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在调整气门间隙、校对供油时间（汽油机是点火时间）和安装高压油泵（汽油机是分电器）时，都要找内燃机Ⅰ缸压缩行程的上止点。但有关内燃机的教材、资料中对找Ⅰ缸压缩行程上止点的说法是，“顺时针撬转飞轮，使飞轮上止点记号与飞轮壳上刻线对正时即为Ⅰ缸压缩行程上止点”
When adjusting valve clearance, proofing fueling time (gasoline engine is ignition time) and installing high-pressure oil pump (gasoline engine is distributor), it is necessary to find the top dead center of compression stroke of cylinder I of internal combustion engine. However, the internal combustion engine teaching materials, data to find compression cylinder Ⅰ compression point on the claim that “clockwise pry flywheel, flywheel top mark and flywheel housing engraved line is the cylinder Ⅰ compression stroke Stop point ”