As it not only smoked blue (oil) but covered the cove in nasty hard to remove Diesel Smoot every two weeks , and also always had wetness inside the turbo's snout , I was thinking that yes , the turbo seals were shot and allowing it to pass engine oil into the intake .
One of the things I checked each time I checked a turbo on a junker was : remove the black plastic intake 'U' boot and wipe my finger 'round inside the turbo's snout . most have a fair good bit of oil there plus of course , how muc radial and axial play the shaft has , along with does it spin freely or bind ? .
They're supposed to have minute amounts of axial play as the shadt runs in an oil bath but axial play s a big no - no .
So when I found a really clean inside and dry turbo on a junker that matched my '84 , I grabbed it and so far it seems O.K.with less smoke .
Your black smoke as the engine spools up to it's ' Sweet Spot ' is correct & normal ~ before you change anything else , remove the injectors and have them pop tested , most indie shops and Diesel Fuel Injection shops will have a pop tester and will do it while you wait .
DO NOT leave your injectors anywhere out of your direct site for even one moment ! .
If they're mis - matched or have even one that doesn't spray right on spec. or drools , spits visible droplets instead of a super fine fog like mist , consider replacing them all .
It only takes one bad injector to screw things up , sharply reduce power and kill your fuel economy .
Do a one tank fuel economy check , don't drive gently , just see what you're getting and go from there .
-Nate
Rob Asked :
>
> Nate,
>
> Nice job on the turbo replacement.
>
> Question, was the old turbo leaking oil internally, so it was making the
> blue smoke?
> The 'new' turbo is another used one, or rebuilt?
>
> I get a puff of what seems like black smoke (could be brown) when I'm
> hard on the pedal, as when merging on the freeway, right when the engine
> revs to the highest point before shifting. I'm guessing there's more I
> don't notice, and so I'm wondering about the injectors too.
>
> Rob
> '85 MB 300D
> Garden Grove, CA
> ==
>
>
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