Face-lift lumbar support control.
02-12-2009, 06:42 PM
#1
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Face-lift lumbar support control.
Mark sent me one of his spare solenoids for the seat lumbar support. I took it apart and found out that the orange caps fail to seal the holes. The springs are too weak. I would try to find some stronger springs and test it in a seat.
<img src="http://pictureposter.audiworld.com/80919/dsc_037423.jpg">
<img src="http://pictureposter.audiworld.com/80919/dsc_037423.jpg">
02-12-2009, 07:14 PM
#3
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And the o-rings Tozo? What is their purpose in life? The new unit has the same spings and caps...
only the o-rings and the armature is different. Could there be leakge around the o-rings?
Mark
Mark
02-12-2009, 07:21 PM
#5
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Yes, a slightly bigger O-ring should do the trick.
I will send the valve back next week. You need to test it again and put the bottom (dump side) is water. If it bubbles then the orange caps leaking. If not, but still loosing pressure, then the O-rings leak. You can submerge the whole valve in water after you unplug the power. I can imagine that the plastic ends warp over time and the O-rings are not thick enough anymore.
02-12-2009, 07:39 PM
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WRT a stronger spring. Is it the spring that provides all the positive pressure or is it the...
pressure in the inflated bladder that really augments the sealing pressure of the spring? I imagine it is the spring that initially snaps things shut but then positive pressure keeps it there.
To summarize my prior "guessing", it is either the o-ring, the rubber cap, or deforming of the armature, or some combination of the three that is causing the leak. Lubriction except in extreme cases is likely not an issue.
Your look at this serves to confirm that there is likely not one common failure point. Yes?
Mark
To summarize my prior "guessing", it is either the o-ring, the rubber cap, or deforming of the armature, or some combination of the three that is causing the leak. Lubriction except in extreme cases is likely not an issue.
Your look at this serves to confirm that there is likely not one common failure point. Yes?
Mark
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02-13-2009, 06:32 AM
#8
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If this is a 12V device, couldn't you just replace it with...
two of these? <a href="http://www.grainger.com/Grainger/items/6JJ52">Solenoid Valve</a>
Maybe overkill, but I doubt it would ever fail again, assuming it would work at all.
Maybe overkill, but I doubt it would ever fail again, assuming it would work at all.
02-13-2009, 06:33 AM
#9
Into the water
At 12 volts in clear tap water, the entire assembly could go right in for a bubble check.
Use a battery for the power source insted of the battery charger ;-) No sense taunting!
There won't be shorts, and there is no hazard to the operator. Water is not a very good conductor really.
The assembly will need a good drying after, but it will need that tested under power or not.
Electricity and water do mix!
Use a battery for the power source insted of the battery charger ;-) No sense taunting!
There won't be shorts, and there is no hazard to the operator. Water is not a very good conductor really.
The assembly will need a good drying after, but it will need that tested under power or not.
Electricity and water do mix!