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MB Doc,
Thanks, that confirms what I heard from Metric Motors, that the p/c bore on the new heads is shallower than the original heads. However, I have talked to a couple of folks now that just purchased new OM603.96 prechambers for their heads (on OM603.96 engines, obviously), and said that cured the problem. Do you have any TSB or other documentation with more info on the 603.97x parts being the "recommended" fix by Mercedes? My local dealer had NEVER heard of this problem, let alone any type of solution...!
Thanks again,
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