Author Topic: Another "slams into gear" problem...  (Read 3488 times)


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Another "slams into gear" problem...
« on: March 26, 2007, 01:16:16 PM »

Let me start by saying that I am new to the forum and to the autostick (which I really like). I have the classic problem; slams into R and L. I have read everything posted on this fourm on the subject. Let me give you the basics and what I have done. Hopefully some of you can help me with this. I have a 60 type 1 and am a pretty decent mechanic (my own estimation). I have worked on them for many years (not a novice).

     - 68 type 1 autostick 44,000 origional miles, 100% stock, un-touched, and rust free. I aquired the car after 22 years in storage.
     - Removed engine, replaced air seals, fuel lines, ATF lines, all vacum lines with OEM wire wrapped, C&R carb, changed oil, comp test (120 lbs X4 all the same!), complete tune-up. Started it up for 2 min, changed oil again, and again ect.... The engine runs great under all conditions and loads. Made all adjustments with idle set 850-900 rpm.
     - Checked vacum system for leaks, none anywhere. The AS system seems to function perfectly. It shifts smoothly under all conditions except into R or L while standing still. I have tried adjusting the control valve. If I adjust it to the point where it will not slam in to R or L then the release time for 1 and 2 is extensive (20-30 seconds or not at all).
     - Torque converter has to be good, it will go almost 80 mph...
     - Things I do not understand:

         1. I can disconnect the small vacum line from the carb and and leave it hanging. It makes no difference in this problem (yes it is connected to the correct place on the back of the origional stock carb) but I have tired it on the vacum advance port too. Still no difference. I can only detect the slightest of vacum from the port.

         2. Servo free play adjustments. I have tried this but someone had apparently also done it in the past. I set it us as best I could IAW Haines with no effect. Why is this procedure so convoluted in the AS? MT freeplay is straight forward. This should be too. Do any of you have any alternative procedures?

I have to think it is a servo adjustment problem at this point. Perhaps too much travel overcomes the mechanical advantage within the servo??? I would appreciate any advice wisdom any of you have.

Thanks, Tom


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Another "slams into gear" problem...
« Reply #1 on: March 27, 2007, 12:59:59 AM »
Hiya Tom,

Welcome to the group!

The"slams into gear" syndrome is a pretty common one judging from the number of folks who have complained about it.  Usually the problem boils down to the fact that the small vacuum hose from the control valve has been hooked up to the wrong vacuum port on the carburetor.  Wrong, in this case, meaning that the vacuum signal signal is way too strong.  Even adjusting the control valve in this situation will have little effect on the shift action due to the strength of the vacuum.  The correct vacuum signal has to be drawn from above the butterfly.

However it sounds as if you MAY (check out the above info anyway to be sure your setup does comply) have your vacuum hooked up correctly.  While you are correct in that the clutch servo could be the culprit, I would be inclined to check out two other areas first.

Check out the "front end" of your control valve.  Where the small vacuum hose from the carb hooks up.  It might be possible that there is an obstruction or an impediment inside the control valve which is causing a jerking shift action.  The valve discs inside the control valve should move freely and the diaphragm should be intact and pliable.  The insides of these things are usually pretty clean, even in cars with extensive mileage.  But it's quite possible that a car which has sat for over twenty years could have a few parts that are a bit "sticky".

Also take a look at the vacuum reservoir tank just outboard of the control valve and under the rear fender  You mentioned no vacuum leaks.  Does that go for the tank also?

70 AS Bug


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Another "slams into gear" problem...
« Reply #2 on: March 27, 2007, 10:21:07 PM »
Hi Tom,
if You take the small vacuum hose off My carby,
it takes about 15-20 seconds for the clutch to work....
with the small hose attached its almost instantanous...
depending on where the control valve is adjusted...

sounds like a control valve OR shifter contacts not working

Lee   68Autobug  Australia
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