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How mechanic diagnose piston rings is KO!
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<blockquote data-quote="Supachip" data-source="post: 281381" data-attributes="member: 2530"><p>Compression test should be easily carried out in all workshop using compression gauge. Just plug the gauge into the sparkplug hole one by one and start the engine. Compression should be around 13 to 15 bars.</p><p></p><p>Whereas if the compression is ok, normall should be the valve guide. Mechanic can check if there's loads of carbon soot at the back surface of valve stem.</p><p></p><p>Sorry, the vacuum check is only meant for checking bent valves (knocked piston).</p><p></p><p>Cheers :)</p></blockquote><p></p>
[QUOTE="Supachip, post: 281381, member: 2530"] Compression test should be easily carried out in all workshop using compression gauge. Just plug the gauge into the sparkplug hole one by one and start the engine. Compression should be around 13 to 15 bars. Whereas if the compression is ok, normall should be the valve guide. Mechanic can check if there's loads of carbon soot at the back surface of valve stem. Sorry, the vacuum check is only meant for checking bent valves (knocked piston). Cheers :) [/QUOTE]
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How mechanic diagnose piston rings is KO!