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It was my 'A' series engine that laid a real, thick, blue smoke trail, every time I deaccelerated then accelerated, until that uncle taught how to replace the very worn and broken valves!!![]()
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The problem here was that the valve stem rubber seals would become hard and would start riding up and down on the valve stem, instead of staying in the recess designed to hold them in place. On my van, I used to lay a smoke trail deliberately, by doing what you describe, if someone was sat too close behind me.






