Re: Windshield wiper mystery - 1956 Clipper De Luxe
Posted by HH56 On 2012/8/5 8:58:05
Correct, the lever activates a mechanism to change the port selection inside the motor. That directs vacuum in such a way the blade travel is reduced. Less time needed for the shorter sweep to complete equals a higher "speed". The true actual speed control is via the regular knob. The amount knob is turned moves the main slide valve to control the amount of vacuum to the motor.
If yours isn't going into high speed check the vacuum at the small tube at center of motor. When lever is off or in left position there should be no vacuum. When lever is vertical you should feel regular vacuum which would then activate the mechanism. If the small tubes are reversed, that could be one cause as would be a bad tube -- although you should be hearing a vacuum leak at the switch or at the break in those situations. If all seems well, then the motor most likely needs some attention.
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If yours isn't going into high speed check the vacuum at the small tube at center of motor. When lever is off or in left position there should be no vacuum. When lever is vertical you should feel regular vacuum which would then activate the mechanism. If the small tubes are reversed, that could be one cause as would be a bad tube -- although you should be hearing a vacuum leak at the switch or at the break in those situations. If all seems well, then the motor most likely needs some attention.
Attach file:
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