Electric wiper sweep/park irratic

Has anyone had the issue with the sweep of the wipers not going the full distance on the first one or two times than going a little further the rest of the times (consistently), then when turning them off when the reverse they park too low? This is with the drivers side arm adjusted so it won't go off of the A pillar (barely), when parked the wiper isn't parallel with the lower windshield trim, slightly downward. I've tried 3 different cams on the wiper shaft and still have the same results. All parts have been cleaned and lubricated, only thing I did notice was a little out of round wear where the wiper motor cam attaches to the control arm, but with the cam I'm using I don't think (not sure) that it's the issue. It seems to me the park switch (internal behind the cover) isn't shutting the motor off soon enough. It's controlled by a little bent up tab on the gear that really offers no adjustment as far as I can tell, I did try. If it was any type of wear issue with the mechanisms I would think the motor wouldn't "push" the wiper arm far enough or "pull" it down enough when parking. This is with a dry windshield, in my experience wet will only make the problem worse by reducing friction which will increase the sweep. I'm about to remove the park wheel on the gear and just park them manually, how often will the wipers get used? Never if I'm lucky!

That's one thing I set when I rebuild wiper motors - the park angle.







Is the cam assembled properly?
Motor away from you wiper arm facing you....
Large thin spring/wave washer goes on the arm shaft,
Then the eccentric spring slides over the shaft,
Then the large eccentric cam with the R facing you, and the L toward the wiper motor
Next the plastic eccentric linkage cam,
Next the snap ring or clip to hold the eccentric all in place. Parts should be lubricated with a good quality grease.
When the motor is all assembled, before you put it back in the car, run it a bit, then stop it. Now wire it to "park". When it stops or is parked, the arm should be 13 degrees off horizontal, or if the motor armature is held perfectly level the arm should stop or park 13 degrees off a line drawn through the armature.

Thanks billd, it's assembled as you mentioned and there's a dished washer that goes on before the retaining clip that I've tried dish in and out. The puzzling thing to me is the inconsistent sweep, why short on the first couple than long. BTW, this motor came w/the project and is NO where as nice as the ones you do! Adjusting the angle park is something I'll look at What controls that? Is it as simple as removing the large gear from the worm drive and indexing it so the rear control shaft is as you've described?


Edited by 70amcpwr - Apr/17/2013 at 7:20am

They operate fine, just park too low. I'm concerned if I move the arm one more spline on the shaft it'll send the wiper onto the trim. As it is now wiper travel is within an inch of the trim with a dry windshield.














Edited by 70amcpwr - Apr/17/2013 at 12:24pm

Now that sounds like the answer, I'll give that a try. Thanks!