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Message: <blockquote data-quote="LCP" data-source="post: 207148" data-attributes="member: 2424">Overhaul... to change piston rings is quite a major overhaul job already... not only the cylinder head will have to come apart, but the pistons too, and not sure, for M50, whether this will involve taking out the all-important crankshaft... When you do your overhaul job, make sure you change whatever engine innards that is necessary (apart from the compulsory items that is part of the opening up process)... Note that depending on the extent of the damage, the cylinder walls may also need to be polished, and if there are wear or deep scratches, the only way out is to re-bore, this would entail new pistons also.</blockquote>