The right windshield wiper on my '72 interfers with the cover, i.e., it does not park in a low enough position. I played with all of the adjustment allowed at the wiper motor and it is not enough. Besides, at this point the linkage from the wiper arm to the motor is nearly a straight line. For my next attempt I plan to try to remove the wiper arm from the trunnion and rotate it a spline or two in an attempt to get more angle between the actuation arm and the pushrod to the wiper motor. I recently purchased this car and this condition was pre-existing. I am guessing the wiper arms and wipers are correct. Any other suggestions to solve this problem will be highly appreciated. Mike McCormick
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Re: Windshield Wiper Cover Interference
Wiper arm has a master keyway allowing it to mount to the drive spline in only ONE physical orientation. You cannot remove and re-orient it as the earlier cars from the 50-60 era allowed.
I suggest that, perhaps you've NOT played with ALL the adjustments as you said.... The sweep of the RH and LH arms is separately adjustable via attaching bolts on the crank arm drive plate (back side of WSW motor in the cowl area). Also, the RH arm controls when the wiper door closes by its contact to the wiper door vacuum control valve when it comes to a final park/rest position.
The wiper door vacuum control valve has enlongated mounting holes that allow the rest position of the arm to be 'fine tuned'. You remove the wiper door cover, loosen the vac control valve's mounting bolts and move it up/down, as required, to set the arm's final rest/park position. -
Re: Windshield Wiper Cover Interference
Jack,
Thank you for the information.
This job started as r & r of the wiper door vacuum interlock valve (the one under the right wiper arm). The old one leaked badly and caused the door to rise after the engine was stopped. I have a Mityvac and traced the leak with it. I realized that the valve could hold the right wiper "up", so I have adjusted the valve so that it just allows flow between the red and white ports when the wipers are parked, thus putting a minimum of spring pressure on the wiper arm. I have not played with the sweep adjustment yet. Perhaps between that adjustment and the linkage adjustment on the push rods I can reach some happy medium. By the way, what length wiper blades was the car originally equiped with? I cannot find that info in my Chassis Service or Overhaul Manuals.
Again, thanks for the help!Comment
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Re: Windshield Wiper Cover Interference
Trico 16-inch blades were used. Originals from the era differ ever so slightly from what's available off-the-shelf from Trico today and that difference lies in the geometry of the upper bridge. This can be important to your car since the original arms had brass squirter tubes attached and on the RH arm the squirter tube goes up/over the wiper blade (the LH arm's squirter routes below/in-front of the arm). Bottom line, the extra material on the top/bridge of today's service replacement blades can interfere with the squirter tube, cause the blade to not seat fully flush with the glass and 'catch' on the bottom edge of the wiper door.
BTW, original Trico 16-inch blades are plentiful from scrapyard cars from that era. So, getting 'correct/original' blade holders and filling them with fresh rubber is relatively easy....Comment
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