According to FSM it's possible heat the ring gear with a torch and get it of the flywheel.
So i heated the ring hear with a torch for a couple of minutes, kept a wet rug on the flywheel and then pounded the flywheel with a rubber hammer while the edges of the ring gear were resting on 4 2x4s. Results are NONE.
And it was the best idea i could come up with.
What am i missing?

Did you evenly heat it?

Full disclosure: I don't have experience with doing this on a diesel or a Mercedes.
I have done it on an old Ford. I used an oxycetylene torch, and it fell right off. Turned it over and put it right back on. New teeth, voila! I did not use a heat sink. you definitely want to keep the torch moving. Any discoloration of the metal is affecting the temper.

getting the ring gear off is not as easy as installing one. I recall someone telling me they busted the existing (defective) gear off, probably a deep cut with a dremel tool then a whack with a cold chisel Putting it on requires chilling the flywheel and heating the new ring gear then mating them up quickly before the temperatures equalize. I believe you need an oven to heat the ring gear, a torch can't distribute heat evenly and it might warp

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i did do it rally evenly and i used a 2 lbs hammer instead of a rubber one this time and i got it, thanks

The old flywheel turned out to be balanced 0 so i put the new one in the freezer for overnight i'll put the ring gear in the oven tomorrow.

Thanks a lot, guys.

Might try dry ice. That could get the flywheel down close to -100F potentially.

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A plain propane torch is fine, heat the ring evenly ( you won't get anywhere near dull red. ) then drop it on. Might have to tap a bit to get the ring to seat. FW can be at room temp.

How hot to make the ring? Well it is one of those " that looks hot enough deals " , 250 F is probably enough. Steel expansion rates are known so we should be able to calculate this.

Change in Radius of Thin Circular Ring with Temperature

200F difference makes for ~0.02'' or whatever it was it worked. I had to give the ring some good rubber hammer whacking to sit it perfectly even but it was really easy comparing to the removal as it was already said.
Thanks again.