Vacuum Dashpot (check valve) green in color Vacuum modulator (located at side of transmission) The VCV and Transmission vacuum modulator are no longer available from Mercedes-Benz.Ĭhange over valve (located on top of valve cover) This part breaks regularly! The transmission vacuum system for the Mercedes 240D is as follows: Remember, if the vacuum is to high the transmission will want to shift to quickly, if the vacuum is to low, the transmission will not want to shift at all. If need be, isolate the leaking sections by disconnecting them and capping off at the location. Even the smallest leak can cause havoc on how the transmission shifts. Vacuum System: Must be in perfect working order. Do not use "P" as you will not get an accurate reading. Check fluid level with gear selector in "N". to make sure engine and transmission are at full operating temperature. Transmission Fluid: Drive car for at least 15 min. The following check list will help determine what might be going wrong. These symptoms should be checked at once to avoid potential damage to the transmission. Or perhaps, the transmission is not wanting to shift at all or shifts very late. Or perhaps there is flaring between particular shifts. Transmission quickly progresses through gears (1-4) from a stop and does so a bit sloppily. Any part of the vacuum system that is failing can and will cause disruption to the transmissions ability to shift properly There are several things to check, and most of them are vacuum related. If your W123 diesel has shift issues, there is a very good chance that the transmission is just fine.
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