Quote:
Originally Posted by funola
I would not call it a design flaw. The glow plug has gotten longer and smaller in diameter with newer engine designs but the way they seal via the flare is the same. I think the problem is due to improper installation when the glow plugs are changed, due to debris between the sealing surfaces or improper torque. This allows carbon to breach the sealing surface and pack the area between glow plug body and head cavity. The smaller diameter and longer glow plugs are just more prone to breaking when packed with carbon and ham fisted mechanics/ DIY try to remove them using bad techniques.
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More to the point - the OM606 is a DOHC design with the prechamber centered in the cylinder head. Arguably a better design than the SOHC design with the offset prechamber of the OM603 that preceded it - better breathing and better / more complete combustion. As a result that glow plug has to be pretty long to actually get to the prechamber, it isn't right up against the side of the head like the earlier engines were.
Just be glad it isn't the 2-piece spark plug that Ford used in the mid 2000's V8's. THAT was a stupid design!