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Originally Posted by SVXsnubb
I checked it again. The solenoid C is normaly open. I can blow air thru when it is not energized but close when energized. The steel-ball in the front is free from the seat when it is not energized. When energized the "piston" push
foward the ball to the seat.
My SVX has center differential.
There is one thing I wonder about. For those cars with center diff.
Is the center clutch activated when the car is driven at a nornal speed on a plain road? If not the solenoid drains the pilot pressure in a such case (according to the schematic drawing)
It is of cause quite different for cars without center differential.
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Thank you Lars your presence in this thread is appreciated.
All the C solenoids I have examined do not incorporate a ball as some of the normally open 1, 2, and 3 solenoids do. Some makes of the latter appear to have the armature directly facing onto the valve seat whereas others incorporate a ball. It could be that the same applies in respect of solenoids A, B and C.
I intend obtaining a sample C solenoid locally from a used JDM transmission so that we can compare notes.
Edit P.S. I have checked with a specialist solenoid supplier and it appears that there are four different C solenoids listed for the 4EAT transmission. I am also advised that there are errors in Subaru parts lists which further complicate matters. Investigation continues.
The centre LSD clutch would not normally be operated on a plane straight road as you say, when power distribution is 36.4% front, 63.6% rear. However the PWM signal is available, and comes into operation to improve driving stability when required under various driving conditions.
Compliments of the season, Trevor.