What is the purpose of a lock up torque converter?

A lockup torque converter is important in automatic transmissions to reduce slippage. And once slippage is curbed, heat generation is minimal while fuel economy is improved.

What does a lock up clutch do?

The lock up clutch is installed on the turbine hub, in front of the turbine. The dampening spring absorbs the torsional force upon clutch engagement to prevent shock transfer. The friction material bonded to the lock up piston is the same as that used on the multiplate clutch discs in the transmission.

What happens when the torque converter doesn’t lock up?

Vehicles with a non releasing one way clutch will accelerate normally but at a decreased top speed. The failure results in a 30 to 50\% reduction in mpg. Top cruising speeds are lowered to 40 or 50 mph. The transmission may shift normally even when the one-way torque converter clutch slips or fails to release properly!

Can a bad torque converter lock up an engine?

There are basically three ways a torque converter lockup clutch can fail: It can stay locked up, stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant …

What is a transmission lock-up?

Torque converter lock-up is engaged through a solenoid mounted inside the transmission. This clutch acts just like a clutch disc in a manual transmission application. When the converter is “locked up” this clutch is forced against the front of the converter creating a direct drive from engine to transmission.

How do I test my torque converter lock up?

Testing for Bad Torque Converters Turn the ignition key and start up the engine. Wait for a few minutes for the engine to warm up, then gently press the accelerator twice and rev up the engine. Once it returns to its idle state, press the brake pedal all the way and shift into drive.

What happens when the converter locks up?

When the converter is “locked” it is just like a direct drive manual clutch system allowing the stress to be taken off the fluid coupling and placed under full mechanical load. When the converter is “locked up” this clutch is forced against the front of the converter creating a direct drive from engine to transmission.

What causes torque converter failure?

Many torque converter failures can be caused by excessive friction, which means the torque converter’s needle bearings are damaged. Also, a faulty seals or faulty clutch solenoid can be to blame. A faulty seal can allow fluid to leak and become contaminated. A bad torque converter can damage a transmission.

How can you tell if your transmission is locked up?

Transmission Trouble: 10 Warning Signs You Need Repair

1. Refusal to Switch Gears. If your vehicle refuses or struggles to change gears, you’re more than likely facing a problem with your transmission system.
2. Burning Smell.
3. Neutral Noises.
4. Slipping Gears.
5. Dragging Clutch.
6. Leaking Fluid.
7. Check Engine Light.
8. Grinding or Shaking.

What are signs of a bad torque converter?

Symptoms of Torque Converter Problems

1. Slipping. A torque converter can slip out of gear or delay a shift its fin or bearing is damaged.
2. Overheating.
3. Contaminated Transmission Fluid.
4. Shuddering.
5. Increased Stall Speed.
6. Unusual Sounds.