Lockup Solenoid Tutorial

[tomard]

Can someone intelligent give me, in laymans terms, what actually happens when the +12v and - are provided to the solenoid?

1) Does it restrict flow, by "plugging" the pump bore, or is it opposite, that it moves out of bore and provides more flow?

2) Once more/less flow is achieved by solenoid, how does it actually lock up the TCC ? It is by maintaining a certain pressure or some other way

 

[mikestertwo]

Can someone intelligent give me, in laymans terms, what actually happens when the +12v and - are provided to the solenoid?

1) Does it restrict flow, by "plugging" the pump bore, or is it opposite, that it moves out of bore and provides more flow?

2) Once more/less flow is achieved by solenoid, how does it actually lock up the TCC ? It is by maintaining a certain pressure or some other way

The torque converter has a floating clutch inside it that slides on the input shaft of the trans when installed. The solenoid operates a shuttle valve inside the pump. When the solenoid is activated it closes an oil exhaust port that moves the shuttle valve into the lockup position which reverses the flow of oil inside the converter forcing the clutch up against the face of the converter. This basically connects the converter housing (which is bolted to the flywheel) directly to the input shaft of the transmission.

 

[Lee Thompson]

Another way of saying it

Maybe this will help.
The solenoid is open (non / locked) It is dumping oil into pan. When it is activated (locked)--it closes and the oil that was dumping now activates the lockup valve (moves up in the bore) which redirects the fluid. Or something like that.

 

[gsgns4me]

 

[tomard]

Thanks for that info - I feel little smarter now!!