clinto
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Ok, in the approximately 8 million threads here on SS concerning wiper motors, the general consensus is overwhelming that the plastic bodied air powered wipers suck.
Why do they suck more than the metal ones?
Let me explain....
I have about half a dozen plastic ones and every single one of them has the same problem: When you open the valve and provide pressure to them, they swing to the right and won't return. Pushing the red button rarely gets them moving back and forth on their own, it simply lets the arm come back to the left and it stays there until you release the button....... and the whole process is repeated.
So I took one apart and it is the picture of simplicity. The air pressure pushes the piston down the bore, until it uncovers an air passage, which allows air to travel and get behind the piston, thus reversing course. When the piston gets to the other side, the process is repeated.
All of mine have great seal-once that piston is bottomed out at one end, with full air pressure, I can barely move the manual level to manually wipe the windshield So I know the piston is sealing to the wall..........
So what is it about the metal ones that is so much better? Do they have larger air circuits that don't get clogged? Are clogged air passages the culprit in my plastic ones?
Discuss!!!
Why do they suck more than the metal ones?
Let me explain....
I have about half a dozen plastic ones and every single one of them has the same problem: When you open the valve and provide pressure to them, they swing to the right and won't return. Pushing the red button rarely gets them moving back and forth on their own, it simply lets the arm come back to the left and it stays there until you release the button....... and the whole process is repeated.
So I took one apart and it is the picture of simplicity. The air pressure pushes the piston down the bore, until it uncovers an air passage, which allows air to travel and get behind the piston, thus reversing course. When the piston gets to the other side, the process is repeated.
All of mine have great seal-once that piston is bottomed out at one end, with full air pressure, I can barely move the manual level to manually wipe the windshield So I know the piston is sealing to the wall..........
So what is it about the metal ones that is so much better? Do they have larger air circuits that don't get clogged? Are clogged air passages the culprit in my plastic ones?
Discuss!!!