What is the purpose for the rubber/plastic spacer washer that's supposed to go between the upper windshield frame and the hard top sheet metal visor?

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May 10, 2021
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Clovis, California, USA, Earth
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The stock sheet metal visor was riveted into the stock holes in the fiberglass top and now when installed there's a 1/4" or so gap. Even with the washers there will still be a gap all along the top of the windshield. Seems odd.
 
Once you take them apart, they never go back together quite the same.
 
That washer is just there to give the top of the screen and the metal 'visor' a bit of space for vibration. If they were bolted directly together there would still be vibration, but it would rub the paint away and lead to squeaks and rust. On my nas 83 FJ40 there was even a thin clear plastic washer between the fender washer on the bolt and where it touched the 'visor'. My '84 LX had that too. My '76 fj40 did not, however. It only had the rubber spacer washer.

I've been very fortunate in my life to have had three 40s where I was the first to remove the top. On all three I keep all the hardware and carefully reinstalled it exactly as I'd removed it. All three never squeaked or leaked any more than they did from new.
 
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That washer is just there to give the top of the screen and the metal 'visor' a bit of space for vibration. If they were bolted directly together there would still be vibration, but it would rub the paint away and lead to squeaks and rust. On my nas 83 FJ40 there was even a thin clear plastic washer between the fender washer on the bolt and where it touched the 'visor'. My '84 LX had that too. My '76 fj40 did not, however. It only had the rubber spacer washer.

I've been very fortunate in my life to have had three 40s where I was the first to remove the top. On all three I keep all the hardware and carefully reinstalled it exactly as I'd removed it. All three never squeaked or leaked any more than they did from new.
That makes total sense. Some pictures I've seen only have two, one on each outside one, some have two on the outside ones and the middle one is snugged up tight. So if I got some hard plastic or rubber washers that fit I don't need to worry about having the unobtanium OEM ones, as long as they perform the vibration absorbing task?
 
I found this picture of the bolts called out for attaching the front of the roof to the WS frame, 90119-06086. I assumed the nylon washer went on the outside, but you are saying 90202-06040 washer goes between the top and WS frame? I honestly don't know. I just purchased some M6 nylon washers from amazon for these. The 90119- bolts appear to be hex head bolts with a captured steel flat washer.

Edit - I see where city racer sells an aftermarket washer and they do go between the roof and WS frame.

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When you put things together, was the windshield knob

View attachment 4142835

loose or not installed?

If the knob was tight it would not allow the top of the windshield to move outward and shrink the gap.

There is a tube over the thread on that knob that sets the depth. The spacer between the cowl and windshield plays into it. There is also a weatherstripping piece between the top of the windshield and cap.

Is that tube there? The spacer there and in good shape? Same with the weatherstripping on the top?
 
That makes total sense. Some pictures I've seen only have two, one on each outside one, some have two on the outside ones and the middle one is snugged up tight. So if I got some hard plastic or rubber washers that fit I don't need to worry about having the unobtanium OEM ones, as long as they perform the vibration absorbing task?
Yes. That's what I did on my 43 because it was missing them. It works just as it should now. I used hard rubber drain plug gaskets I got at NAPA and they seem to work perfectly.
 
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