Can someone point me to the idle speed adjustment on the 1979 240D?
Post a pic possibly? I'm assuming this will not machanically raise the idle but add more fuel to bring up the rpm's. Like a mixture kinda.

That's going to depend on what set up you have. There are instructions in the FSM, but too large a file to post here, PM me with an e-mail address, I'll send it to you.

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83 SD

84 CD

On the inboard side if the IP you will see a long adjusting bolt that has a lock nut that mechanically controls the idle.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Just to make sure we're all on the same page, are you talking about the adjustment under the hood on the IP, or the knob on the dash that allows you to adjust the idle while you're driving?

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

He's talking about the ball ended link under the hood. Loosen the locknuts and turn it like a turnbuckle to shorten or lengthen it.

I think Stevo has the right spot for him. Loosen the 14 mm locknut and hold onto it while you turn the screw CCW.

Didn't 240Ds come with an idle adjustment knob right behind the steering wheel?

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-Typos courtesy of my mobile phone.

Yes, but the idea is to set the normal idle at the correct speed and use the knob to turn it up for cold weather warm ups.

Yes, that is the correct adjustment.