hi my 1975 240D W115 just smokes a bit too much i think and its not regular blue type smoke but black it smokes when its idling too
i set the injector pump timing at 23 Degrees BTDC and i dont quite know what to to except to replace the diaphragm but before i do that is there anything i can do also is it possible to do a burnout on a car like this not that i want to do it or anything just curiosity i wouldn't treat a car like this thanks

jeremy

If you are not going to do it, you don't need to know.

Black smoke would indicate too much fuel/ fuel not being burned
properly.
Is fuel consumption up?rough idle? clogged air filter?

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

My Volvo 240d diesel smoked black all the time when it got old.

Low compression; engine shot, pistons loose in cylinders.

Junk yard took it.

Check your compression.

It (Volvo)had 200K on it. They had VW enignes. Not so good.

I think Mercedes engines are better however from what I read.

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1982 300SD

If your IP has an pneumatic Governor the problem could be the Diaphragm as you suggested (I believe there is 2 threads in Diesel Discussion about this maybe more in the vintage section). The Diaphragm gets stiff with age.
Unfortunately it is around $200 for a new Diaphragm and you need to be carful changing it as there are shims that go in I believe it is 2 different places (better to find one of the threads and contact the Member who messed with his).

Due to the cost of a Diaphragm you might want to check the other things that can cause smoke first. Other than a dirty Air Filter my first thoughts are Injectors or poor compression.

Now that I am thinking about it I believe one of the previous Threads was yours?

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84 300D, 82 Volvo 244Gl Diesel

My 82 Volvo Engine billowed gray smoke when starting at idle and the Odometer only showed 148,000.
I was able to overhaul the Short Block only becaue I located a source of made in Brazil Pistons for $45 each.
Because it is a VW built Engine it has a lot of parts in common with a VW Rabbit.
As it turns out in Brazily the make the complete VW Rabbit Cars.
Brazil Bosch also makes Spray Nozzles for the Rabbit.

If I could have found another Volvo Diesel; but with an automatic transmission out here were I live I would have bought it. (What few were selling at the time seem to be an East Coast item.)
Fixing my Mercedes has been way more work and trouble in the 1 1/2 years I have owned it than fixing the Volvo in all of the time I have had it since 1992.
Except for the double Disc Front Calipers the rest of the car is made like a regular car; front struts w/rack and pinion suspension and a regular rear end.
It is comparing an Apple to an Orange but the Volvo still is a good car for me and is my Daily Driver.

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84 300D, 82 Volvo 244Gl Diesel