[Syty] What is TV valve lifter rod?

[Peter]

To all who replied, thank you.  Please read on--the solution is interesting.
   
  The shifting problem was fixed exactly as section 7A1-58 described in the main S-10 manual (not the SyTy supplement).  It had nothing to do with the TV cable adjustment or the cable becoming unhooked where it enters the transmission.  The manual does not give much detail.
   
  As most of you know, the TV cable controls the hydraulic pressure.  As I understand it, GM does not want anyone to destroy the tranny by driving with a broken or disconnected TV.  The tranny would think the engine was idling and would have such low pressure that it would slip badly.  So they have a safety mechanism attached to the TV lever inside the transmission.  This is a small rod, maybe 1mm diameter and a ball directly above the TV link pivot point.  If the rod is allowed to move too far because the cable is disconnected or broke, the ball blocks the "exhaust" port of the valve, causing full, safe, transmission pressure, even at idle.  (Exhaust port is not to be confused with engine exhaust.)
   
  That rod had dropped down and was "stuck".  If you look directly above the TV pivot and springs you can see the rod and the ball up in a hole.  Pull/push it free and push it back up so the ball does not block the port.  It is spring loaded and will normally stay there.  As a test, if you pivot the linkage too far, you will see the rod fall back down again allowing the ball to move.
   
  Why did I get so lucky to be the only one it happened to?  At least it was in the manual.
   
  Best regards,
   
  Peter
   
  
DOlivares <seravilo at netzero.net> wrote:
          I don't know about that "exhaust" part, but I've been in enough of those Transmissions to know about that delicate TV-Lifter mechanism, which is actually only "delicate" when you're inside messing with the valve-body or various front-mounted valves/wiring with the pan OFF... jiggling things around the dipstick area.  Once you button-up the pan, that S-shape bend at the end of the Bowden-type TV-Cable really cannot work its way out of the li'l hole in the Lifter-Arm's lever, provided you set it up right and adjust the 'Cable properly.
   
  Of course, if you never had the pan off in the first place-- and didn't ABUSE the TV-Cable by twisting it or jamming it in-and-out with undue, ape-like force-- you probably don't have to worry about its being disconnected from that Rod-end or the cable breaking.  That twisted-steel cable is tough as railroad tie and you really have to WORK to kink it!  Breaking or fraying the thing would require TOOLS and deliberate bad intentions.  You just need to make sure you have the TV-Cable Bracket properly mounted to the manifold/TB and then do the throttle adjustment of said 'Cable by the book!  I have the feeling you're doing the "mashing-down" of the gas pedal part, but you're FAILING to do the CRITICAL MECHANICAL RESET of the 'Cable itself, which is primordial and requires deliberate effort... along with a narrow pair of pliers... needle-nosers come to mind....
   
  Well, did it work?
   
  D.O.   
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  ----- Original Message -----   From: Peter 
  To: syty 
  Sent: Tuesday, January 03, 2006 2:26 AM
  Subject: [Syty] What is TV valve lifter rod?

  

  Gentlemen,
   
  While working on the throttle body last night, I disconnected the TV cable.  When I reconnected and took a test drive, the shift points are delayed and extremely hard.
   
  Section 7A1-58 of the service manual says something about the "TV valve lifter rod" dropping down to allow the TV exhaust ball to seat if the cable is broken, disconnected, or extremely out of adjustment.  I think this is what happened.
   
  It then says if the transmission pan is removed, it should  be possible to pull down on the TV exhaust valve lifter rod and let the springs return the rod to its normal up position.
   
  No pictures or other mention of the TV valve anywhere that I can find.
   
  Has this happened to anyone else?  If so, any tips on correcting it?
   
  Thanks,
   
  Peter Albrecht
    
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