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The real issue with the 606 engines is that the glow plugs are longer then the 617 and 603 plugs, and they look thinner but I've not measured any up to verify that hunch
MB has a real problem with them sticking in the heads though and I believe if they used some antisieze on the threads at the factory some of the problems would be lessened but the fact that the carbon builds up inside and they get stuck will always be something that will be present.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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