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Originally Posted by dmorrison
The amount of airswitches on your engine, as far as I can tell, depends on the year it was produced, ie emission standards. And the model car. The 1983 240D has 2 airswitches. One for EGR the other for tranny downshift. My 1982 has 3. What each one is for, I have not figured out, because it runs fine. I know I have a EGR system so that is 1. but I have a bowden cable so the other ones are not for downshift.
This discussion has to be geared for either 240D with the 616 engine and the 722.1 tranny. Or the 300 turbo diesel with the 617 engine and the 722.2 tranny. Then we have the 300 nonturbo to discuss.
Dave
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I am trying to install a '82 300CD engine into a '83 240D. It looks like I will try to use the 240D transmission first, as it has no obvious problems. I just don't understand the reasons for all the variations in terms of downshift.
The 240D has no obvious downshift control (vacuum line off one valvecover switch)? The 300CD has a cable. The valvecover of the 300CD engine has two vacuum switches, one triggering at idle, one triggering at full throttle. I won't be using EGR (I'll hook up some hoses, but I want to make sure it doesn't work), so possibly one of the two switches will connect to the 240D tranny for downshifting....
That's the only issue I haven't worked out in advance yet - the vacuum routing, including the fuel shutoff. Wish me luck, any suggestions are welcome.
