Re: Electromatic clutch freewheeling?

Posted by HH56 On 2022/10/20 15:49:06

Depends on conditions or speed the car was going but it is possible the clutch disengaged. If the car was going below the overdrive engagement speed of approximately 20-25mph the governor would have the AD contact disconnected and EC contact going to ground. As soon as the accelerator was completely released the accelerator switch would have made contact and with the governor also making contact the Electromatic Clutch on/off solenoid would get ground and turn on to allow vacuum into the system. With the accelerator relaxed and vacuum available the control valve would disengage the clutch. If the car was going faster than 25 the EC should still be inactive electrically unless the gear shift lever was moved. As soon as the lever is moved from third another switch is made to admit vacuum and irregardless of speed, if the accelerator is in the right position EC could have been made active.

If the car has overdrive and that was engaged it is possible the overdrive and the probability it went into freewheeling was the actual culprit to disconnect from the engine.

Packard recommended locking out both EC and OD when under certain conditions including when descending a hill.

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