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Troubleshooting Manual Transmission Clutch Problems

A smooth and gradual transfer of power and torque is accomplished using a clutch friction unit to engage and disengage the power flow. A transmission is used to vary the gear ratio for the best speed and power, and to provide for vehicle movement under the different conditions of starting, stopping, accelerating, maintaining speed and reversing. The various components necessary to deliver power to the drive wheels are the flywheel, pressure plate, clutch plate, release bearing, control linkages and the transmission.

When the clutch and pressure plates are locked together by friction, the clutch shaft rotates with the engine crankshaft.

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The clutch in a car or vehicle provides a smooth transfer of power and torque to engage and disengage the power flow from the engine to the wheels, while a manual. Overall manual transmission problems in my opinion are less common than problems with automatic transmissions. In fact the problems I have seen in most manual.

Troubleshooting Manual Transmission Clutch Problems

Power is transferred from the engine to the transmission, where it is routed through different gear ratios to obtain the best speed and power to start and keep the vehicle moving.

The flywheel

The pressure plate

The pressure plate consists of a heavy metal plate, coil springs or a diaphragm spring, release levers (fingers), and a cover.

When coil springs are used, they are evenly spaced around the metal plate and located between the plate and the metal cover.

This places an even pressure against the plate, which in turn presses the clutch plate tight against the flywheel. The cover is bolted tightly to the flywheel and the metal plate is movable, due to internal linkages.

The coil springs are arranged to exert direct or indirect tension on the metal plate, depending upon the manufacturer's design. Three release levers (fingers), evenly spaced around the cover, are used on most pressure plates to release the holding pressure of the springs on the clutch plate, allowing it to disengage the power flow.

When a diaphragm spring is used instead of coil springs, the internal linkage is necessarily different to provide an . Its operation can be compared to the operation of an oilcan. When depressing the slightly curved metal on the bottom of the can, it goes over- center and gives out a loud .

A click is not heard in the clutch operation, but the action of the diaphragm spring is the same as the oil can.

The clutch plate

The release bearing

The release (throw out) bearing is usually a ball bearing unit, mounted on a sleeve, and attached to the release or throwout lever. Its purpose is to apply pressure to the diaphragm spring or the release levers in the pressure plate.

We will answer your question by email, and post the question and answer here for anyone else. We will start with a possible cause that would not require transmission removal. If the car shifts from first to second, and then stays in second, never shifting to third or OD it may have a number 2 shift solenoid that is failing to activate, or failing to seal when activated. This could be caused by a defective solenoid, wiring problem, or bad processor. If you have had any recent electrical problems one of the above problems is more likely.

This same condition could also be caused by a stuck 1- 2 shift solenoid in the valve body. We also offer an upgraded version of this shaft. A bad output shaft speed sensor could also cause erratic shifting, but these rarely fail.

I am experiencing chatter or shudder in 3rd gear at 3. Locking out overdrive with the button does not help. I am thinking torque convertor clutch slippage, but I don't know if this is a centrifugal or electrical lockup. What do you think is the cause?

The converter clutch is electronically controlled in this transmission.

The best way to verify that the problem is with the converter clutch is to maintain your throttle position, and lightly touch the brake while the shudder is occuring. This lack of engine braking will make first or second feel like neutral if the vehicle speed is high enough. Do I have to buy something else to resolve my snag??

I've set the throttle body like they said on the instruction. There is also a plate that Ford made to go between the idle air motor and the throttle body. Most of the time the o/d off light will flash. I beleive the code is for a 1- 2 shift error. I checked the 1- 2 accumulator springs and they were not broken, what else could be wrong?

You could have excessive slippage on your intermediate clutch pack, or a problem with your shift solenoids.

Transmission Troubleshooting Tips & Repair The first thing you should do when you suspect any transmission problem is to check.