C3 (1972) Problem - Wiper Door Cover Pinching on Close
I am having 2 problems and need help. I've spent hours and hours searching the TDB archives and hours and hours and hour working on the car. I suspect the problems are likely related and are as follows:
1.When I turn off the wipers, the wiper door cover shuts immediately and pinches the wipers before they park (their sticking out once the door shuts). I've played with the positioning on the Safety Valve so that's not it. As a matter of fact, I can make sure the switch doesn’t close, but the wiper door still does. I went as far as to move one of the headlight relay valves to the wiper, but the same problem persists.
2.The pneumatic wiper door control (next to the wiper override switch) doesn't work either. With the car on and the wipers off, the pneumatic wiper door control does nothing when pulled. When the wipers are running it causes the wiper door to immediately close on the wipers where ever they happen to be in their travel.
Parts Replaced:
https://www.forums.ncrs.org/showthre...+door&uid=7932
Here is some vacuum data taken at cluster side (not the reservoir side) of the Bypass Check Valve (shown in the attached picture). The small hose was pulled on the Bypass Check Valve and the gauge was plugged right into the nipple of the valve.
Dscf3224 (1008 x 756).jpg
Engine Running 18 in Hg
Engine Off 18 in Hg @ t = 0 seconds
Engine Off 8 in Hg @ t = 20 seconds
Engine Off 0 in Hg @ t = 75 seconds
You can see the vacuum leaks off 10 inches in 20 seconds – is this excessive? In an archive post I read earlier it said one should be able to open and close the headlight doors a few times before the reservoir is depleted. I can only open them once, then the reservoir is depleted and I can’t even close them.
Question:
Does my logic make sense that the reservoir is leaking too fast? How can I test (or have I already). Is a replacement available? Next steps or suggestions?
1.When I turn off the wipers, the wiper door cover shuts immediately and pinches the wipers before they park (their sticking out once the door shuts). I've played with the positioning on the Safety Valve so that's not it. As a matter of fact, I can make sure the switch doesn’t close, but the wiper door still does. I went as far as to move one of the headlight relay valves to the wiper, but the same problem persists.
2.The pneumatic wiper door control (next to the wiper override switch) doesn't work either. With the car on and the wipers off, the pneumatic wiper door control does nothing when pulled. When the wipers are running it causes the wiper door to immediately close on the wipers where ever they happen to be in their travel.
Parts Replaced:
- New Inline Vacuum Filter http://www.corvette-paragon.com/p-34...se-filter.aspx
- New Vacuum Bypass Check Valve http://www.corvette-paragon.com/p-35...uum-valve.aspx
- New Vacuum Control Valve (Safety Valve) http://www.corvette-paragon.com/p-34...rol-valve.aspx
- New Wiper Solenoid (on Tach) - eBay #250398965435
https://www.forums.ncrs.org/showthre...+door&uid=7932
Here is some vacuum data taken at cluster side (not the reservoir side) of the Bypass Check Valve (shown in the attached picture). The small hose was pulled on the Bypass Check Valve and the gauge was plugged right into the nipple of the valve.
Dscf3224 (1008 x 756).jpg
Engine Running 18 in Hg
Engine Off 18 in Hg @ t = 0 seconds
Engine Off 8 in Hg @ t = 20 seconds
Engine Off 0 in Hg @ t = 75 seconds
You can see the vacuum leaks off 10 inches in 20 seconds – is this excessive? In an archive post I read earlier it said one should be able to open and close the headlight doors a few times before the reservoir is depleted. I can only open them once, then the reservoir is depleted and I can’t even close them.
Question:
Does my logic make sense that the reservoir is leaking too fast? How can I test (or have I already). Is a replacement available? Next steps or suggestions?
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