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Message: <blockquote data-quote="Tazza" data-source="post: 129423" data-attributes="member: 82">I work for a diesel engine rebuilder, we rebuild these engine every day. We tell every customer that we use a composite head gasket to re-tension their head bolts after 6-10 hrs of operation, be it for Kubota or Yanmar. The only one we don't touch are Shibaura/perkins as the mechanic uses a specific tensioning procedure and they are set and forget.As for danger of failing if not tesnioned, you may get lucky and have no issues, but you have a very high chance of it leaking over time if it's not done. At the end of the day, it's your call what you do, you may be lucky, and then you may get a slight leak that isn't an issue, then you may get enough of a leak to cause fretting of the head and block from the high pressure gas, or worst case, hydro lock and you then need new con rods or a block repair if it breaks a rod.We wee it all.</blockquote>