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The BMW Range
3 Series
E46
Top Overhaul M43 E46
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<blockquote data-quote="jarance" data-source="post: 413360" data-attributes="member: 21"><p>Worn out piston ring is one of the cause of low compression. Low compression happen when there is a leak when the piston is moving up. the leak can be due to worn out piston rings, improper sitting of the valves seat, worn out valve/seats, worn out or incorrect setting of the hydraulic lifter/tappet or blown gasket.</p><p></p><p>Yes, performance will be "restored" if the worn out part are replaced but it will not be 100%.</p></blockquote><p></p>
[QUOTE="jarance, post: 413360, member: 21"] Worn out piston ring is one of the cause of low compression. Low compression happen when there is a leak when the piston is moving up. the leak can be due to worn out piston rings, improper sitting of the valves seat, worn out valve/seats, worn out or incorrect setting of the hydraulic lifter/tappet or blown gasket. Yes, performance will be "restored" if the worn out part are replaced but it will not be 100%. [/QUOTE]
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