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On the other side of the pump is the electromagnet that engages it and also holds it from moving (on the ratchet wheel)
If you live the pawl it should allow you to move that slider manually to make sure it's not jammed up or anything.
"When the motor is turning, the ratchet arm is always moving back and forth with the cam wheel but it's not ratcheting the gear ahead, when the washer button is pressed, the electromagnet moves the other arm up and allows the ratchet arm to engage the gear to start turning, the ratchet arm then pulls it around and pumps the pump.
When it makes one full turn the magnet arm drops back into the off spot and it stops the ratchet arm from engaging the gear again."
Thanks for the tips, I am able to manually move the rachet arm, and turn the gear, and it didn't seem stuck. The cam gear doesn't look damaged but maybe it is worn enough that the driver shaft is slipping out? That's the only other thing I can think of
OR
The driver shaft itself is not rotating (can it actually be in a state of not rotating if the wipers are running?). I will have to check that with the wipers on later.
Originally Posted by Mooser
On the other side of the pump is the electromagnet that engages it and also holds it from moving (on the ratchet wheel)
If you live the pawl it should allow you to move that slider manually to make sure it's not jammed up or anything.
"When the motor is turning, the ratchet arm is always moving back and forth with the cam wheel but it's not ratcheting the gear ahead, when the washer button is pressed, the electromagnet moves the other arm up and allows the ratchet arm to engage the gear to start turning, the ratchet arm then pulls it around and pumps the pump.
When it makes one full turn the magnet arm drops back into the off spot and it stops the ratchet arm from engaging the gear again."
IIRC, the 4 star cam wheel is always turning while the wipers are running and the follower is moving back and forth with it all the time
The pin on the right is moving back and forth following the star cam wheel on the other side all the time
The arm that goes over and into the actual piston of the pump is held to the right (you can see that little tang against the right side of the ratchet gear shaft, it rides on the gear when installed) That arm is help over to the right when the pump is not being used so the follower pin just moved back and forth in that slot on the arm not doing anything.
When the pump is engaged, the electromagnet releases the ratchet arm and it starts turning around and lets that arm start to pump the pump
M
This is the tab under the ratchet wheel that releases the arm to pump the pump for a full revolution and then gets moved back to the right where it's held until the button is pushed again
I'm thinking that when you say the arm doesn't move you're trying to move it with the mechanism all in place, there's a fairly strong spring pushing against that arm inside the pump and the pin is inside a track on star wheel so it's not really free to move when all together
M
So. I've taken it apart as above, and with the pump apart I'm actually able to move the rachet, drop the clip, and turn the wheel. It seems to turn freely. I'm worried now that the pin is slipping out of the 4-star cam maybe? It seems pretty tight in there though, so it's hard to believe that might be happening. If that's not happening, then I wonder if it is possible for the driver that's turning the pin to not be turning - which would mean it never moves the cam. I'm skeptical of this, but will not know until I get back out to the car again.
Originally Posted by Mooser
I'm thinking that when you say the arm doesn't move you're trying to move it with the mechanism all in place, there's a fairly strong spring pushing against that arm inside the pump and the pin is inside a track on star wheel so it's not really free to move when all together
M
It's possible the pin could be slipping out of the star wheel but it would seem unlikely. Originally I thought the pin would "find" it's way into the socket as the motor went around the first time but mine didn't. I had to park the motor and position the pin into the star wheel socket
The other pin on the slider just rides along the star wheel profile so it's pretty basic.
You'll really need to see if that wheel is turning with the motor to figure out what to look at next
M
Washerpump Wierdness
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