Re: BigKev
Posted by BigKev On 2022/10/11 13:19:08
So trying to troubleshoot my Trico Mag-Numatic Washer pump, which I rebuilt back in 2009. It pumps, but it pumps anemically, but the bigger problem s that the coordinator never engages. I thought the problem was with the coordinator, but it is not, as I can get that to work if I put a vacuum on it separately.
So based on the letters in the picture below, here are the connections:
A) Engine Vacuum Source
B) Vaccum output on the solenoid
C) Vaccum input on the controller
D) Vaccum output on the controller for the coordinator
E) Water outlet for wiper jets
On the underside, there is a hose connection between the bottom of the pump and the bottom of the controller, which the fluid passes through.
I couldn't find and theory of operation on how the pump works. But this is what I am seeing.
With the car running and the washer button not pressed, I have a constant 20psi of vacuum on B.
When I press the washer button, the vacuum drops to zero on B and then comes back after the button is released. The water does start to flow from D, but not with much gusto.
Before, I was seeing vacuum being pulled on E when the button was pressed and released. I do not see that anymore. It's always at zero.
I was surprised that B always had a constant vacuum when not pressed, I would have thought that would have been only when the solenoid was active. But I confirmed this on another until as well.
I think that constant vacuum has something to do with keeping the liquid drawn up into the pump the against the spring pressure. Then when the solenoid cuts off the vacuum (when the button is pressed), the spring presses out the liquid through the hose on the bottom side and up through the controller and out to the jets.
So that I can understand.
But then I guess my next question is then, where is the source of the vacuum for E?
Is it being vacuum created on the backside of the piston by the spring pushing the fluid out?
Perhaps there is a seal leak in the piston/housing, and that is causing the weak fluid pressure and lack of vacuum behind the piston. I remember the housing had a crack in it, which I had glued, but perhaps that has failed.
Please let me know if the general theory of operation of the unit sounds correct.
There is very little info on how the pump actually functions.
Attach file:
Magnumatic.jpg (267.97 KB)
So based on the letters in the picture below, here are the connections:
A) Engine Vacuum Source
B) Vaccum output on the solenoid
C) Vaccum input on the controller
D) Vaccum output on the controller for the coordinator
E) Water outlet for wiper jets
On the underside, there is a hose connection between the bottom of the pump and the bottom of the controller, which the fluid passes through.
I couldn't find and theory of operation on how the pump works. But this is what I am seeing.
With the car running and the washer button not pressed, I have a constant 20psi of vacuum on B.
When I press the washer button, the vacuum drops to zero on B and then comes back after the button is released. The water does start to flow from D, but not with much gusto.
Before, I was seeing vacuum being pulled on E when the button was pressed and released. I do not see that anymore. It's always at zero.
I was surprised that B always had a constant vacuum when not pressed, I would have thought that would have been only when the solenoid was active. But I confirmed this on another until as well.
I think that constant vacuum has something to do with keeping the liquid drawn up into the pump the against the spring pressure. Then when the solenoid cuts off the vacuum (when the button is pressed), the spring presses out the liquid through the hose on the bottom side and up through the controller and out to the jets.
So that I can understand.
But then I guess my next question is then, where is the source of the vacuum for E?
Is it being vacuum created on the backside of the piston by the spring pushing the fluid out?
Perhaps there is a seal leak in the piston/housing, and that is causing the weak fluid pressure and lack of vacuum behind the piston. I remember the housing had a crack in it, which I had glued, but perhaps that has failed.
Please let me know if the general theory of operation of the unit sounds correct.
There is very little info on how the pump actually functions.
Attach file:
Magnumatic.jpg (267.97 KB)
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