F6L912风冷柴油机在安装气缸盖时要检测活塞顶隙，其值为1．0mm～1．2mm，且同一台柴油机各缸的活塞顶隙应相同，以保持柴油机运转平稳。活塞顶隙过大，缸压减小，使起动性变差，功率下降，影响油耗和排放。顶隙过小则使柴油机工作粗暴，损伤机件，甚至使活塞须与气门发生干涉 F6L912 air-cooled diesel engine to be installed in the cylinder head to detect the piston top clearance, the value of 1.0mm ~ 1.2mm, and the same piston cylinder piston tank top should be the same in order to maintain a stable diesel engine. Piston overcapacity, cylinder pressure decreases, so startability deteriorates, power decline, affecting fuel consumption and emissions. Too small a clearance causes the diesel engine to work rudely, damaging the parts, and even making the piston interfere with the valve