My WS wipers have never worked correctly once I installed the aftermarket WS frame 10 years ago. I have just dealt with it. I originally placed all the blame on the aftermarket WS frame being out of tolerance, but some of the blame also should go the supposedly "NOS" wiper motor I bought from Collins Brothers.
To recap, my wiper linkage binds up. When I rebuilt the Jeep, I installed all new aftermarket linkage. It all broke and fell apart due to the binding. I changed motor, still bound up. I built a custom short linkage out of fine all thread and spherical rod ends. This worked perfectly, but the added weight/mods I had to perform to the aftermarket linkage to get it to work weakened the pivots, and it all fell apart.
So, I drilled out the mounting holes on the wiper body, left these bolts loose, and installed used/good shape OEM lnkage. This works, but it is kind of funny watching the motor "saw back and forth" across the WS frame. Works fine, doesn't bind up, but very shoddy.
After 10 years, countless cross country trips with marginal wiper performance, I finally had enough, decided to try and fix this issue one last time.
I saw that "certifiablejeep" was parting out some CJ's recently, so I took the opportunity to buy a used OEM motor, used OEM linkage, and the "upgraded" intermittent wiper switch stuff:
The short linkage is missing a bushing, but my currently installed OEM linkage set up is intact and in good shape. It looks like this short linkage bound up because the arm is bent where the missing bushing belongs. Perhaps the rusty WS frame caused a cave in and the wiper linkage bound up? Who knows, but thanks again "certifiablejeeper"!!!!!!!!!!
On my present set up, the only way to get the linkage not to bind is to position the motor like so:
Slotted hole:
Middle hole, you can't even see it:
Far outer hole:
And, this is with the holes in the wiper body drilled/sanded/filed/bored out. So, definitely not right, way out of whack.
And of course, the in cab cage down legs rear their ugly heads again!!!!! The DS down leg partially covers the hole that the wiper motor plug passes through:
So, out comes the little pick, remove the wires from the old plug, able to get it out in one piece:
Used the same technique to take apart the "new to me used motor" wire plug.
Comparing the supposedly "NOS Collins Brother's" wiper motor with the used original motor I got from "certifiablejeeper":
Used on the Right, CB on the left. Besides the lack of the "Made in Japan", and the other ink writing on the CB motor, the CB motor wiper arm is different then the OEM arm.
It is hard to see in the picture, but I took out my caliper and started measuring. There is a difference between the two arms. Not much, but I only need 1 or 2mm to get this tow work correctly.
With the arm not being correct, it alters the geometry/throw of the short link. It is pushing/pulling this link too far, causing binding. With the old motor loose, the motors movement on the frame would keep the linkage from binding up against the first pivot, and tearing up the WS frame.
It is not a drastic difference, but this is 95% of my problem!!!!!!!!!!!!!!!!