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OM 352 Head Bolt Size

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Does anyone have the specs for the head bolts. Thread pitch,length, grade.....?

G Vavra
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Shank length of cylinder head bolts are 112max according to WSM.
Size is M12. Grade not provided - I would suggest they are proprietary (MB spec) bolts.

I know some models actually used studs with nuts on the top instead of bolts - early models perhaps ?
OK, just found it - before engine number 678 155. They can be replaced by bolts.
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