs, it rotates the impeller and due to the centrifugal force the oil inside the torque converter assembly directed towards the turbine.

As it hits turbine blades, the turbine starts rotating. This makes the transmission system rotate and the wheels of the vehicle moves. When engine stops, the turbine also stops rotating but the impeller connected the engine keeps moving and this prevent the killing of engine. The impeller is connected to the housing and the housing connected to the engine shaft. It has curved and angled vanes. It rotates with the engine speed and consists of automatic transmission fluid.

When it rotates with the engine, the centrifugal force makes the fluid move outward. The blades of the impeller are designed in such a way that it directs the fluid towards the turbine blades. It acts as centrifugal pump which sucks the fluid from the automatic transmission and delivers it to the turbine. The stator is located in between the impeller and turbine.

The main function of the stator is to give direction to the returning fluid from the turbine, so that the fluid enters to the impeller in the direction of its rotation. As the fluid enters in the direction of the impeller, it multiplies the torque. So stator helps in the torque multiplication by changing the direction of the fluid and allows it to enter in the direction of the impeller rotation. The stator changes the direction of fluid almost upto 90 degree. The speed-sensitive governing devices control shifting operations, and dynamically change the valve position to govern the flow of hydraulic fluid.

The gear change and shift are achieved by neutralizing the torque with hydraulically engaged bands and multiple-disk clutches. The entire transmission control units are interlinked amongst each other and placed inside an emission control system; which is used to regulate the ratio of air to fuel ratio and engine timings.

Torque converter clutch acts as a connecting medium between the transmission input and engine output. It empowers the user to minimize the temperature of the transmission fluid and increase the fuel mileage of units. The major drawback is transmission slipping. Either increase or decrease in transmission fluid results in gear slipping, thus reducing the overall efficiency of the system. Other negative signs include damaged clutches and seals, shuddering effects, overheating, and fuel contamination.

Yes, and the easy process to diagnose torque converter is through the stall test. In this process, the torque converter has to be firmly placed at a single position, and extreme pressure is to be applied on braking to gain control over the machine and apply high pressure to the throttle pedal for two to three seconds. Measure the stall speed at that instance and compare it with the manufacturer datasheet.

Yes, it is the generic scenario perceived during torque converter break-down or damaged cases. This converter is found to be highly efficient in heavy-duty equipment with higher stall speed. Some extremely popular vehicles such as the Cavalier and the Grand Am also use this transmission. When the torque converter clutch malfunctions, it will apply and stay stuck in the applied position. This can cause a stalling and bucking condition when the vehicle is slowing down or stopping.

The torque converter clutch is supposed disengage when you step on the brake pedal. When people would complain about torque converter clutch problems and the C was installed we ran a quick test. Mechanics would disconnect the four wire connector from the torque converter clutch solenoid. This was not a scientific test and if the solenoid was permanently stuck applied it would not tell you what was wrong with the car. But often simply disconnecting the clutch solenoid connector solved the shuddering or stalling condition.

The torque converter clutch would no longer apply and the vehicle would get extremely poor fuel economy. Some customers would try to avoid the repair which includes replacing the torque converter clutch solenoid. This part mounts in the valve body.

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