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On 1 Sep 2006 at 0:20, Arkady Mirvis wrote: > The hose attached to the vacuum unit has on an opposite end a > nylon T-fitting attached which is then connected to 2 ports on the air > distribution box. One (the upper port) has a restricting orifice in > it, while the other doesn't have any restrictor. These connections to > the air box do puzzle me. I can't understand the reason why two ports > are used. Is this a reason why the trans behaves the way it does? Or > maybe T-fitting is attached to wrong air distribution box ports? I've never been able to figure out this system either. If anyone can, I'd love to hear it. > The trans had its strainer cleaned, 3 liters of new Dexron II > installed. The vacuum unit is also new, right from the box. Bentley > shows that the vacuum unit can be adjusted. But why, when and how? No > word is there. What the adjustment is for? I am sure the list expert > have the answers and their help is appreciated. The adjustment gives the right relationship between manifold vacuum and AT internal clutch engagement for your engine. While I'm not familiar with any other cars which require such an adjustment, many other cars come with an internal adjustment (an internal pin, available in different lengths, chosen for that particular AT/engine/vacuum modulator. In most cases, you just replace the vacuum modulator and use the same pin, but sometimes you have to adjust the pin length, or get a different pin. For our cars, the adjustment is not optional. If you replace the vacuum modulator you MUST do the adjustment proceedure as outlined in the Bentley. The replacement modulators do NOT come preadjusted. BTW, did you get the RIGHT vacuum modulator? The 72-3 type 3s use a different one from the earlier cars. If you just got an aftermarket VM from your local FLAPS, it's probably the early style. The OEM ones are marked with the correct VW part # as well as a color band. I believe the late one you need is the C version. (The A version was the early FI one, while the B version was used on type 3s with AT and carbs.) -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~