Re: windshield wipers
Posted by HH56 On 2014/11/22 16:24:44
If I understand you can turn the knob and they will go up and stay there?? To go down you have to turn the knob to off and again they move but stay down and probably all the way to touching the bottom molding as if in park position?? If that is the case, not sure internal lube will help. If not the case, then I don't quite understand what is happening and this theory may not be the cause.
On the vacuum wiper motors, there is a small valve mechanism in a chamber on the front of the motor. The valve cycles back and forth to redirect the vacuum to each side of the paddle. It relies on the wipers getting to a certain point at the top and bottom of sweep and then an off center spring flips the mechanism. It also is dependent on the cable from switch being adjusted properly and pulling the slide valve on top to full on and off positions.
It sounds as if that flipper mechanism is not working -- possibly gummed up but also it has a spring mechanism and a fiber or plastic piece which could have broken. If that looks OK, it could be if the drive cables to the side wiper blade mounting pieces are incorrect or the wiper blades are misadjusted on the stem splines so they are hitting something before it reaches full sweep. Either of those could prevent the motor from making it to the point where it can flip the valve to go down.
You can remove the motor and open the chamber to check out the mechanism. You should be able to manually turn the paddle piece and watch the mechanism flip back and forth. If it does then I would look at the cable and arm adjustments. If it does not and is not gummed up then time for a Ficken rebuild or another motor.
I don't have a 52 assy but here is a prewar and a V8 motor. The valve mechanisms work the same in switching the vacuum but are physically different. Yours should be similar to one of them.
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On the vacuum wiper motors, there is a small valve mechanism in a chamber on the front of the motor. The valve cycles back and forth to redirect the vacuum to each side of the paddle. It relies on the wipers getting to a certain point at the top and bottom of sweep and then an off center spring flips the mechanism. It also is dependent on the cable from switch being adjusted properly and pulling the slide valve on top to full on and off positions.
It sounds as if that flipper mechanism is not working -- possibly gummed up but also it has a spring mechanism and a fiber or plastic piece which could have broken. If that looks OK, it could be if the drive cables to the side wiper blade mounting pieces are incorrect or the wiper blades are misadjusted on the stem splines so they are hitting something before it reaches full sweep. Either of those could prevent the motor from making it to the point where it can flip the valve to go down.
You can remove the motor and open the chamber to check out the mechanism. You should be able to manually turn the paddle piece and watch the mechanism flip back and forth. If it does then I would look at the cable and arm adjustments. If it does not and is not gummed up then time for a Ficken rebuild or another motor.
I don't have a 52 assy but here is a prewar and a V8 motor. The valve mechanisms work the same in switching the vacuum but are physically different. Yours should be similar to one of them.
Attach file:
(76.11 KB)
(55.43 KB)
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