This pertains to a 40 series Landcruiser. Having just done this and not having found a coherent post about how to do it (i.e., part here and part there and no part anyhere), I thought this might be helpful for others who knew as little as I did before I started. Adam, from Chula Vista, CA, and owner of multiple HJ47s, helped me out so I give him credit for helping (don't know his mud name).
First photo: windscreen cowling with wiper motor cover shown (but off). Can see the outline where it was on the screen for the last 35 years.
Cover off, revealing the washer motor attached by four screws also (two top ones seen here). Take those off. Can let it kind of dangle on the hood/bonnet. The white electric connection has been disconnected from the wires that come ultimately from the fuse box. That connection is out of view.
Now go to the wiper arm. Here it is as you see it on your 40 series.
Flip the cover off and you can see the bolt holding the arm assembly on. Take the bolt off. As with almost everything on the cruiser, use a 10mm wrench. Wiggle/pull the wiper arm off the splined "nipple."
Here the bolt's been taken off and the rubber washer. The nut (dirty), metal and rubber washers (painted partly white here against the cowling) are still left to be removed.
I'll add the next sequence of photos and process after this.
First photo: windscreen cowling with wiper motor cover shown (but off). Can see the outline where it was on the screen for the last 35 years.
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