Quote:
Originally Posted by Dionysius
This is a large thread. I am discovering the transmission vac control. The VCV is acting like a switch. There is no nice linear ramp of inverse inches of Hg v acc pedal position as I monitor line to the transmission modulator.
I pulled the VCV and opened it. 2 screws and the top comes off. There is a coil spring on the throttle input shaft which displaces a brass slug. There is a nut on a long sided nut. My question is can I adjust this to restore the linearity of control. Is there any data out there as to what the right performance curve (inverted In Hg V pedal depression %age) should be. If this has been discussed on here where is it at.
Any help much appreciated.
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Well, I DID crack open the one I had with a switch like action....
Inside, there is a spiral-spring that the throttle-shaft 'winds up. The outer end is attached to a diaphragm and a valve.
--The assembly was sticking, the spring was 'winding up' then suddenly the movement was transferred to the diaphragm...
Dismantling the whole thing, cleaning everything including the tiny metering orafice inside the diaphragm restored smooth operation and I was able to re-fit and set the VCV correctly. It has been working faultlessly since....
--I would not adjust anything, as we're not sure exactly what does what. Just dismantle the whole thing clean it all and make sure nothing is broken or sticking when the device is operated....
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Alastair AKA H.C.II South Wales, U.K. based member
W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.
W114, 1975 280E Custard Yellow,
-Great above decks
needs chassis welding--Really will do it this year....
