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Actual Purpose Of This Check Ball ? Aisin A340H


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69sixpackbee
New User

Apr 28, 2016, 9:22 AM

Post #1 of 4 (1305 views)
Actual Purpose Of This Check Ball ? Aisin A340H Sign In

Aisin A340 series transmissions.
Particular vehicle:
1990 Toyota 4x4 with A340H

Can anyone fully describe the function of this particular check ball & plastic cage with spring?


It is the one that resides inside the casting underneath the valve body.(or above it if you are looking at it inside the vehicle)
I need to understand it's function and the ramifications of the absence of the light tension extension spring in the cage assembly. It is quite possible that I failed to put the spring back into the cage before I placed it back in. I dropped the VB to install a shift reprogramming kit over the weekend and for the life of me I cannot remember if it is in there. The trans works flawlessly with nice firm shifts now. I completely rebuilt this A340H last winter (about 10,000 miles ago) and with the advent of a newly transplanted 3.4 to replace the paltry original 3.0, I want to insure it will live behind the new mil. I just rebuilt this engine completely and it runs like a raped ape!
Thanx in advance for the help!

Bud


gsferraro
Enthusiast

Apr 28, 2016, 4:56 PM

Post #2 of 4 (1287 views)
Re: Actual Purpose Of This Check Ball ? Aisin A340H Sign In

Hello,
That check ball and spring, is an anti-drain back valve. All pieces need to be installed because the checkball needs to sit up against the hole in the valvebody, if the spring is missing, its possible for the torque converter to drain overnite which may give a delay engagement. All toyota and lexus use this drain back valve. Gary


69sixpackbee
New User

Apr 28, 2016, 9:25 PM

Post #3 of 4 (1277 views)
Re: Actual Purpose Of This Check Ball ? Aisin A340H Sign In

I was leaning towards that conclusion. Thank you, Gary, for clearing it up!
The truck had absolutely no engagement problems whatsoever so I might not have left it off after all. I figured the weight of the ball itself would be sufficient to seal it with gravity and the spring is just redundancy. I have had cars in the past that exhibit some sort of TC drain back. Chrysler 727 Torqueflites come to mind. They were notorious for that condition once the front pump bushing started to wear.
Thanx again!

Bud


(This post was edited by 69sixpackbee on Apr 28, 2016, 9:26 PM)


gsferraro
Enthusiast

Apr 29, 2016, 3:00 AM

Post #4 of 4 (1266 views)
Re: Actual Purpose Of This Check Ball ? Aisin A340H Sign In

Your welcome, thanks for stopping by. Gary






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