The neutral safety switch was damaged and needed to be repaired or replaced. It was leaking vacuum and had a damaged upper slide channel. Decided to try to repair this 650 (non-tilt with 4-speed hydramatic gearbox).
First picture shows the damaged upper slide channel:
Here is all taken apart and cleaned:
Fitted a piece of stainless steel cut from a steel putty knife:
Here is a picture testing that the slider will move freely before applying JB-weld:
Applying JB-weld several times in small layers and carefully grinding the excess away:
Finished with JB-weld and removing the excess:
Testing with the slider (grove on slider was filled with JB-weld as well):
And with the mounting plate temporary fitted:
After that it was time to repair the vacuum valve. Basically the problem with it was that the rubber cup type seal was tired and didn't reach the bottom.
Easiest solution was to fit a small washer between the rubber cup type seal and the plunger:
After that it was to apply vacuum grease in the vacuum valve and regular grease in the neutral safety switch for the slider to move freely and then assemble it all. The picture shows all parts used and two washers, only used one and had an extra spare. The switch has been painted black. Painting is off course not necessary as it wont be visible anyways, but I like to do it that way:
For some strange reason I didn't take any picture of the assembled switch, but I know you all know what it looks like anyways.
JB-weld used was the 4-6 hours slow drying kind. It was applied over a few days to get it right. The washer was a special order from Russ together with the vacuum grease.
Have tested the vacuum valve and it holds the vacuum and when moving the gear selector into drive the vacuum goes to the parking brake and releasing it. The electrical switch is working as intended and the rear white light is turned on when the gear selector is moved to reverse. Takes a bit of trial and error to place the neutral safety switch in the right position and it does help to have the front seat out of the way...At least for a 6 foot 2 inch 230 pound Swedish guy!
Hope this will help anybody in saving a few bucks instead of buying a neutral safety switch.
Vacuum grease is a lubricant with low volatility and is used for applications in low pressure environments. Lubricants with higher volatility would evaporate, causing two problems: They would not be present to provide lubrication. They would make lowering the pressure below their vapor pressure difficult.
It's expensive stuff too. I picked up a few tubes, and use it on the NSS vacuum valve repairs. I also include it with the thin washer when I ship them to people.
why are their two washers in the picture ?
I see, I got the washer & grease from Russ in the mail other day. This morning I pulled the NSS out to repair it & the first attempt would not hold Vacuum. So I texted Russ & he said to clean all the parts well and try again. On my second try I learned you must reattach it very strong to make it work & it did. I have to say I found it very difficult to get the bolt on the left side of the NSS back on, I tried & tried and finally got it back on.In my defense, I'm a big guy & its not easy to get under the dash. You can't see the hole & the brake is in the way.
O sure now you tell me ! LOL
You can only bend the tabs once or twice, before they crack on you.
Did anybody tried to reproduce this thing with a 3D-Printer? It probably would be worth to try...