If it were only the injection pump!
These 3.5L diesels have a long and sorry history of bending their
connecting rods - probably metal fatigue. The #1 and #4 pistons are
usually affected and are no longer square to their cylinders causing the
cylinder walls to be scored. The engine surges, burps, grunts, begins to
burn oil and finally is no longer reliable. This will not be cheap to
Many of these 3.5L have been rebuilt and replaced at considerable
expense to owners. You'll find more information from a Google search.
also see: http://www.mercedesproblems.com - search for S350
Let's not go overboard here, just because it's 603 engine, and a 91 350SDL
this guy thinks every tweak and rattle on 603 is the known engine problem.
This person was explaining a surging, not the symptoms with bend rods and
scored cylinder walls!, I'm sure his question would have been more precise.
I have a 93 SD and recently rebuild the cylinder, had I blieved all the other
mechanics I would have had to replace the
I was burning oil and after I replaced the valve guides and seals my problem
I absolutly love my SD.
I suggest you find a MB shop that properly diagnoses your vacuum related engine
The problem could be several vacuum connections I can think of, just make sure
you find an independent shop that doesn't wanna rebuild your engine everytime
it tweaks or rattles.
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