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<blockquote data-quote="jeallen01" data-source="post: 1108912" data-attributes="member: 176704"><p>IIRC, DMF's were introduced, initially on diesels but now also on many petrol-powered cars, was/is to protect the engine crankshaft from very heavy shock-loadings when the clutch is suddenly engaged - probably more relevant on the higher power turbo (i.e. for extra low revs power) engines that are now very common.</p><p></p><p>FWIW, many years ago, the clutch on my "warmed up" 1600cc (petrol) Astra got "damaged" when I did somewhat of a "racing start" (was in a hurry that day!) and then failed a few miles later - but the damage to the crankshaft only became apparent several months later when, one morning on the way to work, the engine noise gradually increased to the point I had to pull over and call the breakdown service for a 50 mile lift back home (was working away at the time)!</p><p></p><p>I knew the damage sounded "terminal" and so bought another car - and later stripped the Astra engine to find that the crankshaft had completely broken across a big end or main bearing (can't remember which) because of a stress fracture caused by the above shock-loading event that then progressively turned into the breakage.</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1108912, member: 176704"] IIRC, DMF's were introduced, initially on diesels but now also on many petrol-powered cars, was/is to protect the engine crankshaft from very heavy shock-loadings when the clutch is suddenly engaged - probably more relevant on the higher power turbo (i.e. for extra low revs power) engines that are now very common. FWIW, many years ago, the clutch on my "warmed up" 1600cc (petrol) Astra got "damaged" when I did somewhat of a "racing start" (was in a hurry that day!) and then failed a few miles later - but the damage to the crankshaft only became apparent several months later when, one morning on the way to work, the engine noise gradually increased to the point I had to pull over and call the breakdown service for a 50 mile lift back home (was working away at the time)! I knew the damage sounded "terminal" and so bought another car - and later stripped the Astra engine to find that the crankshaft had completely broken across a big end or main bearing (can't remember which) because of a stress fracture caused by the above shock-loading event that then progressively turned into the breakage. [/QUOTE]
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