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240 Keep blowing overdrives

smeha

smeha

Tranny Whisperer
Joined
Mar 3, 2017
Location
California
My AW70 keep blowing overdrive solenoid.
Atf freshly flushed at MAX on hot side after driving 25 min, going through selector and wait 1-2 min.
The only weird thing is that when I go replace overdrives on warm trans, it start pouring slowly from one of the holes, build up pressure? 2 ebay MTC ones and 1 ipd so far.
Any thoughts?
Thank you
 
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i'd just do the bypass mod to one of the solenoids or buy the ipd bypass plate. Also the fluid flowing from the hole when replacing it is normal.

PS bumping after an hour will not really help your post.
 
esmth said:
i'd just do the bypass mod to one of the solenoids or buy the ipd bypass plate. Also the fluid flowing from the hole when replacing it is normal.

PS bumping after an hour will not really help your post.
Click to expand...

I have the bypass that drilled from the original overdrive, but i'm looking for the answer why they keep blowing and how to fix the feature. Thanks
 
Ahh....so you're fighting what I just fought. Chances are the solenoids are fine, but the orings with them aren't right. I just ordered a pair of orings FROM THE DEALER, both were too large to fit in the grooves so they would walk out when you installed it. I ended up finding something close from Napa, put those in, leak was gone. My old one looked like it had fluid from under the cap as well, but it was ust spraying around with the airflow in the area.
 
gsellstr said:
Ahh....so you're fighting what I just fought. Chances are the solenoids are fine, but the orings with them aren't right. I just ordered a pair of orings FROM THE DEALER, both were too large to fit in the grooves so they would walk out when you installed it. I ended up finding something close from Napa, put those in, leak was gone. My old one looked like it had fluid from under the cap as well, but it was ust spraying around with the airflow in the area.
Click to expand...

so what you saying is that not the caps were blown, but the o rings? Oo
Every overdrive i got was with the new o rings...
 
BUT, did the orings actually fit in the grooves or were they too large on the diameter side of things? I replaced just the orings on my working solenoid, leak got worse. Took my spare solenoid, matched some to it, installed, leak was fine. Removing the old solenoid with the new orings, they had shifted during install since they were both 1/8-3/16" too large to stay in the grooves.
 
gsellstr said:
BUT, did the orings actually fit in the grooves or were they too large on the diameter side of things? I replaced just the orings on my working solenoid, leak got worse. Took my spare solenoid, matched some to it, installed, leak was fine. Removing the old solenoid with the new orings, they had shifted during install since they were both 1/8-3/16" too large to stay in the grooves.
Click to expand...

Past 2 sets of o-rings if i recall were the same that came with overdrivers:
1 inner yellow ring perfect fit.
1 outer black little to tight actually, definitely not large.
Thoughts? I have a spare set of 2 black o-rings from IPD. Should i give it a try and replace them today on the current "blown cap" overdrive?
 
So it's definitely a blowing cap. Around o rings when I took off it was fairly dry, and when I squeeze the rubber around cap, it would poor a bit of ATF. I will put bunch of sealant and see for now. Thoughts on why I keep blowing overdrive caps? 3 so far.
 
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Since I put that one back and seal it. I will order new cheap one from ebay. Planing to take a rubber cap and put lots of marine epoxy on top of plastic and wire. Then I will replace current one and snap pics.
 
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