70 wiper adjustment procedure
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
70 wiper adjustment procedure
I've been working on cleaning up a few items on my 70, getting the wipers adjusted correctly being one.
Just noticed today, the positioning of the wiper stop makes the park adjustment impossible per the factory procedure. The stop is located much further to the passenger side than shown in the illustration. The tip of the left wiper rests on the stop, no way to get it to sit 1" below the stop. My first question was whether some prior owner had moved the stop. Doesn't appear so, found a link to a photo from Willcox which shows the same positioning.
http://repairs.willcoxcorvette.com/1...-nozzle-tubes/
This appears to make the wipers sit higher than expected when parked, sometimes interfering with the wiper door. In my case, the wiper door sometimes rests on the right hand squirter tube. If the blade were parked about 1/8" or 1/4" lower, there would be plenty of room.
I have adjusted the screw on the wiper arm to turn the tips of the blade inward, meet spec to avoid hitting the trim.
Has anyone else experienced something similar?
Just noticed today, the positioning of the wiper stop makes the park adjustment impossible per the factory procedure. The stop is located much further to the passenger side than shown in the illustration. The tip of the left wiper rests on the stop, no way to get it to sit 1" below the stop. My first question was whether some prior owner had moved the stop. Doesn't appear so, found a link to a photo from Willcox which shows the same positioning.
http://repairs.willcoxcorvette.com/1...-nozzle-tubes/
This appears to make the wipers sit higher than expected when parked, sometimes interfering with the wiper door. In my case, the wiper door sometimes rests on the right hand squirter tube. If the blade were parked about 1/8" or 1/4" lower, there would be plenty of room.
I have adjusted the screw on the wiper arm to turn the tips of the blade inward, meet spec to avoid hitting the trim.
Has anyone else experienced something similar?
Last edited by BBCorv70; Apr 29, 2018 at 01:34 PM.
Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,373
From: Westminster Maryland
Hi bb,
Here's a photo of what I believe is the typical location of the stop.
Just to the right of the linkage rod that operates the wiper door safety switch mounted on the firewall.
Regards,
Alan
You can see the rod passing through the firewall.
The 2 places in the AIM that I see it listed seem to indicate it's located nearer the wiper motor. transmission.. but I don't think it is.
Here's a photo of what I believe is the typical location of the stop.
Just to the right of the linkage rod that operates the wiper door safety switch mounted on the firewall.
Regards,
Alan
You can see the rod passing through the firewall.
The 2 places in the AIM that I see it listed seem to indicate it's located nearer the wiper motor. transmission.. but I don't think it is.
Last edited by Alan 71; Apr 29, 2018 at 03:04 PM.
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Hi bb,
Here's a photo of what I believe is the typical location of the stop.
Just to the right of the linkage rod that operates the wiper door safety switch mounted on the firewall.
Regards,
Alan
You can see the rod passing through the firewall.
The 2 places in the AIM that I see it listed seem to indicate it's located nearer the wiper motor. transmission.. but I don't think it is.
Here's a photo of what I believe is the typical location of the stop.
Just to the right of the linkage rod that operates the wiper door safety switch mounted on the firewall.
Regards,
Alan
You can see the rod passing through the firewall.
The 2 places in the AIM that I see it listed seem to indicate it's located nearer the wiper motor. transmission.. but I don't think it is.
Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,373
From: Westminster Maryland
Hi bb,
I just took another look... the nut plate used to mount the 'stop' is flat riveted to the cowl so the 'stop' NEEDS to be towards the right from where it's shown in the AIM.
I don't have the wiper arms right now so I can't check what the position of the 'stop' does to the way the wiper arms 'park'.
Regards,
Alan
I just took another look... the nut plate used to mount the 'stop' is flat riveted to the cowl so the 'stop' NEEDS to be towards the right from where it's shown in the AIM.
I don't have the wiper arms right now so I can't check what the position of the 'stop' does to the way the wiper arms 'park'.
Regards,
Alan
Last edited by Alan 71; Apr 29, 2018 at 04:17 PM.
Drifting
Joined: Nov 2002
Posts: 1,787
Likes: 261
From: Blue Bell PA
2018 C3 of Year Finalist
I remember running into this same predicament a couple
Of yraers ago. My 69 has the stop on the passenger side also.
Sorry I can’t remember what I did but I was able to get it low
Enough to clear everything.maybe the linkage is 1inch below
At the center. Where they say the stop is? Good luck. Mine works fine
Except the washers won’t shut off they stay on when the wipers run.
A job for another day.
Of yraers ago. My 69 has the stop on the passenger side also.
Sorry I can’t remember what I did but I was able to get it low
Enough to clear everything.maybe the linkage is 1inch below
At the center. Where they say the stop is? Good luck. Mine works fine
Except the washers won’t shut off they stay on when the wipers run.
A job for another day.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Not that this matters:
All I know is that when I am setting the wipers. I make sure of two things.
1.) On the wiper door cars that they go down far enough so I have NO interference with the wiper door and that also I am using the correct style blades..
2.) When the wipers are out at there farthest point. I make sure that the blades cannot hit the stainless trim.
Then obviously I make sure that the blades do not hit each other where they can come close to each other.
And on the 1969-1972 Corvettes...I also make sure that the right wiper arm...when set...allows the vacuum switch for the wiper door to also work as designed.
Lastly...I also make sure that the bushings at the adjustment area for the wiper arms is in good condition and no excessive wear on them due to they can cause all types of problems when adjusting the arms.
DUB
All I know is that when I am setting the wipers. I make sure of two things.
1.) On the wiper door cars that they go down far enough so I have NO interference with the wiper door and that also I am using the correct style blades..
2.) When the wipers are out at there farthest point. I make sure that the blades cannot hit the stainless trim.
Then obviously I make sure that the blades do not hit each other where they can come close to each other.
And on the 1969-1972 Corvettes...I also make sure that the right wiper arm...when set...allows the vacuum switch for the wiper door to also work as designed.
Lastly...I also make sure that the bushings at the adjustment area for the wiper arms is in good condition and no excessive wear on them due to they can cause all types of problems when adjusting the arms.
DUB
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Wiper arms are reproductions. Wiper holders and blades are low profile. I get pretty close to where I want to be, maybe a bit more tweaking. If I adjust the angle of the blade, turning the screw on the wiper arm, so that it misses the trim by 3/4" (factory spec), I am pitching the top of the blade inward. This may cause the right blade to contact the left blade sooner when parked? Right blade parks a bit higher in this case? Maybe adjust the right arm to allow the blade to come closer to the trim without contacting?
I noted a dimension given which specs the distance between wiper arm transmissions. No idea how this would be adjusted, I don't recall much room for movement.
Good suggestion on the bushing, I'll check it out. Thanks.
I don't see any way to set the wipers using the factory procedure, wiper stop is nowhere near where the illustration shows it. Impossible to get the 1" drop of the left tip below the wiper stop.
I noted a dimension given which specs the distance between wiper arm transmissions. No idea how this would be adjusted, I don't recall much room for movement.
Good suggestion on the bushing, I'll check it out. Thanks.
I don't see any way to set the wipers using the factory procedure, wiper stop is nowhere near where the illustration shows it. Impossible to get the 1" drop of the left tip below the wiper stop.
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
You need to physically pick up the left blade/arm and position it 1" below the wiper stop. Then adjust the right blade/arm. Once that is done, you physically pick up the left & right blade/arm and reposition them to the Top Side of the stop.
Last edited by Revi; Apr 30, 2018 at 08:08 PM.
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Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,373
From: Westminster Maryland
Hi BB,
???
Does it have something to do with the 'park' position in the wiper motor or perhaps ensuring that the right side arm can close far enough to have the right side transmission lever compress the plunger on the safety valve to signal that it's o.k. to close the door?
Regards,
Alan
???
Does it have something to do with the 'park' position in the wiper motor or perhaps ensuring that the right side arm can close far enough to have the right side transmission lever compress the plunger on the safety valve to signal that it's o.k. to close the door?
Regards,
Alan
Last edited by Alan 71; May 1, 2018 at 10:14 AM.
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
3. Position Toe of LH Blade 1.00 below the Park Stop Bracket.
6. Position Blades on upper surface of Park Stop Bracket.
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Drifting
Joined: Oct 2009
Posts: 1,939
Likes: 199
From: Palm Bay Florida
Mark