I have a 1991 300GD non turbo.
I have purchased an 87 300D turbo car with 140,000 miles on it.
(I got the car at auction for $800 and it had the Trap Ox still on it. It was real sluggish. I called Mercedes emailed them a copy of the recall from 91 and they said bring it in. They replaced the trap ox with the special pipe then installed a New turbo and complete exhaust system from front to back All free!) I like free.
Anyway back to the project: I intend on swapping the 2 engines.
The 87 runs beautifully but it has the #14 head.
The 300GD N/A has the #18 turbo head.

So as well as swapping the engines I will be swapping the heads, using the #18 head on the turbo motor and taking the #14 head (since it has no cracks or leaking) and using it on the non turbo. Then place the newly "crafted" turbo motor in my 300GD.

Upgrades that I and considering/collecting for the swap.:
New higher capacity water pump as used in the 606 motors (direct bolt on).
New full gasket set including head, oil filter, etc...
As the G has no oil cooler and the turbo motor does, add an oil cooler.
Since I am removing the head shall I put in a new timing chain?

Unknowns and things to do while the engine is out:
Is an intercooler necessary?

I intend on removing the diesel computer and run it mechanically.

Though the vacuum is fine should I replace the vacuum pump anyway?

I have a brand new injection pump made for the 350SD that I could swap for the existing pump.

I am keeping the G transmission, Is it difficult/practical to pull just the engine and leave the tranny?

That is just the initial list of things that come to mind.
Suggestions ideas greatly appreciated.

Thanks
Mark

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91 300GD SWB with transplanted 87 OM603 turbo motor